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 // This is never set to true anywhere...
 144 //              if (cpuSleep)
 145 //                      SDL_CondWait(cpuCond, cpuMutex);
 146
 147 // decrement mainSem...
 148 #ifdef THREAD_DEBUGGING
 149 WriteLog("CPU: SDL_SemWait(mainSem);\n");
 150 #endif
 151                 SDL_SemWait(mainSem);
 152
 153 // There are exactly 800 slices of 21.333 cycles per frame, so it works out
 154 // evenly.
 155 #ifdef THREAD_DEBUGGING
 156 WriteLog("CPU: Execute65C02(&mainCPU, cycles);\n");
 157 #endif
 158                 for(int i=0; i<800; i++)
 159                 {
 160                         uint32_t cycles = 21;
 161                         overflow += 0.333333334;
 162
 163                         if (overflow > 1.0)
 164                         {
 165                                 cycles++;
 166                                 overflow -= 1.0;
 167                         }
 168
 169                         Execute65C02(&mainCPU, cycles);
 170                         WriteSampleToBuffer();
 171
 172                         // Dunno if this is correct (seems to be close enough)...
 173                         vbl = (i < 670 ? true : false);
 174                 }
 175
 176 #ifdef THREAD_DEBUGGING
 177 WriteLog("CPU: SDL_mutexP(cpuMutex);\n");
 178 #endif
 179                 SDL_mutexP(cpuMutex);
 180 // increment mainSem...
 181 #ifdef THREAD_DEBUGGING
 182 WriteLog("CPU: SDL_SemPost(mainSem);\n");
 183 #endif
 184                 SDL_SemPost(mainSem);
 185 #ifdef THREAD_DEBUGGING
 186 WriteLog("CPU: SDL_CondWait(cpuCond, cpuMutex);\n");
 187 #endif
 188                 SDL_CondWait(cpuCond, cpuMutex);
 189
 190 #ifdef THREAD_DEBUGGING
 191 WriteLog("CPU: SDL_mutexV(cpuMutex);\n");
 192 #endif
 193                 SDL_mutexV(cpuMutex);
 194         }
 195         while (!cpuFinished);
 196
 197         SDL_DestroyMutex(cpuMutex);
 198
 199         return 0;
 200 }
 201 #endif
 202
 203
 204 #if 1
 205 //
 206 // Request a change in the power state of the emulated Apple
 207 //
 208 void SetPowerState(void)
 209 {
 210 //      powerOnState = state;
 211 //      pauseMode = !state;
 212
 213 //      if (!pauseMode)
 214 //      {
 215 //printf("Turning on...\n");
 216                 // Transitioning from OFF to ON
 217 //              mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 218 //              SoundResume();
 219 //      }
 220 //      else
 221 //      {
 222 //printf("Turning off...\n");
 223                 // Turn it off...
 224 //              SoundPause();
 225 //      }
 226         powerStateChangeRequested = true;
 227 }
 228 #endif
 229
 230
 231 //
 232 // Load a file into RAM/ROM image space
 233 //
 234 bool LoadImg(char * filename, uint8_t * ram, int size)
 235 {
 236         FILE * fp = fopen(filename, "rb");
 237
 238         if (fp == NULL)
 239                 return false;
 240
 241         fread(ram, 1, size, fp);
 242         fclose(fp);
 243
 244         return true;
 245 }
 246
 247
 248 const uint8_t stateHeader[19] = "APPLE2SAVESTATE1.0";
 249 static void SaveApple2State(const char * filename)
 250 {
 251         WriteLog("Main: Saving Apple2 state...\n");
 252         FILE * file = fopen(filename, "wb");
 253
 254         if (!file)
 255         {
 256                 WriteLog("Could not open file \"%s\" for writing!\n", filename);
 257                 return;
 258         }
 259
 260         // Write out header
 261         fwrite(stateHeader, 1, 18, file);
 262
 263         // Write out CPU state
 264         fwrite(&mainCPU, 1, sizeof(mainCPU), file);
 265
 266         // Write out main memory
 267         fwrite(ram, 1, 0x10000, file);
 268         fwrite(ram2, 1, 0x10000, file);
 269
 270         // Write out state variables
 271         fputc((uint8_t)keyDown, file);
 272         fputc((uint8_t)openAppleDown, file);
 273         fputc((uint8_t)closedAppleDown, file);
 274         fputc((uint8_t)store80Mode, file);
 275         fputc((uint8_t)vbl, file);
 276         fputc((uint8_t)slotCXROM, file);
 277         fputc((uint8_t)slotC3ROM, file);
 278         fputc((uint8_t)ramrd, file);
 279         fputc((uint8_t)ramwrt, file);
 280         fputc((uint8_t)altzp, file);
 281         fputc((uint8_t)ioudis, file);
 282         fputc((uint8_t)dhires, file);
 283         fputc((uint8_t)flash, file);
 284         fputc((uint8_t)textMode, file);
 285         fputc((uint8_t)mixedMode, file);
 286         fputc((uint8_t)displayPage2, file);
 287         fputc((uint8_t)hiRes, file);
 288         fputc((uint8_t)alternateCharset, file);
 289         fputc((uint8_t)col80Mode, file);
 290         fputc(lcState, file);
 291
 292         // Write out floppy state
 293         floppyDrive.SaveState(file);
 294         fclose(file);
 295 }
 296
 297
 298 static bool LoadApple2State(const char * filename)
 299 {
 300         WriteLog("Main: Loading Apple2 state...\n");
 301         FILE * file = fopen(filename, "rb");
 302
 303         if (!file)
 304         {
 305                 WriteLog("Could not open file \"%s\" for reading!\n", filename);
 306                 return false;
 307         }
 308
 309         uint8_t buffer[18];
 310         fread(buffer, 1, 18, file);
 311
 312         // Sanity check...
