Shamusworld >> Repos - apple2/blob - src/apple2.cpp

   1 //
   2 // Apple 2 SDL Portable Apple Emulator
   3 //
   4 // by James Hammons
   5 // (C) 2005 Underground Software
   6 //
   7 // Loosely based on AppleWin by Tom Charlesworth which was based on AppleWin by
   8 // Oliver Schmidt which was based on AppleWin by Michael O'Brien. :-) Parts are
   9 // also derived from ApplePC. Too bad it was closed source--it could have been
  10 // *the* premier Apple II emulator out there.
  11 //
  12 // JLH = James Hammons <jlhamm@acm.org>
  13 //
  14 // WHO  WHEN        WHAT
  15 // ---  ----------  ------------------------------------------------------------
  16 // JLH  11/12/2005  Initial port to SDL
  17 // JLH  11/18/2005  Wired up graphic soft switches
  18 // JLH  12/02/2005  Setup timer subsystem for more accurate time keeping
  19 // JLH  12/12/2005  Added preliminary state saving support
  20 // JLH  09/24/2013  Added //e support
  21 //
  22
  23 // STILL TO DO:
  24 //
  25 // - Port to SDL [DONE]
  26 // - GUI goodies
  27 // - Weed out unneeded functions [DONE]
  28 // - Disk I/O [DONE]
  29 // - 128K IIe related stuff [DONE]
  30 // - State loading/saving
  31 //
  32
  33 #include "apple2.h"
  34
  35 #include <SDL2/SDL.h>
  36 #include <fstream>
  37 #include <string>
  38 #include <iomanip>
  39 #include <iostream>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <time.h>
  43 #include "log.h"
  44 #include "video.h"
  45 #include "sound.h"
  46 #include "settings.h"
  47 #include "v65c02.h"
  48 #include "applevideo.h"
  49 #include "timing.h"
  50 #include "floppy.h"
  51 #include "firmware.h"
  52 #include "mmu.h"
  53
  54 #include "gui/gui.h"
  55 #include "gui/window.h"
  56 #include "gui/draggablewindow2.h"
  57 #include "gui/textedit.h"
  58
  59 // Debug and misc. defines
  60
  61 #define THREADED_65C02
  62 #define CPU_THREAD_OVERFLOW_COMPENSATION
  63 #define DEBUG_LC
  64 //#define CPU_CLOCK_CHECKING
  65 //#define THREAD_DEBUGGING
  66 #define SOFT_SWITCH_DEBUGGING
  67
  68 // Global variables
  69
  70 uint8_t ram[0x10000], rom[0x10000];                             // RAM & ROM spaces
  71 uint8_t ram2[0x10000];                                                  // Auxillary RAM
  72 //uint8_t diskRom[0x100];                                                       // Disk ROM space
  73 V65C02REGS mainCPU;                                                             // v65C02 execution context
  74 uint8_t appleType = APPLE_TYPE_IIE;
  75 FloppyDrive floppyDrive;
  76
  77 // Local variables
  78
  79 uint8_t lastKeyPressed = 0;
  80 bool keyDown = false;
  81 bool openAppleDown = false;
  82 bool closedAppleDown = false;
  83 bool store80Mode = false;
  84 bool vbl = false;
  85 bool slotCXROM = false;
  86 bool slotC3ROM = false;
  87 bool ramrd = false;
  88 bool ramwrt = false;
  89 bool altzp = false;
  90 bool ioudis = true;
  91 bool dhires = false;
  92
  93 //static FloppyDrive floppyDrive;
  94
  95 enum { LC_BANK_1, LC_BANK_2 };
  96
  97 static uint8_t visibleBank = LC_BANK_1;
  98 static bool readRAM = false;
  99 static bool writeRAM = false;
 100
 101 static bool running = true;                                             // Machine running state flag...
 102 static uint32_t startTicks;
 103 static bool pauseMode = false;
 104
 105 static GUI * gui = NULL;
 106
 107 // Local functions (technically, they're global...)
 108
 109 bool LoadImg(char * filename, uint8_t * ram, int size);
 110 uint8_t RdMem(uint16_t addr);
 111 void WrMem(uint16_t addr, uint8_t b);
 112 static void SaveApple2State(const char * filename);
 113 static bool LoadApple2State(const char * filename);
 114
 115 // Local timer callback functions
 116
 117 static void FrameCallback(void);
 118 static void BlinkTimer(void);
 119
 120 #ifdef THREADED_65C02
 121 // Test of threaded execution of 6502
 122 static SDL_Thread * cpuThread = NULL;
 123 //static SDL_mutex * cpuMutex = NULL;
 124 static SDL_cond * cpuCond = NULL;
 125 static SDL_sem * mainSem = NULL;
 126 static bool cpuFinished = false;
 127 static bool cpuSleep = false;
 128
 129 // NB: Apple //e Manual sez 6502 is running @ 1,022,727 Hz
 130
 131 // Let's try a thread...
 132 /*
 133 Here's how it works: Execute 1 frame's worth, then sleep.
 134 Other stuff wakes it up
 135 */
 136 int CPUThreadFunc(void * data)
 137 {
 138         // Mutex must be locked for conditional to work...
 139         // Also, must be created in the thread that uses it...
 140         SDL_mutex * cpuMutex = SDL_CreateMutex();
 141
 142 // decrement mainSem...
 143 //SDL_SemWait(mainSem);
 144 #ifdef CPU_THREAD_OVERFLOW_COMPENSATION
 145         float overflow = 0.0;
 146 #endif
 147
 148         do
 149         {
 150                 if (cpuSleep)
 151                         SDL_CondWait(cpuCond, cpuMutex);
 152
 153 // decrement mainSem...
 154 #ifdef THREAD_DEBUGGING
 155 WriteLog("CPU: SDL_SemWait(mainSem);\n");
 156 #endif
 157 SDL_SemWait(mainSem);
 158
 159 // There are exactly 800 slices of 21.333 cycles per frame, so it works out
 160 // evenly.
 161 #if 0
 162                 uint32_t cycles = 17066;
 163 #ifdef CPU_THREAD_OVERFLOW_COMPENSATION
 164 // ODD! It's closer *without* this overflow compensation. ??? WHY ???
 165                 overflow += 0.666666667;
 166
 167                 if (overflow > 1.0)
 168                 {
 169                         overflow -= 1.0;
 170                         cycles++;
 171                 }
 172 #endif
 173
 174 #ifdef THREAD_DEBUGGING
 175 WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
 176 #endif
 177                 Execute65C02(&mainCPU, cycles); // how much? 1 frame (after 1 s, off by 40 cycles) not any more--it's off by as much as 240 now!
 178
 179                 // Adjust the sound routine's last cycle toggled time base
 180                 // Also, since we're finished executing, .clock is now valid
 181 #ifdef THREAD_DEBUGGING
 182 WriteLog("CPU: AdjustLastToggleCycles(mainCPU.clock);\n");
 183 #endif
 184                 AdjustLastToggleCycles(mainCPU.clock);
 185 #else
 186 #ifdef THREAD_DEBUGGING
 187 WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
 188 #endif
 189                 for(int i=0; i<800; i++)
 190                 {
 191                         uint32_t cycles = 21;
 192                         overflow += 0.333333334;
 193
 194                         if (overflow > 1.0)
 195                         {
 196                                 cycles++;
 197                                 overflow -= 1.0;
 198                         }
 199
 200                         Execute65C02(&mainCPU, cycles);
 201                         WriteSampleToBuffer();
 202
 203                         // Dunno if this is correct (seems to be close enough)...
 204                         vbl = (i < 670 ? true : false);
 205                 }
 206 #endif
 207
 208 #ifdef THREAD_DEBUGGING
 209 WriteLog("CPU: SDL_mutexP(cpuMutex);\n");
 210 #endif
 211                 SDL_mutexP(cpuMutex);
 212 // increment mainSem...
