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

   1 //
   2 // Apple 2 SDL Portable Apple Emulator
   3 //
   4 // by James Hammons
   5 // © 2014 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
  56 // Debug and misc. defines
  57
  58 #define THREADED_65C02
  59 #define CPU_THREAD_OVERFLOW_COMPENSATION
  60 #define DEBUG_LC
  61 //#define CPU_CLOCK_CHECKING
  62 //#define THREAD_DEBUGGING
  63 #define SOFT_SWITCH_DEBUGGING
  64
  65 // Global variables
  66
  67 uint8_t ram[0x10000], rom[0x10000];                     // RAM & ROM spaces
  68 uint8_t ram2[0x10000];                                          // Auxillary RAM
  69 //uint8_t diskRom[0x100];                                               // Disk ROM space
  70 V65C02REGS mainCPU;                                                     // v65C02 execution context
  71 uint8_t appleType = APPLE_TYPE_IIE;
  72 FloppyDrive floppyDrive;
  73 //bool powerOnState = true;                                     // Virtual power switch
  74 bool powerStateChangeRequested = false;
  75
  76 // Local variables
  77
  78 uint8_t lastKeyPressed = 0;
  79 bool keyDown = false;
  80 bool openAppleDown = false;
  81 bool closedAppleDown = false;
  82 bool store80Mode = false;
  83 bool vbl = false;
  84 bool slotCXROM = false;
  85 bool slotC3ROM = false;
  86 bool ramrd = false;
  87 bool ramwrt = false;
  88 bool altzp = false;
  89 bool ioudis = true;
  90 bool dhires = false;
  91 // Language card state (ROM read, no write)
  92 uint8_t lcState = 0x02;
  93
  94 static bool running = true;                                     // Machine running state flag...
  95 static uint32_t startTicks;
  96 static bool pauseMode = false;
  97 static bool fullscreenDebounce = false;
  98 static bool capsLock = false;
  99 static bool capsLockDebounce = false;
 100
 101 // Local functions (technically, they're global...)
 102
 103 bool LoadImg(char * filename, uint8_t * ram, int size);
 104 static void SaveApple2State(const char * filename);
 105 static bool LoadApple2State(const char * filename);
 106 static void ResetApple2State(void);
 107
 108 // Local timer callback functions
 109
 110 static void FrameCallback(void);
 111 static void BlinkTimer(void);
 112
 113 #ifdef THREADED_65C02
 114 // Test of threaded execution of 6502
 115 static SDL_Thread * cpuThread = NULL;
 116 //static SDL_mutex * cpuMutex = NULL;
 117 static SDL_cond * cpuCond = NULL;
 118 static SDL_sem * mainSem = NULL;
 119 static bool cpuFinished = false;
 120 static bool cpuSleep = false;
 121
 122 // NB: Apple //e Manual sez 6502 is running @ 1,022,727 Hz
 123
 124 // Let's try a thread...
 125 /*
 126 Here's how it works: Execute 1 frame's worth, then sleep.
 127 Other stuff wakes it up
 128 */
 129 int CPUThreadFunc(void * data)
 130 {
 131         // Mutex must be locked for conditional to work...
 132         // Also, must be created in the thread that uses it...
 133         SDL_mutex * cpuMutex = SDL_CreateMutex();
 134
 135 // decrement mainSem...
 136 //SDL_SemWait(mainSem);
 137 #ifdef CPU_THREAD_OVERFLOW_COMPENSATION
 138         float overflow = 0.0;
 139 #endif
 140
 141         do
 142         {
 143                 if (cpuSleep)
 144                         SDL_CondWait(cpuCond, cpuMutex);
 145
 146 // decrement mainSem...
 147 #ifdef THREAD_DEBUGGING
 148 WriteLog("CPU: SDL_SemWait(mainSem);\n");
 149 #endif
 150 SDL_SemWait(mainSem);
 151
 152 // There are exactly 800 slices of 21.333 cycles per frame, so it works out
 153 // evenly.
 154 #if 0
 155                 uint32_t cycles = 17066;
 156 #ifdef CPU_THREAD_OVERFLOW_COMPENSATION
 157 // ODD! It's closer *without* this overflow compensation. ??? WHY ???