 313         if (memcmp(buffer, stateHeader, 18) != 0)
 314         {
 315                 fclose(file);
 316                 WriteLog("File \"%s\" is not a valid Apple2 save state file!\n", filename);
 317                 return false;
 318         }
 319
 320         // Read CPU state
 321         fread(&mainCPU, 1, sizeof(mainCPU), file);
 322
 323         // Read main memory
 324         fread(ram, 1, 0x10000, file);
 325         fread(ram2, 1, 0x10000, file);
 326
 327         // Read in state variables
 328         keyDown = (bool)fgetc(file);
 329         openAppleDown = (bool)fgetc(file);
 330         closedAppleDown = (bool)fgetc(file);
 331         store80Mode = (bool)fgetc(file);
 332         vbl = (bool)fgetc(file);
 333         slotCXROM = (bool)fgetc(file);
 334         slotC3ROM = (bool)fgetc(file);
 335         ramrd = (bool)fgetc(file);
 336         ramwrt = (bool)fgetc(file);
 337         altzp = (bool)fgetc(file);
 338         ioudis = (bool)fgetc(file);
 339         dhires = (bool)fgetc(file);
 340         flash = (bool)fgetc(file);
 341         textMode = (bool)fgetc(file);
 342         mixedMode = (bool)fgetc(file);
 343         displayPage2 = (bool)fgetc(file);
 344         hiRes = (bool)fgetc(file);
 345         alternateCharset = (bool)fgetc(file);
 346         col80Mode = (bool)fgetc(file);
 347         lcState = fgetc(file);
 348
 349         // Read in floppy state
 350         floppyDrive.LoadState(file);
 351
 352         fclose(file);
 353
 354         // Make sure things are in a sane state before execution :-P
 355         mainCPU.RdMem = AppleReadMem;
 356         mainCPU.WrMem = AppleWriteMem;
 357         ResetMMUPointers();
 358
 359         return true;
 360 }
 361
 362
 363 static void ResetApple2State(void)
 364 {
 365         keyDown = false;
 366         openAppleDown = false;
 367         closedAppleDown = false;
 368         store80Mode = false;
 369         vbl = false;
 370         slotCXROM = false;
 371         slotC3ROM = false;
 372         ramrd = false;
 373         ramwrt = false;
 374         altzp = false;
 375         ioudis = true;
 376         dhires = false;
 377         lcState = 0x02;
 378 //      SwitchLC();                     // Make sure MMU is in sane state
 379 //NOPE, does nothing    SetupAddressMap();
 380         ResetMMUPointers();
 381
 382         // Without this, you can wedge the system :-/
 383         memset(ram, 0, 0x10000);
 384 //      memset(ram2, 0, 0x10000);
 385         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 386 }
 387
 388
 389 #ifdef CPU_CLOCK_CHECKING
 390 uint8_t counter = 0;
 391 uint32_t totalCPU = 0;
 392 uint64_t lastClock = 0;
 393 #endif
 394 //
 395 // Main loop
 396 //
 397 int main(int /*argc*/, char * /*argv*/[])
 398 {
 399         InitLog("./apple2.log");
 400         LoadSettings();
 401         srand(time(NULL));                                                                      // Initialize RNG
 402
 403         // Zero out memory
 404         memset(ram, 0, 0x10000);
 405         memset(rom, 0, 0x10000);
 406         memset(ram2, 0, 0x10000);
 407
 408         // Set up MMU
 409         SetupAddressMap();
 410         ResetMMUPointers();
 411
 412         // Set up V65C02 execution context
 413         memset(&mainCPU, 0, sizeof(V65C02REGS));
 414         mainCPU.RdMem = AppleReadMem;
 415         mainCPU.WrMem = AppleWriteMem;
 416         mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 417
 418 //      alternateCharset = true;
 419 //      if (!LoadImg(settings.BIOSPath, rom + 0xD000, 0x3000))
 420         if (!LoadImg(settings.BIOSPath, rom + 0xC000, 0x4000))
 421         {
 422                 WriteLog("Could not open file '%s'!\n", settings.BIOSPath);
 423                 return -1;
 424         }
 425
 426 //Load up disk image from config file (for now)...