 213 #ifdef THREAD_DEBUGGING
 214 WriteLog("CPU: SDL_SemPost(mainSem);\n");
 215 #endif
 216                 SDL_SemPost(mainSem);
 217 #ifdef THREAD_DEBUGGING
 218 WriteLog("CPU: SDL_CondWait(cpuCond, cpuMutex);\n");
 219 #endif
 220                 SDL_CondWait(cpuCond, cpuMutex);
 221
 222 #ifdef THREAD_DEBUGGING
 223 WriteLog("CPU: SDL_mutexV(cpuMutex);\n");
 224 #endif
 225                 SDL_mutexV(cpuMutex);
 226         }
 227         while (!cpuFinished);
 228
 229         SDL_DestroyMutex(cpuMutex);
 230
 231         return 0;
 232 }
 233 #endif
 234
 235
 236 // Test GUI function
 237
 238 Element * TestWindow(void)
 239 {
 240         Element * win = new DraggableWindow2(10, 10, 128, 128);
 241 //      ((DraggableWindow *)win)->AddElement(new TextEdit(4, 16, 92, 0, "u2prog.dsk", win));
 242
 243         return win;
 244 }
 245
 246
 247 Element * QuitEmulator(void)
 248 {
 249         gui->Stop();
 250         running = false;
 251
 252         return NULL;
 253 }
 254
 255
 256 /*
 257  Small Apple II memory map:
 258
 259 $C010 - Clear bit 7 of keyboard data ($C000)
 260 $C030 - Toggle speaker diaphragm
 261 $C051 - Display text
 262 $C054 - Select page 1
 263 $C056 - Select lo-res
 264 $C058 - Set annuciator-0 output to 0
 265 $C05A - Set annuciator-0 output to 0
 266 $C05D - Set annuciator-0 output to 1
 267 $C05F - Set annuciator-0 output to 1
 268 $C0E0 - Disk control stepper ($C0E0-7)
 269 $C0E9 - Disk control motor (on)
 270 $C0EA - Disk enable (drive 1)
 271 $C0EC - Disk R/W
 272 $C0EE - Disk set read mode
 273 */
 274
 275 //
 276 // V65C02 read/write memory functions
 277 //
 278
 279 uint8_t RdMem(uint16_t addr)
 280 {
 281         uint8_t b;
 282
 283 #if 0
 284 if (addr >= 0xC000 && addr <= 0xC0FF)
 285         WriteLog("\n*** Read at I/O address %04X\n", addr);
 286 #endif
 287 #if 0
 288 if (addr >= 0xC080 && addr <= 0xC08F)
 289         WriteLog("\n*** Read at I/O address %04X\n", addr);
 290 #endif
 291
 292         if ((addr & 0xFFF0) == 0xC000)                  // Read $C000-$C00F
 293         {
 294                 return lastKeyPressed | (keyDown ? 0x80 : 0x00);
 295         }
 296 //      else if ((addr & 0xFFF8) == 0xC010)             // Read $C010-$C01F
 297         else if (addr == 0xC010)
 298         {
 299 //This is bogus: keyDown is set to false, so return val NEVER is set...
 300 //Fixed...
 301 //Also, this is IIe/IIc only...!
 302                 uint8_t retVal = lastKeyPressed | (keyDown ? 0x80 : 0x00);
 303                 keyDown = false;
 304                 return retVal;
 305         }
 306         // These are //e locations
 307         else if (addr == 0xC011)
 308         {
 309 #ifdef SOFT_SWITCH_DEBUGGING
 310 WriteLog("RDBANK2 (read)\n");
 311 #endif
 312                 return (visibleBank == LC_BANK_2 ? 0x80 : 0x00);
 313         }
 314         else if (addr == 0xC012)
 315         {
 316 #ifdef SOFT_SWITCH_DEBUGGING
 317 WriteLog("RDLCRAM (read)\n");
 318 #endif
 319                 return (readRAM ? 0x80 : 0x00);
 320         }
 321         else if (addr == 0xC013)
 322         {
 323 #ifdef SOFT_SWITCH_DEBUGGING
 324 WriteLog("RAMRD (read)\n");
 325 #endif
 326                 return (ramrd ? 0x80 : 0x00);
 327         }
 328         else if (addr == 0xC014)
 329         {
 330 #ifdef SOFT_SWITCH_DEBUGGING
 331 WriteLog("RAMWRT (read)\n");
 332 #endif
 333                 return (ramwrt ? 0x80 : 0x00);
 334         }
 335         else if (addr == 0xC015)
 336         {
 337 #ifdef SOFT_SWITCH_DEBUGGING
 338 WriteLog("SLOTCXROM (read)\n");
 339 #endif
 340                 return (slotCXROM ? 0x80 : 0x00);
 341         }
 342         else if (addr == 0xC016)
 343         {
 344 #ifdef SOFT_SWITCH_DEBUGGING
 345 WriteLog("ALTZP (read)\n");
 346 #endif
 347                 return (altzp ? 0x80 : 0x00);
 348         }
 349         else if (addr == 0xC017)
 350         {
 351 #ifdef SOFT_SWITCH_DEBUGGING
 352 WriteLog("SLOTC3ROM (read)\n");
 353 #endif
 354                 return (slotC3ROM ? 0x80 : 0x00);
 355         }
 356         else if (addr == 0xC018)
 357         {
 358 #ifdef SOFT_SWITCH_DEBUGGING
 359 WriteLog("80STORE (read)\n");
 360 #endif
 361                 return (store80Mode ? 0x80 : 0x00);
 362         }
 363         else if (addr == 0xC019)
 364         {
 365 #ifdef SOFT_SWITCH_DEBUGGING
 366 WriteLog("VBL (read)\n");
 367 #endif
 368 // NB: The doco suggests that this signal goes LOW when in the VBI.
 369 // Which means that we need to control this by counting lines somewhere.
 370                 return (vbl ? 0x80 : 0x00);
 371         }
 372         else if (addr == 0xC01A)
 373         {
 374 #ifdef SOFT_SWITCH_DEBUGGING
 375 WriteLog("TEXT (read)\n");
 376 #endif
 377                 return (textMode ? 0x80 : 0x00);
 378         }
 379         else if (addr == 0xC01B)
 380         {
 381 #ifdef SOFT_SWITCH_DEBUGGING
 382 WriteLog("MIXED (read)\n");
 383 #endif
 384                 return (mixedMode ? 0x80 : 0x00);
 385         }
 386         else if (addr == 0xC01C)
 387         {
 388 #ifdef SOFT_SWITCH_DEBUGGING
 389 WriteLog("PAGE2 (read)\n");
 390 #endif
 391                 return (displayPage2 ? 0x80 : 0x00);
 392         }
 393         else if (addr == 0xC01D)
 394         {
 395 #ifdef SOFT_SWITCH_DEBUGGING
 396 WriteLog("HIRES (read)\n");
 397 #endif
 398                 return (hiRes ? 0x80 : 0x00);
 399         }
 400         else if (addr == 0xC01E)
 401         {
 402 #ifdef SOFT_SWITCH_DEBUGGING
 403 WriteLog("ALTCHARSET (read)\n");
 404 #endif
 405                 return (alternateCharset ? 0x80 : 0x00);
 406         }
 407         else if (addr == 0xC01F)
 408         {
 409 #ifdef SOFT_SWITCH_DEBUGGING
 410 WriteLog("80COL (read)\n");
 411 #endif
 412                 return (col80Mode ? 0x80 : 0x00);
 413         }
 414         else if ((addr & 0xFFF0) == 0xC030)             // Read $C030-$C03F
 415         {
 416                 ToggleSpeaker();
 417 //should it return something else here???
 418                 return 0x00;
 419         }
 420         else if (addr == 0xC050)                                // Read $C050
 421         {
 422 #ifdef SOFT_SWITCH_DEBUGGING
 423 WriteLog("TEXT off (read)\n");
 424 #endif
 425                 textMode = false;
 426         }
 427         else if (addr == 0xC051)                                // Read $C051
 428         {
 429 #ifdef SOFT_SWITCH_DEBUGGING
 430 WriteLog("TEXT on (read)\n");
 431 #endif
 432                 textMode = true;
 433         }
 434         else if (addr == 0xC052)                                // Read $C052
 435         {
 436 #ifdef SOFT_SWITCH_DEBUGGING
 437 WriteLog("MIXED off (read)\n");
 438 #endif
 439                 mixedMode = false;
 440         }
 441         else if (addr == 0xC053)                                // Read $C053
 442         {
 443 #ifdef SOFT_SWITCH_DEBUGGING
 444 WriteLog("MIXED on (read)\n");
 445 #endif
 446                 mixedMode = true;
 447         }
 448         else if (addr == 0xC054)                                // Read $C054
 449         {
 450 #ifdef SOFT_SWITCH_DEBUGGING
 451 WriteLog("PAGE2 off (read)\n");
 452 #endif
 453                 displayPage2 = false;
 454         }
 455         else if (addr == 0xC055)                                // Read $C055
 456         {
 457 #ifdef SOFT_SWITCH_DEBUGGING
 458 WriteLog("PAGE2 on (read)\n");
 459 #endif
 460                 displayPage2 = true;
 461         }
 462         else if (addr == 0xC056)                                // Read $C056
 463         {
 464 #ifdef SOFT_SWITCH_DEBUGGING
 465 WriteLog("HIRES off (read)\n");
 466 #endif
 467                 hiRes = false;
 468         }
 469         else if (addr == 0xC057)                                // Read $C057
 470         {
 471 #ifdef SOFT_SWITCH_DEBUGGING
 472 WriteLog("HIRES on (read)\n");
 473 #endif
 474                 hiRes = true;
 475         }
 476         else if (addr == 0xC05E)
 477         {
 478 #ifdef SOFT_SWITCH_DEBUGGING
 479 WriteLog("DHIRES on (read)\n");
 480 #endif
 481                 if (ioudis)
 482                         dhires = true;
 483         }
 484         else if (addr == 0xC05F)
 485         {
 486 #ifdef SOFT_SWITCH_DEBUGGING
 487 WriteLog("DHIRES off (read)\n");
 488 #endif
 489                 if (ioudis)
 490                         dhires = false;
 491         }
 492         else if (addr == 0xC061)                                // Read $C061
 493         {
 494                 // Open Apple key (or push button 0)
 495                 return (openAppleDown ? 0x80 : 0x00);
 496         }
 497         else if (addr == 0xC062)                                // Read $C062
 498         {
 499                 // Open Apple key (or push button 0)
 500                 return (closedAppleDown ? 0x80 : 0x00);
 501         }
 502         // The way the paddles work is that a strobe is written (or read) to $C070,
 503         // then software counts down the time that it takes for the paddle outputs
 504         // to have bit 7 return to 0. If there are no paddles connected, bit 7
 505         // stays at 1.