 158                 overflow += 0.666666667;
 159
 160                 if (overflow > 1.0)
 161                 {
 162                         overflow -= 1.0;
 163                         cycles++;
 164                 }
 165 #endif
 166
 167 #ifdef THREAD_DEBUGGING
 168 WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
 169 #endif
 170                 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!
 171
 172                 // Adjust the sound routine's last cycle toggled time base
 173                 // Also, since we're finished executing, .clock is now valid
 174 #ifdef THREAD_DEBUGGING
 175 WriteLog("CPU: AdjustLastToggleCycles(mainCPU.clock);\n");
 176 #endif
 177                 AdjustLastToggleCycles(mainCPU.clock);
 178 #else
 179 #ifdef THREAD_DEBUGGING
 180 WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
 181 #endif
 182                 for(int i=0; i<800; i++)
 183                 {
 184                         uint32_t cycles = 21;
 185                         overflow += 0.333333334;
 186
 187                         if (overflow > 1.0)
 188                         {
 189                                 cycles++;
 190                                 overflow -= 1.0;
 191                         }
 192
 193                         Execute65C02(&mainCPU, cycles);
 194                         WriteSampleToBuffer();
 195
 196                         // Dunno if this is correct (seems to be close enough)...
 197                         vbl = (i < 670 ? true : false);
 198                 }
 199 #endif
 200
 201 #ifdef THREAD_DEBUGGING
 202 WriteLog("CPU: SDL_mutexP(cpuMutex);\n");
 203 #endif
 204                 SDL_mutexP(cpuMutex);
 205 // increment mainSem...
 206 #ifdef THREAD_DEBUGGING
 207 WriteLog("CPU: SDL_SemPost(mainSem);\n");
 208 #endif
 209                 SDL_SemPost(mainSem);
 210 #ifdef THREAD_DEBUGGING
 211 WriteLog("CPU: SDL_CondWait(cpuCond, cpuMutex);\n");
 212 #endif
 213                 SDL_CondWait(cpuCond, cpuMutex);
 214
 215 #ifdef THREAD_DEBUGGING
 216 WriteLog("CPU: SDL_mutexV(cpuMutex);\n");
 217 #endif
 218                 SDL_mutexV(cpuMutex);
 219         }
 220         while (!cpuFinished);
 221
 222         SDL_DestroyMutex(cpuMutex);
 223
 224         return 0;
 225 }
 226 #endif
 227
 228
 229 #if 1
 230 //
 231 // Request a change in the power state of the emulated Apple
 232 //
 233 void SetPowerState(void)
 234 {
 235 //      powerOnState = state;
 236 //      pauseMode = !state;
 237
 238 //      if (!pauseMode)
 239 //      {
 240 //printf("Turning on...\n");
 241                 // Transitioning from OFF to ON
 242 //              mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 243 //              SoundResume();
 244 //      }
 245 //      else
 246 //      {
 247 //printf("Turning off...\n");
 248                 // Turn it off...
 249 //              SoundPause();
 250 //      }
 251         powerStateChangeRequested = true;
 252 }
 253 #endif
 254
 255
 256 //
 257 // Load a file into RAM/ROM image space
 258 //
 259 bool LoadImg(char * filename, uint8_t * ram, int size)
 260 {
 261         FILE * fp = fopen(filename, "rb");
 262
 263         if (fp == NULL)
 264                 return false;
 265
 266         fread(ram, 1, size, fp);
 267         fclose(fp);
 268
 269         return true;
 270 }
 271
 272
 273 static void SaveApple2State(const char * filename)
 274 {
 275 }
 276
 277
 278 static bool LoadApple2State(const char * filename)
 279 {
 280         return false;
 281 }
 282
 283
 284 static void ResetApple2State(void)
 285 {
 286         keyDown = false;
 287         openAppleDown = false;
 288         closedAppleDown = false;
 289         store80Mode = false;
 290         vbl = false;
 291         slotCXROM = false;
 292         slotC3ROM = false;
 293         ramrd = false;
 294         ramwrt = false;
 295         altzp = false;
 296         ioudis = true;
 297         dhires = false;
 298         lcState = 0x02;
 299 //      SwitchLC();                     // Make sure MMU is in sane state
 300 //NOPE, does nothing    SetupAddressMap();
 301         ResetMMUPointers();
 302
 303         // Without this, you can wedge the system :-/
 304         memset(ram, 0, 0x10000);
 305 //      memset(ram2, 0, 0x10000);
 306         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 307 }
 308
 309
 310 #ifdef CPU_CLOCK_CHECKING
 311 uint8_t counter = 0;
 312 uint32_t totalCPU = 0;
 313 uint64_t lastClock = 0;
 314 #endif
 315 //
 316 // Main loop
 317 //
 318 int main(int /*argc*/, char * /*argv*/[])
 319 {
 320         InitLog("./apple2.log");
 321         LoadSettings();
 322         srand(time(NULL));                                                                      // Initialize RNG
 323
 324         // Zero out memory
 325         memset(ram, 0, 0x10000);
 326         memset(rom, 0, 0x10000);
 327         memset(ram2, 0, 0x10000);
 328
 329         // Set up MMU
 330         SetupAddressMap();
 331         ResetMMUPointers();
 332
 333         // Set up V65C02 execution context
 334         memset(&mainCPU, 0, sizeof(V65C02REGS));
 335         mainCPU.RdMem = AppleReadMem;
 336         mainCPU.WrMem = AppleWriteMem;
 337         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 338
 339 //      alternateCharset = true;
 340 //      if (!LoadImg(settings.BIOSPath, rom + 0xD000, 0x3000))
 341         if (!LoadImg(settings.BIOSPath, rom + 0xC000, 0x4000))
 342         {
 343                 WriteLog("Could not open file '%s'!\n", settings.BIOSPath);
 344                 return -1;
 345         }
 346
 347 //Load up disk image from config file (for now)...
 348         floppyDrive.LoadImage(settings.diskImagePath1, 0);
 349         floppyDrive.LoadImage(settings.diskImagePath2, 1);
 350 //      floppyDrive.LoadImage("./disks/temp.nib", 1);   // Load temp .nib file into second drive...
 351
 352         WriteLog("About to initialize video...\n");
 353
 354         if (!InitVideo())
 355         {
 356                 std::cout << "Aborting!" << std::endl;
 357                 return -1;
 358         }
 359
 360         GUI::Init(sdlRenderer);
 361
 362         // Have to do this *after* video init but *before* sound init...!
 363 //Shouldn't be necessary since we're not doing emulation in the ISR...
 364         if (settings.autoStateSaving)
 365         {
 366                 // Load last state from file...
 367                 if (!LoadApple2State(settings.autoStatePath))
 368                         WriteLog("Unable to use Apple2 state file \"%s\"!\n", settings.autoStatePath);
 369         }
 370
 371         WriteLog("About to initialize audio...\n");
 372         SoundInit();
 373         SetupBlurTable();                                                       // Set up the color TV emulation blur table
 374         running = true;                                                         // Set running status...
 375         InitializeEventList();                                          // Clear the event list before we use it...
 376         SetCallbackTime(FrameCallback, 16666.66666667); // Set frame to fire at 1/60 s interval
 377         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 s intervals
 378         startTicks = SDL_GetTicks();
 379
 380 #ifdef THREADED_65C02
 381         cpuCond = SDL_CreateCond();
 382         mainSem = SDL_CreateSemaphore(1);
 383         cpuThread = SDL_CreateThread(CPUThreadFunc, NULL, NULL);
 384 //Hmm... CPU does POST (+1), wait, then WAIT (-1)
 385 //      SDL_sem * mainMutex = SDL_CreateMutex();
 386 #endif
 387
 388         WriteLog("Entering main loop...\n");
 389
 390         while (running)
 391         {
 392                 double timeToNextEvent = GetTimeToNextEvent();
 393 #ifndef THREADED_65C02
 394                 Execute65C02(&mainCPU, USEC_TO_M6502_CYCLES(timeToNextEvent));
 395 #endif
 396
 397 #ifdef CPU_CLOCK_CHECKING
 398 #ifndef THREADED_65C02
 399 totalCPU += USEC_TO_M6502_CYCLES(timeToNextEvent);
 400 #endif
 401 #endif
 402                 HandleNextEvent();
 403         }
 404
 405 #ifdef THREADED_65C02
 406 WriteLog("Main: cpuFinished = true;\n");
 407 cpuFinished = true;
 408 //#warning "If sound thread is behind, CPU thread will never wake up... !!! FIX !!!" [DONE]
 409 //What to do? How do you know when the CPU is sleeping???