 506         else if (addr == 0xC064)        // Paddles 0-3
 507         {
 508                 return 0xFF;
 509         }
 510         else if (addr == 0xC065)
 511         {
 512                 return 0xFF;
 513         }
 514         else if (addr == 0xC066)
 515         {
 516                 return 0xFF;
 517         }
 518         else if (addr == 0xC067)
 519         {
 520                 return 0xFF;
 521         }
 522         else if (addr == 0xC07E)
 523         {
 524 #ifdef SOFT_SWITCH_DEBUGGING
 525 WriteLog("IOUDIS (read)\n");
 526 #endif
 527                 return (ioudis ? 0x80 : 0x00);
 528         }
 529         else if (addr == 0xC07F)
 530         {
 531 #ifdef SOFT_SWITCH_DEBUGGING
 532 WriteLog("DHIRES (read)\n");
 533 #endif
 534                 return (dhires ? 0x80 : 0x00);
 535         }
 536
 537 //Note that this is a kludge: The $D000-$DFFF 4K space is shared (since $C000-$CFFF is
 538 //memory mapped) between TWO banks, and that that $E000-$FFFF RAM space is a single bank.
 539 //[SHOULD BE FIXED NOW]
 540 //OK! This switch selects bank 2 of the 4K bank at $D000-$DFFF. One access makes it
 541 //visible, two makes it R/W.
 542
 543 /*
 544 301  LDA $E000
 545 304  PHA
 546 305  LDA $C081
 547 308  PLA
 548 309  PHA
 549 30A  CMP $E000
 550 30D  BNE $332
 551 30F  LDA $C083
 552 312  LDA $C083
 553 315  LDA #$A5
 554 317  STA $D000
 555 31A  CMP $D000
 556 31D  BNE $332
 557 31F  LSR A
 558 320  STA $D000
 559 323  CMP $D000
 560 326  BNE $332
 561 328  LDA $C081
 562 32B  LDA $C081
 563 32E  LDA #$01
 564 330  BNE $334
 565 332  LDA #$00
 566 334  STA $300
 567 337  PLA
 568 338  CMP $E000
 569 33B  BEQ $340
 570 33D  LDA $C080
 571 340  RTS
 572
 573 A = PEEK($C082)
 574 */
 575
 576         else if ((addr & 0xFFFB) == 0xC080)
 577         {
 578 #ifdef DEBUG_LC
 579 WriteLog("LC(R): $C080 49280 OECG R Read RAM bank 2; no write\n");
 580 #endif
 581 //$C080 49280              OECG  R   Read RAM bank 2; no write
 582                 visibleBank = LC_BANK_2;
 583                 readRAM = true;
 584                 writeRAM = false;
 585         }
 586         else if ((addr & 0xFFFB) == 0xC081)
 587         {
 588 #ifdef DEBUG_LC
 589 WriteLog("LC(R): $C081 49281 OECG RR Read ROM; write RAM bank 2\n");
 590 #endif
 591 //$C081 49281 ROMIN        OECG  RR  Read ROM; write RAM bank 2
 592                 visibleBank = LC_BANK_2;
 593                 readRAM = false;
 594                 writeRAM = true;
 595         }
 596         else if ((addr & 0xFFFB) == 0xC082)
 597         {
 598 #ifdef DEBUG_LC
 599 WriteLog("LC(R): $C082 49282 OECG R Read ROM; no write\n");
 600 #endif
 601 //$C082 49282              OECG  R   Read ROM; no write
 602                 visibleBank = LC_BANK_2;
 603                 readRAM = false;
 604                 writeRAM = false;
 605         }
 606         else if ((addr & 0xFFFB) == 0xC083)
 607         {
 608 #ifdef DEBUG_LC
 609 WriteLog("LC(R): $C083 49283 OECG RR Read/Write RAM bank 2\n");
 610 #endif
 611 //$C083 49283 LCBANK2      OECG  RR  Read/write RAM bank 2
 612                 visibleBank = LC_BANK_2;
 613                 readRAM = true;
 614                 writeRAM = true;
 615         }
 616         else if ((addr & 0xFFFB) == 0xC088)
 617         {
 618 #ifdef DEBUG_LC
 619 WriteLog("LC(R): $%04X 49288 OECG R Read RAM bank 1; no write\n", addr);
 620 #endif
 621 //$C088 49288              OECG  R   Read RAM bank 1; no write
 622                 visibleBank = LC_BANK_1;
 623                 readRAM = true;
 624                 writeRAM = false;
 625 //Hm. Some stuff seems to want this.
 626 //nope, was looking at $C0E8... return 0xFF;
 627         }
 628         else if ((addr & 0xFFFB) == 0xC089)
 629         {
 630 #ifdef DEBUG_LC
 631 WriteLog("LC(R): $C089 49289 OECG RR Read ROM; write RAM bank 1\n");
 632 #endif
 633 //$C089 49289              OECG  RR  Read ROM; write RAM bank 1
 634                 visibleBank = LC_BANK_1;
 635                 readRAM = false;
 636                 writeRAM = true;
 637         }
 638         else if ((addr & 0xFFFB) == 0xC08A)
 639         {
 640 #ifdef DEBUG_LC
 641 WriteLog("LC(R): $C08A 49290 OECG R Read ROM; no write\n");
 642 #endif
 643 //$C08A 49290              OECG  R   Read ROM; no write
 644                 visibleBank = LC_BANK_1;
 645                 readRAM = false;
 646                 writeRAM = false;
 647         }
 648         else if ((addr & 0xFFFB) == 0xC08B)
 649         {
 650 #ifdef DEBUG_LC
 651 WriteLog("LC(R): $C08B 49291 OECG RR Read/Write RAM bank 1\n");
 652 #endif
 653 //$C08B 49291              OECG  RR  Read/write RAM bank 1
 654                 visibleBank = LC_BANK_1;
 655                 readRAM = true;
 656                 writeRAM = true;
 657         }
 658         else if ((addr & 0xFFF8) == 0xC0E0)
 659         {
 660                 floppyDrive.ControlStepper(addr & 0x07);
 661         }
 662         else if ((addr & 0xFFFE) == 0xC0E8)
 663         {
 664                 floppyDrive.ControlMotor(addr & 0x01);
 665         }
 666         else if ((addr & 0xFFFE) == 0xC0EA)
 667         {
 668                 floppyDrive.DriveEnable(addr & 0x01);
 669         }
 670         else if (addr == 0xC0EC)
 671         {
 672                 return floppyDrive.ReadWrite();
 673         }
 674         else if (addr == 0xC0ED)
 675         {
 676                 return floppyDrive.GetLatchValue();
 677         }
 678         else if (addr == 0xC0EE)
 679         {
 680                 floppyDrive.SetReadMode();
 681         }
 682         else if (addr == 0xC0EF)
 683         {
 684                 floppyDrive.SetWriteMode();
 685         }
 686
 687 //#define LC_DEBUGGING
 688 #ifdef LC_DEBUGGING
 689 bool showpath = false;
 690 if (addr >= 0xD000 && addr <= 0xD00F)
 691         showpath = true;
 692 #endif
 693 //This sux...
 694         if (addr >= 0xC100 && addr <= 0xC7FF)   // The $C000-$CFFF block is *never* RAM
 695         {
 696 // Looks like the ][e ref manual got this one wrong: slotCXROM set should mean
 697 // use internal ROM, NOT slot ROM. :-/
 698 // (fixed now, by setting the switch correctly in the write mem section :-P)
 699                 if (!slotCXROM)
 700 //              if (slotCXROM)
 701                         b = rom[addr];
 702                 else
 703                 {
 704                         if (addr >= 0xC100 && addr <= 0xC1FF)
 705                                 b = parallelROM[addr & 0xFF];
 706                         else if (addr >= 0xC600 && addr <= 0xC6FF)
 707                                 b = diskROM[addr & 0xFF];
 708                         else if (addr >= 0xC300 && addr <= 0xC3FF && !slotC3ROM)
 709                                 b = rom[addr];
 710                         else
 711                                 b = 0xFF;
 712 //                              b = rom[addr];
 713                 }
 714 #ifdef LC_DEBUGGING
 715 if (showpath)
 716         WriteLog("b is from $C100-$CFFF block...\n");
 717 #endif
 718         }
 719         else if (addr >= 0xC800 && addr <= 0xCFFF)      // 2K peripheral or OS ROM
 720         {
 721                 b = rom[addr];
 722         }
 723         else if (addr >= 0xD000)
 724         {
 725                 if (readRAM)
 726                 {
 727                         if (addr <= 0xDFFF && visibleBank == LC_BANK_1)
 728 #ifdef LC_DEBUGGING
 729                         {
 730 #endif
 731 //                              b = ram[addr - 0x1000];
 732                                 b = (altzp ? ram2[addr - 0x1000] : ram[addr - 0x1000]);
 733 #ifdef LC_DEBUGGING
 734 if (showpath)
 735         WriteLog("b is from LC bank #1 (ram[addr - 0x1000])...\n");
 736                         }
 737 #endif
 738                         else
 739 #ifdef LC_DEBUGGING
 740                         {
 741 #endif
 742 //                              b = ram[addr];
 743                                 b = (altzp ? ram2[addr] : ram[addr]);
 744 #ifdef LC_DEBUGGING
 745 if (showpath)
 746         WriteLog("b is from LC bank #2 (ram[addr])...\n");
 747                         }
 748 #endif
 749                 }
 750                 else
 751 #ifdef LC_DEBUGGING
 752                 {
 753 #endif
 754                         b = rom[addr];
 755 #ifdef LC_DEBUGGING
 756 if (showpath)
 757         WriteLog("b is from LC ROM (rom[addr])...\n");
 758                 }
 759 #endif
 760         }
 761         else
 762         {
 763 // 80STORE only works for WRITING, not READING!