 410 //USE A CONDITIONAL!!! OF COURSE!!!!!!11!11!11!!!1!
 411 //Nope, use a semaphore...
 412 WriteLog("Main: SDL_SemWait(mainSem);\n");
 413 SDL_SemWait(mainSem);//should lock until CPU thread is waiting...
 414 #endif
 415
 416 WriteLog("Main: SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up\n");
 417 SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up
 418 WriteLog("Main: SDL_WaitThread(cpuThread, NULL);\n");
 419 SDL_WaitThread(cpuThread, NULL);
 420 //nowok:SDL_WaitThread(CPUThreadFunc, NULL);
 421 WriteLog("Main: SDL_DestroyCond(cpuCond);\n");
 422 SDL_DestroyCond(cpuCond);
 423
 424 SDL_DestroySemaphore(mainSem);
 425
 426         if (settings.autoStateSaving)
 427         {
 428                 // Save state here...
 429                 SaveApple2State(settings.autoStatePath);
 430         }
 431 floppyDrive.SaveImage(0);
 432 floppyDrive.SaveImage(1);
 433
 434         SoundDone();
 435         VideoDone();
 436         SaveSettings();
 437         LogDone();
 438
 439         return 0;
 440 }
 441
 442
 443 /*
 444 Apple II keycodes
 445 -----------------
 446
 447 Key     Aln CTL SHF BTH
 448 -----------------------
 449 space   $A0     $A0     $A0 $A0         No xlation
 450 RETURN  $8D     $8D     $8D     $8D             No xlation
 451 0               $B0     $B0     $B0     $B0             Need to screen shift+0 (?)
 452 1!              $B1 $B1 $A1 $A1         No xlation
 453 2"              $B2     $B2     $A2     $A2             No xlation
 454 3#              $B3     $B3     $A3     $A3             No xlation
 455 4$              $B4     $B4     $A4     $A4             No xlation
 456 5%              $B5     $B5     $A5     $A5             No xlation
 457 6&              $B6     $B6     $A6     $A6             No xlation
 458 7'              $B7     $B7     $A7     $A7             No xlation
 459 8(              $B8     $B8     $A8     $A8             No xlation
 460 9)              $B9     $B9     $A9     $A9             No xlation
 461 :*              $BA     $BA     $AA     $AA             No xlation
 462 ;+              $BB     $BB     $AB     $AB             No xlation
 463 ,<              $AC     $AC     $BC     $BC             No xlation
 464 -=              $AD     $AD     $BD     $BD             No xlation
 465 .>              $AE     $AE     $BE     $BE             No xlation
 466 /?              $AF     $AF     $BF     $BF             No xlation
 467 A               $C1     $81     $C1     $81
 468 B               $C2     $82     $C2     $82
 469 C               $C3     $83     $C3     $83
 470 D               $C4     $84     $C4     $84
 471 E               $C5     $85     $C5     $85
 472 F               $C6     $86     $C6     $86
 473 G               $C7     $87     $C7     $87
 474 H               $C8     $88     $C8     $88
 475 I               $C9     $89     $C9     $89
 476 J               $CA     $8A     $CA     $8A
 477 K               $CB     $8B     $CB     $8B
 478 L               $CC     $8C     $CC     $8C
 479 M               $CD     $8D     $DD     $9D             -> ODD
 480 N^              $CE     $8E     $DE     $9E             -> ODD
 481 O               $CF     $8F     $CF     $8F
 482 P@              $D0     $90     $C0     $80             Need to xlate CTL+SHFT+P & SHFT+P (?)
 483 Q               $D1     $91     $D1     $91
 484 R               $D2     $92     $D2     $92
 485 S               $D3     $93     $D3     $93
 486 T               $D4     $94     $D4     $94
 487 U               $D5     $95     $D5     $95
 488 V               $D6     $96     $D6     $96
 489 W               $D7     $97     $D7     $97
 490 X               $D8     $98     $D8     $98
 491 Y               $D9     $99     $D9     $99
 492 Z               $DA     $9A     $DA     $9A
 493 <-              $88     $88     $88     $88
 494 ->              $95     $95     $95     $95
 495 ESC             $9B     $9B     $9B     $9B             No xlation
 496
 497 */
 498 //static uint64_t lastCPUCycles = 0;
 499 static uint32_t frameCount = 0;
 500 static void FrameCallback(void)
 501 {
 502         SDL_Event event;
 503
 504         while (SDL_PollEvent(&event))
 505         {
 506                 switch (event.type)
 507                 {
 508 // Problem with using SDL_TEXTINPUT is that it causes key delay. :-/
 509 #if 0
 510                 case SDL_TEXTINPUT:
 511 //Need to do some key translation here, and screen out non-apple keys as well...