 764 #if 0
 765                 // Check for 80STORE mode (STORE80 takes precedence over RAMRD/WRT)...
 766                 if ((((addr >= 0x0400) && (addr <= 0x07FF)) || ((addr >= 0x2000) && (addr <= 0x3FFF))) && store80Mode)
 767                 {
 768                         if (displayPage2)
 769                                 b = ram2[addr];
 770                         else
 771                                 b = ram[addr];
 772
 773                         return b;
 774                 }
 775 #endif
 776
 777                 // Finally, check for auxillary/altzp write switches
 778                 if (addr < 0x0200)
 779                         b = (altzp ? ram2[addr] : ram[addr]);
 780                 else
 781                         b = (ramrd ? ram2[addr] : ram[addr]);
 782 #ifdef LC_DEBUGGING
 783 if (showpath)
 784         WriteLog("b is from ram[addr]...\n");
 785 #endif
 786         }
 787
 788 #ifdef LC_DEBUGGING
 789 if (addr >= 0xD000 && addr <= 0xD00F)
 790 {
 791         WriteLog("*** Read from $%04X: $%02X (readRAM=%s, PC=%04X, ram$D000=%02X)\n", addr, b, (readRAM ? "T" : "F"), mainCPU.pc, ram[0xC000]);
 792 }
 793 #endif
 794
 795         return b;
 796 }
 797
 798 /*
 799 A-9 (Mockingboard)
 800 APPENDIX F Assembly Language Program Listings
 801
 802         1       *PRIMARY ROUTINES
 803         2       *FOR SLOT 4
 804         3       *
 805         4                       ORG     $9000
 806         5       *                               ;ADDRESSES FOR FIRST 6522
 807         6       ORB             EQU     $C400           ;PORT B
 808         7       ORA             EQU     $C401           ;PORT A
 809         8       DDRB            EQU     $C402           ;DATA DIRECTION REGISTER (A)
 810         9       DDRA            EQU     $C403           ;DATA DIRECTION REGISTER (B)
 811         10      *                                       ;ADDRESSES FOR SECOND 6522
 812         11      ORB2            EQU     $C480           ;PORT B
 813         12      ORA2            EQU     $C481           ;PORT A
 814         13      DDRB2   EQU     $C482           ;DATA DIRECTION REGISTER (B)
 815         14      DDRA2   EQU     $C483           ;DATA DIRECTION REGISTER (A)
 816 */
 817 void WrMem(uint16_t addr, uint8_t b)
 818 {
 819 //temp...
 820 //extern V6809REGS regs;
 821 //if (addr >= 0xC800 && addr <= 0xCBFE)
 822 //if (addr == 0xC80F || addr == 0xC80D)
 823 //      WriteLog("WrMem: Writing address %04X with %02X [PC=%04X, $CB00=%02X]\n", addr, b, regs.pc, gram[0xCB00]);//*/
 824
 825 #if 0
 826 if (addr >= 0xC000 && addr <= 0xC0FF)
 827         WriteLog("\n*** Write at I/O address %04X\n", addr);
 828 #endif
 829 /*
 830 Check the BIKO version on Asimov to see if it's been cracked or not...
 831
 832 7F3D: 29 07          AND   #$07       [PC=7F3F, SP=01EA, CC=---B-I--, A=01, X=4B, Y=00]
 833 7F3F: C9 06          CMP   #$06       [PC=7F41, SP=01EA, CC=N--B-I--, A=01, X=4B, Y=00]
 834 7F41: 90 03          BCC   $7F46      [PC=7F46, SP=01EA, CC=N--B-I--, A=01, X=4B, Y=00]
 835 [7F43: 4C 83 7E      JMP   $7E83] <- Skipped over... (Prints "THANK YOU VERY MUCH!")
 836 7F46: AA             TAX              [PC=7F47, SP=01EA, CC=---B-I--, A=01, X=01, Y=00]
 837
 838 ; INX here *ensures* 1 - 6!!! BUG!!!
 839 ; Or is it? Could this be part of a braindead copy protection scheme? It's
 840 ; awfully close to NOP ($EA)...
 841 ; Nothing else touches it once it's been written... Hmm...
 842
 843 7F47: E8             INX              [PC=7F48, SP=01EA, CC=---B-I--, A=01, X=02, Y=00]
 844 7F48: F8             SED              [PC=7F49, SP=01EA, CC=---BDI--, A=01, X=02, Y=00]
 845 7F49: 18             CLC              [PC=7F4A, SP=01EA, CC=---BDI--, A=01, X=02, Y=00]
 846 7F4A: BD 15 4E       LDA   $4E15,X    [PC=7F4D, SP=01EA, CC=---BDI--, A=15, X=02, Y=00]
 847
 848 ; 4E13: 03 00
 849 ; 4E15: 25 25 15 15 10 20
 850 ; 4E1B: 03 41 99 99 01 00 12
 851 ; 4E22: 99 70
 852
 853 7F4D: 65 FC          ADC   $FC        [PC=7F4F, SP=01EA, CC=---BDI--, A=16, X=02, Y=00]
 854 7F4F: 65 FC          ADC   $FC        [PC=7F51, SP=01EA, CC=---BDI--, A=17, X=02, Y=00]
 855 7F51: 65 FC          ADC   $FC        [PC=7F53, SP=01EA, CC=---BDI--, A=18, X=02, Y=00]
 856 7F53: 65 FC          ADC   $FC        [PC=7F55, SP=01EA, CC=---BDI--, A=19, X=02, Y=00]
 857
 858 ; NO checking is done on the raised stat! Aarrrgggghhhhh!
 859
 860 7F55: 9D 15 4E       STA   $4E15,X    [PC=7F58, SP=01EA, CC=---BDI--, A=19, X=02, Y=00]
 861 7F58: D8             CLD              [PC=7F59, SP=01EA, CC=---B-I--, A=19, X=02, Y=00]
 862
 863 ; Print "ALAKAZAM!" and so on...
 864
 865 7F59: 20 2C 40       JSR   $402C      [PC=402C, SP=01E8, CC=---B-I--, A=19, X=02, Y=00]
 866 */
 867 #if 0
 868 if (addr == 0x7F47)
 869         WriteLog("\n*** Byte %02X written at address %04X\n", b, addr);
 870 #endif
 871 /*
 872 I think this is IIc/IIe only...
 873
 874 CLR80STORE=$C000 ;80STORE Off- disable 80-column memory mapping (Write)
 875 SET80STORE=$C001 ;80STORE On- enable 80-column memory mapping (WR-only)
 876
 877 CLRAUXRD = $C002 ;read from main 48K (WR-only)
 878 SETAUXRD = $C003 ;read from aux/alt 48K (WR-only)
 879
 880 CLRAUXWR = $C004 ;write to main 48K (WR-only)
 881 SETAUXWR = $C005 ;write to aux/alt 48K (WR-only)
 882
 883 CLRCXROM = $C006 ;use ROM on cards (WR-only)
 884 SETCXROM = $C007 ;use internal ROM (WR-only)
 885
 886 CLRAUXZP = $C008 ;use main zero page, stack, & LC (WR-only)
 887 SETAUXZP = $C009 ;use alt zero page, stack, & LC (WR-only)
 888
 889 CLRC3ROM = $C00A ;use internal Slot 3 ROM (WR-only)
 890 SETC3ROM = $C00B ;use external Slot 3 ROM (WR-only)
 891
 892 CLR80VID = $C00C ;disable 80-column display mode (WR-only)
 893 SET80VID = $C00D ;enable 80-column display mode (WR-only)
 894
 895 CLRALTCH = $C00E ;use main char set- norm LC, Flash UC (WR-only)
 896 SETALTCH = $C00F ;use alt char set- norm inverse, LC; no Flash (WR-only)
 897 */
 898         if (addr == 0xC000)
 899         {
 900 #ifdef SOFT_SWITCH_DEBUGGING
 901 WriteLog("80STORE off (write)\n");
 902 #endif
 903                 store80Mode = false;
 904         }
 905         else if (addr == 0xC001)
 906         {
 907 #ifdef SOFT_SWITCH_DEBUGGING
 908 WriteLog("80STORE on (write)\n");
 909 #endif
 910                 store80Mode = true;
 911         }
 912         else if (addr == 0xC002)
 913         {
 914 #ifdef SOFT_SWITCH_DEBUGGING
 915 WriteLog("RAMRD off (write)\n");
 916 #endif
 917                 ramrd = false;
 918         }
 919         else if (addr == 0xC003)
 920         {
 921 #ifdef SOFT_SWITCH_DEBUGGING
 922 WriteLog("RAMRD on (write)\n");
 923 #endif
 924                 ramrd = true;
 925         }
 926         else if (addr == 0xC004)
 927         {
 928 #ifdef SOFT_SWITCH_DEBUGGING
 929 WriteLog("RAMWRT off (write)\n");
 930 #endif
 931                 ramwrt = false;
 932         }
 933         else if (addr == 0xC005)
 934         {
 935 #ifdef SOFT_SWITCH_DEBUGGING
 936 WriteLog("RAMWRT on (write)\n");
 937 #endif
 938                 ramwrt = true;
 939         }
 940         else if (addr == 0xC006)
 941         {
 942                 // This is the only soft switch that breaks the usual convention.
 943 #ifdef SOFT_SWITCH_DEBUGGING
 944 WriteLog("SLOTCXROM on (write)\n");
 945 #endif
 946                 slotCXROM = true;
 947         }
 948         else if (addr == 0xC007)
 949         {
 950 #ifdef SOFT_SWITCH_DEBUGGING
 951 WriteLog("SLOTCXROM off (write)\n");
 952 #endif
 953                 slotCXROM = false;
 954         }
 955         else if (addr == 0xC008)
 956         {
 957 #ifdef SOFT_SWITCH_DEBUGGING
 958 WriteLog("ALTZP off (write)\n");
 959 #endif
 960                 altzp = false;
 961         }
 962         else if (addr == 0xC009)
 963         {
 964 #ifdef SOFT_SWITCH_DEBUGGING
 965 WriteLog("ALTZP on (write)\n");
 966 #endif
 967                 altzp = true;
 968         }
 969         else if (addr == 0xC00A)
 970         {
 971 #ifdef SOFT_SWITCH_DEBUGGING
 972 WriteLog("SLOTC3ROM off (write)\n");
 973 #endif
 974                 slotC3ROM = false;
 975         }
 976         else if (addr == 0xC00B)
 977         {
 978 #ifdef SOFT_SWITCH_DEBUGGING
 979 WriteLog("SLOTC3ROM on (write)\n");
 980 #endif
 981                 slotC3ROM = true;
 982         }
 983         else if (addr == 0xC00C)
 984         {
 985 #ifdef SOFT_SWITCH_DEBUGGING
 986 WriteLog("80COL off (write)\n");
 987 #endif
 988                 col80Mode = false;
 989         }
 990         else if (addr == 0xC00D)
 991         {
 992 #ifdef SOFT_SWITCH_DEBUGGING
 993 WriteLog("80COL on (write)\n");
 994 #endif
 995                 col80Mode = true;
 996         }
 997         else if (addr == 0xC00E)
 998         {
 999 #ifdef SOFT_SWITCH_DEBUGGING
1000 WriteLog("ALTCHARSET off (write)\n");
1001 #endif
1002                 alternateCharset = false;
1003         }
1004         else if (addr == 0xC00F)
1005         {
1006 #ifdef SOFT_SWITCH_DEBUGGING
1007 WriteLog("ALTCHARSET on (write)\n");
1008 #endif
1009                 alternateCharset = true;
1010         }
1011         else if ((addr & 0xFFF0) == 0xC010)             // Keyboard strobe
1012         {
1013 //Actually, according to the A2 ref, this should do nothing since a write
1014 //is immediately preceded by a read leaving it in the same state it was...
1015 //But leaving this out seems to fuck up the key handling of some games...
1016                 keyDown = false;
1017         }
1018         else if ((addr & 0xFFF0) == 0xC030)             // Read $C030-$C03F
1019         {
1020 //Likewise, the speaker is supposed to do nothing if you write to it, and
1021 //for the same reason. But without this, you get no sound in David's
1022 //Midnight Magic...
1023                 ToggleSpeaker();
1024         }
1025         else if (addr == 0xC050)
1026         {
1027 #ifdef SOFT_SWITCH_DEBUGGING
1028 WriteLog("TEXT off (write)\n");
1029 #endif
1030                 textMode = false;
1031         }
1032         else if (addr == 0xC051)
1033         {
1034 #ifdef SOFT_SWITCH_DEBUGGING
1035 WriteLog("TEXT on (write)\n");
1036 #endif
1037                 textMode = true;
1038         }
1039         else if (addr == 0xC052)
1040         {
1041 #ifdef SOFT_SWITCH_DEBUGGING
1042 WriteLog("MIXED off (write)\n");
1043 #endif
1044                 mixedMode = false;
1045         }
1046         else if (addr == 0xC053)
1047         {
1048 #ifdef SOFT_SWITCH_DEBUGGING
1049 WriteLog("MIXED on (write)\n");
1050 #endif
1051                 mixedMode = true;
1052         }
1053         else if (addr == 0xC054)
1054         {
1055 #ifdef SOFT_SWITCH_DEBUGGING
1056 WriteLog("PAGE2 off (write)\n");
1057 #endif
1058                 displayPage2 = false;
1059         }
1060         else if (addr == 0xC055)
1061         {
1062 #ifdef SOFT_SWITCH_DEBUGGING
1063 WriteLog("PAGE2 on (write)\n");
1064 #endif
1065                 displayPage2 = true;
1066         }
1067         else if (addr == 0xC056)
1068         {
1069 #ifdef SOFT_SWITCH_DEBUGGING
1070 WriteLog("HIRES off (write)\n");
1071 #endif
1072                 hiRes = false;
1073         }
1074         else if (addr == 0xC057)
1075         {
1076 #ifdef SOFT_SWITCH_DEBUGGING
1077 WriteLog("HIRES on (write)\n");
1078 #endif
1079                 hiRes = true;
1080         }
1081         else if (addr == 0xC05E)
1082         {
1083 #ifdef SOFT_SWITCH_DEBUGGING
1084 WriteLog("DHIRES on (write)\n");
1085 #endif
1086                 if (ioudis)
1087                         dhires = true;
1088
1089 //static int goDumpDis = 0;
1090 //goDumpDis++;
1091 //if (goDumpDis == 2)
1092 //      dumpDis = true;
1093         }
1094         else if (addr == 0xC05F)
1095         {
1096 #ifdef SOFT_SWITCH_DEBUGGING
1097 WriteLog("DHIRES off (write)\n");
1098 #endif
1099                 if (ioudis)
1100                         dhires = false;
1101         }
1102         else if (addr == 0xC07E)
1103         {
1104 #ifdef SOFT_SWITCH_DEBUGGING
1105 WriteLog("IOUDIS on (write)\n");
1106 #endif
1107                 ioudis = true;
1108         }
1109         else if (addr == 0xC07F)
1110         {
1111 #ifdef SOFT_SWITCH_DEBUGGING
1112 WriteLog("IOUDIS off (write)\n");
1113 #endif
1114                 ioudis = false;
1115         }
1116         else if ((addr & 0xFFFB) == 0xC080)
1117         {
1118 #ifdef DEBUG_LC
1119 WriteLog("LC(R): $C080 49280 OECG R Read RAM bank 2; no write\n");
1120 #endif
1121 //$C080 49280              OECG  R   Read RAM bank 2; no write
1122                 visibleBank = LC_BANK_2;
1123                 readRAM = true;
1124                 writeRAM = false;
1125         }
1126         else if ((addr & 0xFFFB) == 0xC081)
1127         {
1128 #ifdef DEBUG_LC
1129 WriteLog("LC(R): $C081 49281 OECG RR Read ROM; write RAM bank 2\n");
1130 #endif
1131 //$C081 49281 ROMIN        OECG  RR  Read ROM; write RAM bank 2
1132                 visibleBank = LC_BANK_2;
1133                 readRAM = false;
1134                 writeRAM = true;
1135         }
1136         else if ((addr & 0xFFFB) == 0xC082)
1137         {
1138 #ifdef DEBUG_LC
1139 WriteLog("LC(R): $C082 49282 OECG R Read ROM; no write\n");
1140 #endif
1141 //$C082 49282              OECG  R   Read ROM; no write
1142                 visibleBank = LC_BANK_2;
1143                 readRAM = false;
1144                 writeRAM = false;
1145         }
1146         else if ((addr & 0xFFFB) == 0xC083)
1147         {
1148 #ifdef DEBUG_LC
1149 WriteLog("LC(R): $C083 49283 OECG RR Read/Write RAM bank 2\n");
1150 #endif
1151 //$C083 49283 LCBANK2      OECG  RR  Read/write RAM bank 2
1152                 visibleBank = LC_BANK_2;
1153                 readRAM = true;
1154                 writeRAM = true;
1155         }
1156         else if ((addr & 0xFFFB) == 0xC088)
1157         {
1158 #ifdef DEBUG_LC
1159 WriteLog("LC(R): $C088 49288 OECG R Read RAM bank 1; no write\n");
1160 #endif
1161 //$C088 49288              OECG  R   Read RAM bank 1; no write
1162                 visibleBank = LC_BANK_1;
1163                 readRAM = true;
1164                 writeRAM = false;
1165         }
1166         else if ((addr & 0xFFFB) == 0xC089)
1167         {
1168 #ifdef DEBUG_LC
1169 WriteLog("LC(R): $C089 49289 OECG RR Read ROM; write RAM bank 1\n");
1170 #endif
1171 //$C089 49289              OECG  RR  Read ROM; write RAM bank 1
1172                 visibleBank = LC_BANK_1;
1173                 readRAM = false;
1174                 writeRAM = true;
1175         }
1176         else if ((addr & 0xFFFB) == 0xC08A)
1177         {
1178 #ifdef DEBUG_LC
1179 WriteLog("LC(R): $C08A 49290 OECG R Read ROM; no write\n");
1180 #endif
1181 //$C08A 49290              OECG  R   Read ROM; no write
1182                 visibleBank = LC_BANK_1;
1183                 readRAM = false;
1184                 writeRAM = false;
1185         }
1186         else if ((addr & 0xFFFB) == 0xC08B)
1187         {
1188 #ifdef DEBUG_LC
1189 WriteLog("LC(R): $C08B 49291 OECG RR Read/Write RAM bank 1\n");
1190 #endif
1191 //$C08B 49291              OECG  RR  Read/write RAM bank 1
1192                 visibleBank = LC_BANK_1;
1193                 readRAM = true;
1194                 writeRAM = true;
1195         }
1196 //This is determined by which slot it is in--this assumes slot 6. !!! FIX !!!