 512 //(really, could do it all in SDL_KEYDOWN, would just have to get symbols &
 513 // everything else done separately. this is slightly easier. :-P)
 514 //                      if (event.key.keysym.sym == SDLK_TAB)   // Prelim key screening...
 515                         if (event.edit.text[0] == '\t') // Prelim key screening...
 516                                 break;
 517
 518                         lastKeyPressed = event.edit.text[0];
 519                         keyDown = true;
 520
 521                         //kludge: should have a caps lock thingy here...
 522                         //or all uppercase for ][+...
 523 //                      if (lastKeyPressed >= 'a' && lastKeyPressed <='z')
 524 //                              lastKeyPressed &= 0xDF;         // Convert to upper case...
 525
 526                         break;
 527 #endif
 528                 case SDL_KEYDOWN:
 529                         // Use ALT+Q to exit, as well as the usual window decoration method
 530                         if (event.key.keysym.sym == SDLK_q && (event.key.keysym.mod & KMOD_ALT))
 531                                 running = false;
 532
 533                         // CTRL+RESET key emulation (mapped to CTRL+`)
 534 // This doesn't work...
 535 //                      if (event.key.keysym.sym == SDLK_BREAK && (event.key.keysym.mod & KMOD_CTRL))
 536 //                      if (event.key.keysym.sym == SDLK_PAUSE && (event.key.keysym.mod & KMOD_CTRL))
 537                         if (event.key.keysym.sym == SDLK_BACKQUOTE && (event.key.keysym.mod & KMOD_CTRL))
 538                         {
 539 //NOTE that this shouldn't take place until the key is lifted... !!! FIX !!!
 540 //ALSO it seems to leave the machine in an inconsistent state vis-a-vis the language card...
 541                                 mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 542                                 break;
 543                         }
 544
 545                         if (event.key.keysym.sym == SDLK_RIGHT)
 546                                 lastKeyPressed = 0x15, keyDown = true;
 547                         else if (event.key.keysym.sym == SDLK_LEFT)
 548                                 lastKeyPressed = 0x08, keyDown = true;
 549                         else if (event.key.keysym.sym == SDLK_UP)
 550                                 lastKeyPressed = 0x0B, keyDown = true;
 551                         else if (event.key.keysym.sym == SDLK_DOWN)
 552                                 lastKeyPressed = 0x0A, keyDown = true;
 553                         else if (event.key.keysym.sym == SDLK_RETURN)
 554                                 lastKeyPressed = 0x0D, keyDown = true;
 555                         else if (event.key.keysym.sym == SDLK_ESCAPE)
 556                                 lastKeyPressed = 0x1B, keyDown = true;
 557                         else if (event.key.keysym.sym == SDLK_BACKSPACE)
 558                                 lastKeyPressed = 0x7F, keyDown = true;
 559
 560                         // Fix CTRL+key combo...
 561                         if (event.key.keysym.mod & KMOD_CTRL)
 562                         {
 563                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 564                                 {
 565                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 1;
 566                                         keyDown = true;
 567 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
 568                                         break;
 569                                 }
 570                         }
 571
 572 #if 1
 573                         // Fix SHIFT+key combo...
 574                         if (event.key.keysym.mod & KMOD_SHIFT)
 575                         {
 576                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 577                                 {
 578                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 0x41;
 579                                         keyDown = true;
 580 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
 581                                         break;
 582                                 }
 583                                 else if (event.key.keysym.sym == SDLK_1)
 584                                 {
 585                                         lastKeyPressed = '!';
 586                                         keyDown = true;
 587                                         break;
 588                                 }
 589                                 else if (event.key.keysym.sym == SDLK_2)
 590                                 {
 591                                         lastKeyPressed = '@';
 592                                         keyDown = true;
 593                                         break;
 594                                 }
 595                                 else if (event.key.keysym.sym == SDLK_3)
 596                                 {
 597                                         lastKeyPressed = '#';
 598                                         keyDown = true;
 599                                         break;
 600                                 }
 601                                 else if (event.key.keysym.sym == SDLK_3)
 602                                 {
 603                                         lastKeyPressed = '#';
 604                                         keyDown = true;
 605                                         break;
 606                                 }
 607                                 else if (event.key.keysym.sym == SDLK_4)
 608                                 {
 609                                         lastKeyPressed = '$';
 610                                         keyDown = true;
 611                                         break;
 612                                 }
 613                                 else if (event.key.keysym.sym == SDLK_5)
 614                                 {
 615                                         lastKeyPressed = '%';
 616                                         keyDown = true;
 617                                         break;
 618                                 }
 619                                 else if (event.key.keysym.sym == SDLK_6)
 620                                 {
 621                                         lastKeyPressed = '^';
 622                                         keyDown = true;
 623                                         break;
 624                                 }
 625                                 else if (event.key.keysym.sym == SDLK_7)
 626                                 {
 627                                         lastKeyPressed = '&';
 628                                         keyDown = true;
 629                                         break;
 630                                 }
 631                                 else if (event.key.keysym.sym == SDLK_8)
 632                                 {
 633                                         lastKeyPressed = '*';
 634                                         keyDown = true;
 635                                         break;
 636                                 }
 637                                 else if (event.key.keysym.sym == SDLK_9)
 638                                 {
 639                                         lastKeyPressed = '(';
 640                                         keyDown = true;
 641                                         break;
 642                                 }
 643                                 else if (event.key.keysym.sym == SDLK_0)
 644                                 {
 645                                         lastKeyPressed = ')';
 646                                         keyDown = true;
 647                                         break;
 648                                 }
 649                                 else if (event.key.keysym.sym == SDLK_MINUS)
 650                                 {
 651                                         lastKeyPressed = '_';
 652                                         keyDown = true;
 653                                         break;
 654                                 }
 655                                 else if (event.key.keysym.sym == SDLK_EQUALS)
 656                                 {
 657                                         lastKeyPressed = '+';
 658                                         keyDown = true;
 659                                         break;
 660                                 }
 661                                 else if (event.key.keysym.sym == SDLK_LEFTBRACKET)
 662                                 {
 663                                         lastKeyPressed = '{';
 664                                         keyDown = true;
 665                                         break;
 666                                 }
 667                                 else if (event.key.keysym.sym == SDLK_RIGHTBRACKET)
 668                                 {
 669                                         lastKeyPressed = '}';
 670                                         keyDown = true;
 671                                         break;
 672                                 }
 673                                 else if (event.key.keysym.sym == SDLK_BACKSLASH)
 674                                 {
 675                                         lastKeyPressed = '|';
 676                                         keyDown = true;
 677                                         break;
 678                                 }
 679                                 else if (event.key.keysym.sym == SDLK_SEMICOLON)
 680                                 {
 681                                         lastKeyPressed = ':';
 682                                         keyDown = true;
 683                                         break;
 684                                 }
 685                                 else if (event.key.keysym.sym == SDLK_QUOTE)
 686                                 {
 687                                         lastKeyPressed = '"';
 688                                         keyDown = true;
 689                                         break;
 690                                 }
 691                                 else if (event.key.keysym.sym == SDLK_COMMA)
 692                                 {
 693                                         lastKeyPressed = '<';
 694                                         keyDown = true;
 695                                         break;
 696                                 }
 697                                 else if (event.key.keysym.sym == SDLK_PERIOD)
 698                                 {
 699                                         lastKeyPressed = '>';
 700                                         keyDown = true;
 701                                         break;
 702                                 }
 703                                 else if (event.key.keysym.sym == SDLK_SLASH)
 704                                 {
 705                                         lastKeyPressed = '?';
 706                                         keyDown = true;
 707                                         break;
 708                                 }
 709                                 else if (event.key.keysym.sym == SDLK_BACKQUOTE)
 710                                 {
 711                                         lastKeyPressed = '~';
 712                                         keyDown = true;
 713                                         break;
 714                                 }
 715                         }
 716 #endif
 717
 718                         // General keys...