1197         else if ((addr & 0xFFF8) == 0xC0E0)
1198         {
1199                 floppyDrive.ControlStepper(addr & 0x07);
1200         }
1201         else if ((addr & 0xFFFE) == 0xC0E8)
1202         {
1203                 floppyDrive.ControlMotor(addr & 0x01);
1204         }
1205         else if ((addr & 0xFFFE) == 0xC0EA)
1206         {
1207                 floppyDrive.DriveEnable(addr & 0x01);
1208         }
1209         else if (addr == 0xC0EC)
1210         {
1211 //change this to Write()? (and the other to Read()?) Dunno. Seems to work OK, but still...
1212 //or DoIO
1213                 floppyDrive.ReadWrite();
1214         }
1215         else if (addr == 0xC0ED)
1216         {
1217                 floppyDrive.SetLatchValue(b);
1218         }
1219         else if (addr == 0xC0EE)
1220         {
1221                 floppyDrive.SetReadMode();
1222         }
1223         else if (addr == 0xC0EF)
1224         {
1225                 floppyDrive.SetWriteMode();
1226         }
1227
1228         if (addr >= 0xC000 && addr <= 0xCFFF)
1229                 return; // Protect LC bank #1 from being written to!
1230
1231         if (addr >= 0xD000)
1232         {
1233                 if (writeRAM)
1234                 {
1235 #if 0
1236                         if (addr <= 0xDFFF && visibleBank == LC_BANK_1)
1237                                 ram[addr - 0x1000] = b;
1238                         else
1239                                 ram[addr] = b;
1240 #else
1241                         if (addr <= 0xDFFF && visibleBank == LC_BANK_1)
1242                         {
1243                                 if (altzp)
1244                                         ram2[addr - 0x1000] = b;
1245                                 else
1246                                         ram[addr - 0x1000] = b;
1247                         }
1248                         else
1249                         {
1250                                 if (altzp)
1251                                         ram2[addr] = b;
1252                                 else
1253                                         ram[addr] = b;
1254                         }
1255 #endif
1256                 }
1257
1258                 return;
1259         }
1260
1261         // Check for 80STORE mode (STORE80 takes precedence over RAMRD/WRT)...
1262         if ((((addr >= 0x0400) && (addr <= 0x07FF)) || ((addr >= 0x2000) && (addr <= 0x3FFF))) && store80Mode)
1263         {
1264                 if (displayPage2)
1265                         ram2[addr] = b;
1266                 else
1267                         ram[addr] = b;
1268
1269                 return;
1270         }
1271
1272         // Finally, check for auxillary/altzp write switches
1273 #if 0
1274         if (ramwrt)
1275                 ram2[addr] = b;
1276         else
1277         {
1278                 if (altzp)
1279                         ram2[addr] = b;
1280                 else
1281                         ram[addr] = b;
1282         }
1283 #else
1284         if (addr < 0x0200)
1285 //      if (addr < 0x0200 || addr >= 0xD000)
1286         {
1287 #if 0
1288 if (addr == 0x38)
1289         WriteLog("Write $38: $%02X\n", b);
1290 else if (addr == 0x39)
1291         WriteLog("Write $39: $%02X\n", b);
1292 #endif
1293                 if (altzp)
1294                         ram2[addr] = b;
1295                 else
1296                         ram[addr] = b;
1297         }
1298         else
1299         {
1300                 if (ramwrt)
1301                         ram2[addr] = b;
1302                 else
1303                         ram[addr] = b;
1304         }
1305 #endif
1306 }
1307
1308
1309 //
1310 // Load a file into RAM/ROM image space
1311 //
1312 bool LoadImg(char * filename, uint8_t * ram, int size)
1313 {
1314         FILE * fp = fopen(filename, "rb");
1315
1316         if (fp == NULL)
1317                 return false;
1318
1319         fread(ram, 1, size, fp);
1320         fclose(fp);
1321
1322         return true;
1323 }
1324
1325
1326 static void SaveApple2State(const char * filename)
1327 {
1328 }
1329
1330
1331 static bool LoadApple2State(const char * filename)
1332 {
1333         return false;
1334 }
1335
1336
1337 #ifdef CPU_CLOCK_CHECKING
1338 uint8_t counter = 0;
1339 uint32_t totalCPU = 0;
1340 uint64_t lastClock = 0;
1341 #endif
1342 //
1343 // Main loop
1344 //
1345 int main(int /*argc*/, char * /*argv*/[])
1346 {
1347         InitLog("./apple2.log");
1348         LoadSettings();
1349         srand(time(NULL));                                                                      // Initialize RNG
1350
1351         // Zero out memory
1352         memset(ram, 0, 0x10000);
1353         memset(rom, 0, 0x10000);
1354         memset(ram2, 0, 0x10000);
1355
1356 #if 1
1357         // Set up MMU
1358         SetupAddressMap();
1359
1360         // Set up V65C02 execution context
1361         memset(&mainCPU, 0, sizeof(V65C02REGS));
1362         mainCPU.RdMem = AppleReadMem;
1363         mainCPU.WrMem = AppleWriteMem;
1364 #else
1365         mainCPU.RdMem = RdMem;
1366         mainCPU.WrMem = WrMem;
1367 #endif
1368         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
1369
1370 //      alternateCharset = true;
1371 //      if (!LoadImg(settings.BIOSPath, rom + 0xD000, 0x3000))
1372         if (!LoadImg(settings.BIOSPath, rom + 0xC000, 0x4000))
1373         {
1374                 WriteLog("Could not open file '%s'!\n", settings.BIOSPath);
1375                 return -1;
1376         }
1377
1378 //This is now included...
1379 /*      if (!LoadImg(settings.diskPath, diskRom, 0x100))
1380         {
1381                 WriteLog("Could not open file '%s'!\nDisk II will be unavailable!\n", settings.diskPath);
1382 //              return -1;
1383         }//*/
1384
1385 //Load up disk image from config file (for now)...
1386         floppyDrive.LoadImage(settings.diskImagePath1, 0);
1387         floppyDrive.LoadImage(settings.diskImagePath2, 1);
1388 //      floppyDrive.LoadImage("./disks/temp.nib", 1);   // Load temp .nib file into second drive...
1389
1390 //Kill the DOS ROM in slot 6 for now...
1391 //not
1392 //      memcpy(rom + 0xC600, diskROM, 0x100);
1393 //      memcpy(rom + 0xC700, diskROM, 0x100);   // Slot 7???
1394
1395         WriteLog("About to initialize video...\n");
1396
1397         if (!InitVideo())
1398         {
1399                 std::cout << "Aborting!" << std::endl;
1400                 return -1;
1401         }
1402
1403         // Have to do this *after* video init but *before* sound init...!
1404 //Shouldn't be necessary since we're not doing emulation in the ISR...
1405         if (settings.autoStateSaving)
1406         {
1407                 // Load last state from file...
1408                 if (!LoadApple2State(settings.autoStatePath))
1409                         WriteLog("Unable to use Apple2 state file \"%s\"!\n", settings.autoStatePath);
1410         }
1411
1412
1413 #if 0
1414 // State loading!
1415 if (!LoadImg("./BT1_6502_RAM_SPACE.bin", ram, 0x10000))
1416 {
1417         cout << "Couldn't load state file!" << endl;
1418         cout << "Aborting!!" << endl;
1419         return -1;
1420 }
1421
1422 //A  P  Y  X  S     PC
1423 //-- -- -- -- ----- -----
1424 //00 75 3B 53 FD 01 41 44
1425
1426 mainCPU.cpuFlags = 0;
1427 mainCPU.a = 0x00;
1428 mainCPU.x = 0x53;
1429 mainCPU.y = 0x3B;
1430 mainCPU.cc = 0x75;
1431 mainCPU.sp = 0xFD;
1432 mainCPU.pc = 0x4441;
1433
1434 textMode = false;
1435 mixedMode = false;
1436 displayPage2 = false;
1437 hiRes = true;
1438
1439 //kludge...
1440 readHiRam = true;
1441 //dumpDis=true;
1442 //kludge II...
1443 memcpy(ram + 0xD000, ram + 0xC000, 0x1000);
1444 #endif
1445
1446         WriteLog("About to initialize audio...\n");
1447         SoundInit();
1448 //nope  SDL_EnableUNICODE(1);                                           // Needed to do key translation shit
1449
1450 //      gui = new GUI(surface);                                         // Set up the GUI system object...
1451 //      gui = new GUI(mainSurface);                                     // Set up the GUI system object...
1452 // SDL 2... this will likely cause Apple 2 to crash
1453 //      gui = new GUI(NULL);                                    // Set up the GUI system object...
1454 #if 0
1455         gui->AddMenuTitle("Apple2");
1456         gui->AddMenuItem("Test!", TestWindow/*, hotkey*/);
1457         gui->AddMenuItem("");
1458         gui->AddMenuItem("Quit", QuitEmulator, SDLK_q);
1459         gui->CommitItemsToMenu();
1460 #endif
1461
1462         SetupBlurTable();                                                       // Set up the color TV emulation blur table
1463         running = true;                                                         // Set running status...
1464
1465         InitializeEventList();                                          // Clear the event list before we use it...
1466         SetCallbackTime(FrameCallback, 16666.66666667); // Set frame to fire at 1/60 s interval
1467         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 s intervals
1468         startTicks = SDL_GetTicks();
1469
1470 #ifdef THREADED_65C02
1471         cpuCond = SDL_CreateCond();
1472         mainSem = SDL_CreateSemaphore(1);
1473         cpuThread = SDL_CreateThread(CPUThreadFunc, NULL, NULL);
1474 //Hmm... CPU does POST (+1), wait, then WAIT (-1)
1475 //      SDL_sem * mainMutex = SDL_CreateMutex();
1476 #endif
1477
1478         WriteLog("Entering main loop...\n");
1479         while (running)
1480         {
1481                 double timeToNextEvent = GetTimeToNextEvent();
1482 #ifndef THREADED_65C02
1483                 Execute65C02(&mainCPU, USEC_TO_M6502_CYCLES(timeToNextEvent));
1484 #endif
1485 //We MUST remove a frame's worth of time in order for the CPU to function... !!! FIX !!!
1486 //(Fix so that this is not a requirement!)
1487 //Fixed, but mainCPU.clock is destroyed in the bargain. Oh well.
1488 //              mainCPU.clock -= USEC_TO_M6502_CYCLES(timeToNextEvent);
1489
1490 #ifdef CPU_CLOCK_CHECKING
1491 #ifndef THREADED_65C02
1492 totalCPU += USEC_TO_M6502_CYCLES(timeToNextEvent);
1493 #endif
1494 #endif
1495                 // Handle CPU time delta for sound...
1496 //Don't need this anymore now that we use absolute time...
1497 //              AddToSoundTimeBase(USEC_TO_M6502_CYCLES(timeToNextEvent));
1498                 HandleNextEvent();
1499         }
1500
1501 #ifdef THREADED_65C02
1502 WriteLog("Main: cpuFinished = true;\n");
1503 cpuFinished = true;
1504 //#warning "If sound thread is behind, CPU thread will never wake up... !!! FIX !!!" [DONE]
1505 //What to do? How do you know when the CPU is sleeping???
1506 //USE A CONDITIONAL!!! OF COURSE!!!!!!11!11!11!!!1!
1507 #if 0
1508 SDL_mutexP(mainMutex);
1509 SDL_CondWait(mainCond, mainMutex);      // Wait for CPU thread to get to signal point...
1510 SDL_mutexV(mainMutex);
1511 #else
1512 //Nope, use a semaphore...
1513 WriteLog("Main: SDL_SemWait(mainSem);\n");
1514 SDL_SemWait(mainSem);//should lock until CPU thread is waiting...
1515 #endif
1516
1517 WriteLog("Main: SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up\n");
1518 SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up
1519 WriteLog("Main: SDL_WaitThread(cpuThread, NULL);\n");
1520 SDL_WaitThread(cpuThread, NULL);
1521 //nowok:SDL_WaitThread(CPUThreadFunc, NULL);
1522 WriteLog("Main: SDL_DestroyCond(cpuCond);\n");
1523 SDL_DestroyCond(cpuCond);
1524
1525 //SDL_DestroyMutex(mainMutex);
1526 SDL_DestroySemaphore(mainSem);
1527 #endif
1528
1529         if (settings.autoStateSaving)
1530         {
1531                 // Save state here...
1532                 SaveApple2State(settings.autoStatePath);
1533         }
1534 floppyDrive.SaveImage();
1535
1536         SoundDone();
1537         VideoDone();
1538         SaveSettings();
1539         LogDone();
1540
1541         return 0;
1542 }
1543
1544
1545 /*
1546 Apple II keycodes
1547 -----------------
1548
1549 Key     Aln CTL SHF BTH
1550 -----------------------
1551 space   $A0     $A0     $A0 $A0         No xlation
1552 RETURN  $8D     $8D     $8D     $8D             No xlation
1553 0               $B0     $B0     $B0     $B0             Need to screen shift+0 (?)
1554 1!              $B1 $B1 $A1 $A1         No xlation
1555 2"              $B2     $B2     $A2     $A2             No xlation
1556 3#              $B3     $B3     $A3     $A3             No xlation
1557 4$              $B4     $B4     $A4     $A4             No xlation
1558 5%              $B5     $B5     $A5     $A5             No xlation
1559 6&              $B6     $B6     $A6     $A6             No xlation
1560 7'              $B7     $B7     $A7     $A7             No xlation
1561 8(              $B8     $B8     $A8     $A8             No xlation
1562 9)              $B9     $B9     $A9     $A9             No xlation
1563 :*              $BA     $BA     $AA     $AA             No xlation
1564 ;+              $BB     $BB     $AB     $AB             No xlation
1565 ,<              $AC     $AC     $BC     $BC             No xlation
1566 -=              $AD     $AD     $BD     $BD             No xlation
1567 .>              $AE     $AE     $BE     $BE             No xlation
1568 /?              $AF     $AF     $BF     $BF             No xlation
1569 A               $C1     $81     $C1     $81
1570 B               $C2     $82     $C2     $82
1571 C               $C3     $83     $C3     $83
1572 D               $C4     $84     $C4     $84
1573 E               $C5     $85     $C5     $85
1574 F               $C6     $86     $C6     $86
1575 G               $C7     $87     $C7     $87
1576 H               $C8     $88     $C8     $88
1577 I               $C9     $89     $C9     $89
1578 J               $CA     $8A     $CA     $8A
1579 K               $CB     $8B     $CB     $8B
1580 L               $CC     $8C     $CC     $8C
1581 M               $CD     $8D     $DD     $9D             -> ODD
1582 N^              $CE     $8E     $DE     $9E             -> ODD
1583 O               $CF     $8F     $CF     $8F
1584 P@              $D0     $90     $C0     $80             Need to xlate CTL+SHFT+P & SHFT+P (?)
1585 Q               $D1     $91     $D1     $91
1586 R               $D2     $92     $D2     $92
1587 S               $D3     $93     $D3     $93
1588 T               $D4     $94     $D4     $94
1589 U               $D5     $95     $D5     $95
1590 V               $D6     $96     $D6     $96
1591 W               $D7     $97     $D7     $97
1592 X               $D8     $98     $D8     $98
1593 Y               $D9     $99     $D9     $99
1594 Z               $DA     $9A     $DA     $9A
1595 <-              $88     $88     $88     $88
1596 ->              $95     $95     $95     $95
1597 ESC             $9B     $9B     $9B     $9B             No xlation
1598
1599 */
1600 //static uint64_t lastCPUCycles = 0;
1601 static uint32_t frameCount = 0;
1602 static void FrameCallback(void)
1603 {
1604         SDL_Event event;
1605
1606         while (SDL_PollEvent(&event))
1607         {
1608                 switch (event.type)
1609                 {
1610 // Problem with using SDL_TEXTINPUT is that it causes key delay. :-/
1611                 case SDL_TEXTINPUT:
1612 //Need to do some key translation here, and screen out non-apple keys as well...
1613 //(really, could do it all in SDL_KEYDOWN, would just have to get symbols &
1614 // everything else done separately. this is slightly easier. :-P)
1615 //                      if (event.key.keysym.sym == SDLK_TAB)   // Prelim key screening...
1616                         if (event.edit.text[0] == '\t') // Prelim key screening...
1617                                 break;
1618
1619                         lastKeyPressed = event.edit.text[0];
1620                         keyDown = true;
1621
1622                         //kludge: should have a caps lock thingy here...
1623                         //or all uppercase for ][+...
1624 //                      if (lastKeyPressed >= 'a' && lastKeyPressed <='z')
1625 //                              lastKeyPressed &= 0xDF;         // Convert to upper case...