 719                         if (event.key.keysym.sym >= SDLK_SPACE && event.key.keysym.sym <= SDLK_z)
 720                         {
 721                                 lastKeyPressed = event.key.keysym.sym;
 722                                 keyDown = true;
 723
 724                                 // Check for Caps Lock key...
 725                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z && capsLock)
 726                                         lastKeyPressed -= 0x20;
 727
 728                                 break;
 729                         }
 730
 731                         if (event.key.keysym.sym == SDLK_PAUSE)
 732                         {
 733                                 pauseMode = !pauseMode;
 734
 735                                 if (pauseMode)
 736                                 {
 737                                         SoundPause();
 738                                         SpawnMessage("*** PAUSED ***");
 739                                 }
 740                                 else
 741                                 {
 742                                         SoundResume();
 743                                         SpawnMessage("*** RESUME ***");
 744                                 }
 745                         }
 746
 747                         // Paddle buttons 0 & 1
 748                         if (event.key.keysym.sym == SDLK_INSERT)
 749                                 openAppleDown = true;
 750                         if (event.key.keysym.sym == SDLK_PAGEUP)
 751                                 closedAppleDown = true;
 752
 753                         if (event.key.keysym.sym == SDLK_F11)
 754                                 dumpDis = !dumpDis;                             // Toggle the disassembly process
 755
 756 /*else if (event.key.keysym.sym == SDLK_F9)
 757 {
 758         floppyDrive.CreateBlankImage(0);
 759 //      SpawnMessage("Image cleared...");
 760 }//*/
 761 /*else if (event.key.keysym.sym == SDLK_F10)
 762 {
 763         floppyDrive.SwapImages();
 764 //      SpawnMessage("Image swapped...");
 765 }//*/
 766
 767                         if (event.key.keysym.sym == SDLK_F2)// Toggle the palette
 768                                 TogglePalette();
 769                         else if (event.key.keysym.sym == SDLK_F3)// Cycle through screen types
 770                                 CycleScreenTypes();
 771                         else if (event.key.keysym.sym == SDLK_F5)
 772                         {
 773                                 VolumeDown();
 774                                 char volStr[19] = "[****************]";
 775 //                              volStr[GetVolume()] = 0;
 776                                 for(int i=GetVolume(); i<16; i++)
 777                                         volStr[1 + i] = '-';
 778                                 SpawnMessage("Volume: %s", volStr);
 779                         }
 780                         else if (event.key.keysym.sym == SDLK_F6)
 781                         {
 782                                 VolumeUp();
 783                                 char volStr[19] = "[****************]";
 784 //                              volStr[GetVolume()] = 0;
 785                                 for(int i=GetVolume(); i<16; i++)
 786                                         volStr[1 + i] = '-';
 787                                 SpawnMessage("Volume: %s", volStr);
 788                         }
 789                         else if (event.key.keysym.sym == SDLK_F12)
 790                         {
 791                                 if (!fullscreenDebounce)
 792                                 {
 793                                         ToggleFullScreen();
 794                                         fullscreenDebounce = true;
 795                                 }
 796                         }
 797
 798                         if (event.key.keysym.sym == SDLK_CAPSLOCK)
 799                         {
 800                                 if (!capsLockDebounce)
 801                                 {
 802                                         capsLock = !capsLock;
 803                                         capsLockDebounce = true;
 804                                 }
 805                         }
 806
 807                         break;
 808                 case SDL_KEYUP:
 809                         if (event.key.keysym.sym == SDLK_F12)
 810                                 fullscreenDebounce = false;
 811                         if (event.key.keysym.sym == SDLK_CAPSLOCK)
 812                                 capsLockDebounce = false;
 813
 814                         // Paddle buttons 0 & 1
 815                         if (event.key.keysym.sym == SDLK_INSERT)
 816                                 openAppleDown = false;
 817                         if (event.key.keysym.sym == SDLK_PAGEUP)
 818                                 closedAppleDown = false;
 819
 820 //                      if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 821 //                              keyDown = false;
 822
 823                         break;
 824                 case SDL_MOUSEBUTTONDOWN:
 825                         GUI::MouseDown(event.motion.x, event.motion.y, event.motion.state);
 826                         break;
 827                 case SDL_MOUSEBUTTONUP:
 828                         GUI::MouseUp(event.motion.x, event.motion.y, event.motion.state);
 829                         break;
 830                 case SDL_MOUSEMOTION:
 831                         GUI::MouseMove(event.motion.x, event.motion.y, event.motion.state);
 832                         break;
 833                 case SDL_WINDOWEVENT:
 834                         if (event.window.event == SDL_WINDOWEVENT_LEAVE)
 835                                 GUI::MouseMove(0, 0, 0);
 836
 837                         break;
 838                 case SDL_QUIT:
 839                         running = false;
 840                 }
 841         }
 842
 843         // Handle power request from the GUI
 844         if (powerStateChangeRequested)
 845         {
 846                 if (GUI::powerOnState)
 847                 {
 848                         pauseMode = false;
 849                         SoundResume();
 850                         ResetApple2State();
 851                 }
 852                 else
 853                 {
 854                         pauseMode = true;
 855                         SoundPause();
 856 //NOPE                  SDL_SemWait(mainSem);//should lock until CPU thread is waiting...