1626
1627                         break;
1628                 case SDL_KEYDOWN:
1629                         // CTRL+RESET key emulation (mapped to CTRL+`)
1630 // This doesn't work...
1631 //                      if (event.key.keysym.sym == SDLK_BREAK && (event.key.keysym.mod & KMOD_CTRL))
1632 //                      if (event.key.keysym.sym == SDLK_PAUSE && (event.key.keysym.mod & KMOD_CTRL))
1633                         if (event.key.keysym.sym == SDLK_BACKQUOTE && (event.key.keysym.mod & KMOD_CTRL))
1634 //NOTE that this shouldn't take place until the key is lifted... !!! FIX !!!
1635 //ALSO it seems to leave the machine in an inconsistent state vis-a-vis the language card...
1636                                 mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
1637
1638                         if (event.key.keysym.sym == SDLK_RIGHT)
1639                                 lastKeyPressed = 0x15, keyDown = true;
1640                         else if (event.key.keysym.sym == SDLK_LEFT)
1641                                 lastKeyPressed = 0x08, keyDown = true;
1642                         else if (event.key.keysym.sym == SDLK_UP)
1643                                 lastKeyPressed = 0x0B, keyDown = true;
1644                         else if (event.key.keysym.sym == SDLK_DOWN)
1645                                 lastKeyPressed = 0x0A, keyDown = true;
1646                         else if (event.key.keysym.sym == SDLK_RETURN)
1647                                 lastKeyPressed = 0x0D, keyDown = true;
1648                         else if (event.key.keysym.sym == SDLK_ESCAPE)
1649                                 lastKeyPressed = 0x1B, keyDown = true;
1650                         else if (event.key.keysym.sym == SDLK_BACKSPACE)
1651                                 lastKeyPressed = 0x7F, keyDown = true;
1652
1653                         // Fix CTRL+key combo...
1654                         if (event.key.keysym.mod & KMOD_CTRL)
1655                         {
1656                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
1657                                 {
1658                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 1;
1659                                         keyDown = true;
1660 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
1661                                 }
1662                         }
1663
1664                         // Use ALT+Q to exit, as well as the usual window decoration method
1665                         if (event.key.keysym.sym == SDLK_q && (event.key.keysym.mod & KMOD_ALT))
1666                                 running = false;
1667
1668                         if (event.key.keysym.sym == SDLK_PAUSE)
1669                         {
1670                                 pauseMode = !pauseMode;
1671
1672                                 if (pauseMode)
1673                                 {
1674                                         SoundPause();
1675                                         SpawnMessage("*** PAUSED ***");
1676                                 }
1677                                 else
1678                                 {
1679                                         SoundResume();
1680                                         SpawnMessage("*** RESUME ***");
1681                                 }
1682                         }
1683
1684                         // Paddle buttons 0 & 1
1685                         if (event.key.keysym.sym == SDLK_INSERT)
1686                                 openAppleDown = true;
1687                         if (event.key.keysym.sym == SDLK_PAGEUP)
1688                                 closedAppleDown = true;
1689
1690                         if (event.key.keysym.sym == SDLK_F11)
1691                                 dumpDis = !dumpDis;                             // Toggle the disassembly process
1692 //                      else if (event.key.keysym.sym == SDLK_F11)
1693 //                              floppyDrive.LoadImage("./disks/bt1_char.dsk");//Kludge to load char disk...
1694 else if (event.key.keysym.sym == SDLK_F9)
1695 {
1696         floppyDrive.CreateBlankImage();
1697 //      SpawnMessage("Image cleared...");
1698 }//*/
1699 else if (event.key.keysym.sym == SDLK_F10)
1700 {
1701         floppyDrive.SwapImages();
1702 //      SpawnMessage("Image swapped...");
1703 }//*/
1704
1705                         if (event.key.keysym.sym == SDLK_F2)// Toggle the palette
1706                                 TogglePalette();
1707                         else if (event.key.keysym.sym == SDLK_F3)// Cycle through screen types
1708                                 CycleScreenTypes();
1709
1710 //                      if (event.key.keysym.sym == SDLK_F5)    // Temp GUI launch key
1711                         if (event.key.keysym.sym == SDLK_F1)    // GUI launch key
1712 //NOTE: Should parse the output to determine whether or not the user requested
1713 //      to quit completely... !!! FIX !!!
1714                                 gui->Run();
1715
1716                         if (event.key.keysym.sym == SDLK_F5)
1717                         {
1718                                 VolumeDown();
1719                                 char volStr[19] = "[****************]";
1720 //                              volStr[GetVolume()] = 0;
1721                                 for(int i=GetVolume(); i<16; i++)
1722                                         volStr[1 + i] = '-';
1723                                 SpawnMessage("Volume: %s", volStr);
1724                         }
1725                         else if (event.key.keysym.sym == SDLK_F6)
1726                         {
1727                                 VolumeUp();
1728                                 char volStr[19] = "[****************]";
1729 //                              volStr[GetVolume()] = 0;
1730                                 for(int i=GetVolume(); i<16; i++)
1731                                         volStr[1 + i] = '-';
1732                                 SpawnMessage("Volume: %s", volStr);
1733                         }
1734
1735                         static bool fullscreenDebounce = false;
1736
1737                         if (event.key.keysym.sym == SDLK_F12)
1738                         {
1739                                 if (!fullscreenDebounce)
1740                                 {
1741                                         ToggleFullScreen();
1742                                         fullscreenDebounce = true;
1743                                 }
1744                         }
1745 //                      else
1746
1747                         break;
1748                 case SDL_KEYUP:
1749                         if (event.key.keysym.sym == SDLK_F12)
1750                                 fullscreenDebounce = false;
1751
1752                         // Paddle buttons 0 & 1
1753                         if (event.key.keysym.sym == SDLK_INSERT)
1754                                 openAppleDown = false;
1755                         if (event.key.keysym.sym == SDLK_PAGEUP)
1756                                 closedAppleDown = false;
1757
1758 //                      if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
1759 //                              keyDown = false;
1760
1761                         break;
1762                 case SDL_QUIT:
1763                         running = false;
1764                 }
1765         }
1766
1767 //#warning "!!! Taking MAJOR time hit with the video frame rendering !!!"
1768         RenderVideoFrame();
1769         SetCallbackTime(FrameCallback, 16666.66666667);
1770
1771 #ifdef CPU_CLOCK_CHECKING
1772 //We know it's stopped, so we can get away with this...
1773 counter++;
1774 if (counter == 60)
1775 {
1776         uint64_t clock = GetCurrentV65C02Clock();
1777 //totalCPU += (uint32_t)(clock - lastClock);
1778
1779         printf("Executed %u cycles...\n", (uint32_t)(clock - lastClock));
1780         lastClock = clock;
1781 //      totalCPU = 0;
1782         counter = 0;
1783 }
1784 #endif
1785 //Instead of this, we should yield remaining time to other processes... !!! FIX !!! [DONE]
1786 //lessee...
1787 //nope.
1788 //Actually, slows things down too much...
1789 //SDL_Delay(10);
1790 //      while (SDL_GetTicks() - startTicks < 16);       // Wait for next frame...
1791
1792 // This is the problem: If you set the interval to 16, it runs faster than
1793 // 1/60s per frame. If you set it to 17, it runs slower. What we need is to
1794 // have it do 16 for one frame, then 17 for two others. Then it should average
1795 // out to 1/60s per frame every 3 frames.
1796         frameCount = (frameCount + 1) % 3;
1797
1798         uint32_t waitFrameTime = 17 - (frameCount == 0 ? 1 : 0);
1799
1800         while (SDL_GetTicks() - startTicks < waitFrameTime)
1801                 SDL_Delay(1);                                                   // Wait for next frame...
1802
1803         startTicks = SDL_GetTicks();
1804 #if 0
1805         uint64_t cpuCycles = GetCurrentV65C02Clock();
1806         uint32_t cyclesBurned = (uint32_t)(cpuCycles - lastCPUCycles);
1807         WriteLog("FrameCallback: used %i cycles\n", cyclesBurned);
1808         lastCPUCycles = cpuCycles;
1809 #endif
1810
1811 //let's wait, then signal...
1812 //works longer, but then still falls behind...
1813 #ifdef THREADED_65C02
1814         if (!pauseMode)
1815                 SDL_CondSignal(cpuCond);//OK, let the CPU go another frame...
1816 #endif
1817 }
1818
1819
1820 static void BlinkTimer(void)
1821 {
1822         flash = !flash;
1823         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 sec intervals
1824 }
1825
1826
1827 /*
1828 Next problem is this: How to have events occur and synchronize with the rest
1829 of the threads?
1830
1831   o Have the CPU thread manage the timer mechanism? (need to have a method of carrying
1832     remainder CPU cycles over...)
1833
1834 One way would be to use a fractional accumulator, then subtract 1 every
1835 time it overflows. Like so:
1836
1837 double overflow = 0;
1838 uint32_t time = 20;
1839 while (!done)
1840 {
1841         Execute6808(&soundCPU, time);
1842         overflow += 0.289115646;
1843         if (overflow > 1.0)
1844         {
1845                 overflow -= 1.0;
1846                 time = 21;
1847         }
1848         else
1849                 time = 20;
1850 }
1851 */