 857 //                      ResetApple2State();
 858                 }
 859
 860                 powerStateChangeRequested = false;
 861         }
 862
 863 //#warning "!!! Taking MAJOR time hit with the video frame rendering !!!"
 864 //      if (!pauseMode)
 865         {
 866                 RenderVideoFrame();
 867         }
 868
 869         RenderScreenBuffer();
 870         GUI::Render(sdlRenderer);
 871         SDL_RenderPresent(sdlRenderer);
 872         SetCallbackTime(FrameCallback, 16666.66666667);
 873
 874 #ifdef CPU_CLOCK_CHECKING
 875 //We know it's stopped, so we can get away with this...
 876 counter++;
 877 if (counter == 60)
 878 {
 879         uint64_t clock = GetCurrentV65C02Clock();
 880 //totalCPU += (uint32_t)(clock - lastClock);
 881
 882         printf("Executed %u cycles...\n", (uint32_t)(clock - lastClock));
 883         lastClock = clock;
 884 //      totalCPU = 0;
 885         counter = 0;
 886 }
 887 #endif
 888
 889 // This is the problem: If you set the interval to 16, it runs faster than
 890 // 1/60s per frame. If you set it to 17, it runs slower. What we need is to
 891 // have it do 16 for one frame, then 17 for two others. Then it should average
 892 // out to 1/60s per frame every 3 frames.
 893         frameCount = (frameCount + 1) % 3;
 894         uint32_t waitFrameTime = 17 - (frameCount == 0 ? 1 : 0);
 895
 896         // Wait for next frame...
 897         while (SDL_GetTicks() - startTicks < waitFrameTime)
 898                 SDL_Delay(1);
 899
 900         startTicks = SDL_GetTicks();
 901 #if 0
 902         uint64_t cpuCycles = GetCurrentV65C02Clock();
 903         uint32_t cyclesBurned = (uint32_t)(cpuCycles - lastCPUCycles);
 904         WriteLog("FrameCallback: used %i cycles\n", cyclesBurned);
 905         lastCPUCycles = cpuCycles;
 906 #endif
 907
 908 //let's wait, then signal...
 909 //works longer, but then still falls behind...
 910 #ifdef THREADED_65C02
 911         if (!pauseMode)
 912                 SDL_CondSignal(cpuCond);//OK, let the CPU go another frame...
 913 #endif
 914 }
 915
 916
 917 static void BlinkTimer(void)
 918 {
 919         flash = !flash;
 920         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 sec intervals
 921 }
 922
 923
 924 /*
 925 Next problem is this: How to have events occur and synchronize with the rest
 926 of the threads?
 927
 928   o Have the CPU thread manage the timer mechanism? (need to have a method of carrying
 929     remainder CPU cycles over...)
 930
 931 One way would be to use a fractional accumulator, then subtract 1 every
 932 time it overflows. Like so:
 933
 934 double overflow = 0;
 935 uint32_t time = 20;
 936 while (!done)
 937 {
 938         Execute6808(&soundCPU, time);
 939         overflow += 0.289115646;
 940         if (overflow > 1.0)
 941         {
 942                 overflow -= 1.0;
 943                 time = 21;
 944         }
 945         else
 946                 time = 20;
 947 }
 948 */