 427         floppyDrive.LoadImage(settings.diskImagePath1, 0);
 428         floppyDrive.LoadImage(settings.diskImagePath2, 1);
 429
 430         WriteLog("About to initialize video...\n");
 431
 432         if (!InitVideo())
 433         {
 434                 std::cout << "Aborting!" << std::endl;
 435                 return -1;
 436         }
 437
 438         GUI::Init(sdlRenderer);
 439
 440         // Have to do this *after* video init but *before* sound init...!
 441 //Shouldn't be necessary since we're not doing emulation in the ISR...
 442         if (settings.autoStateSaving)
 443         {
 444                 // Load last state from file...
 445                 if (!LoadApple2State(settings.autoStatePath))
 446                         WriteLog("Unable to use Apple2 state file \"%s\"!\n", settings.autoStatePath);
 447         }
 448
 449         WriteLog("About to initialize audio...\n");
 450         SoundInit();
 451         SetupBlurTable();                                                       // Set up the color TV emulation blur table
 452         running = true;                                                         // Set running status...
 453         InitializeEventList();                                          // Clear the event list before we use it...
 454         SetCallbackTime(FrameCallback, 16666.66666667); // Set frame to fire at 1/60 s interval
 455         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 s intervals
 456         startTicks = SDL_GetTicks();
 457
 458 #ifdef THREADED_65C02
 459         cpuCond = SDL_CreateCond();
 460         mainSem = SDL_CreateSemaphore(1);
 461         cpuThread = SDL_CreateThread(CPUThreadFunc, NULL, NULL);
 462 //Hmm... CPU does POST (+1), wait, then WAIT (-1)
 463 //      SDL_sem * mainMutex = SDL_CreateMutex();
 464 #endif
 465
 466         WriteLog("Entering main loop...\n");
 467
 468         while (running)
 469         {
 470                 double timeToNextEvent = GetTimeToNextEvent();
 471 #ifndef THREADED_65C02
 472                 Execute65C02(&mainCPU, USEC_TO_M6502_CYCLES(timeToNextEvent));
 473 #endif
 474
 475 #ifdef CPU_CLOCK_CHECKING
 476 #ifndef THREADED_65C02
 477 totalCPU += USEC_TO_M6502_CYCLES(timeToNextEvent);
 478 #endif
 479 #endif
 480                 HandleNextEvent();
 481         }
 482
 483 #ifdef THREADED_65C02
 484 WriteLog("Main: cpuFinished = true;\n");
 485 cpuFinished = true;
 486 //#warning "If sound thread is behind, CPU thread will never wake up... !!! FIX !!!" [DONE]
 487 //What to do? How do you know when the CPU is sleeping???
 488 //USE A CONDITIONAL!!! OF COURSE!!!!!!11!11!11!!!1!
 489 //Nope, use a semaphore...
 490 WriteLog("Main: SDL_SemWait(mainSem);\n");
 491         // Only do this if NOT in power off/emulation paused mode!
 492         if (!pauseMode)
 493                 // Should lock until CPU thread is waiting...
 494                 SDL_SemWait(mainSem);
 495 #endif
 496
 497 WriteLog("Main: SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up\n");
 498         SDL_CondSignal(cpuCond);//thread is probably asleep, wake it up
 499 WriteLog("Main: SDL_WaitThread(cpuThread, NULL);\n");
 500         SDL_WaitThread(cpuThread, NULL);
 501 //nowok:SDL_WaitThread(CPUThreadFunc, NULL);
 502 WriteLog("Main: SDL_DestroyCond(cpuCond);\n");
 503         SDL_DestroyCond(cpuCond);
 504         SDL_DestroySemaphore(mainSem);
 505
 506         if (settings.autoStateSaving)
 507         {
 508                 // Save state here...
 509                 SaveApple2State(settings.autoStatePath);
 510         }
 511
 512         floppyDrive.SaveImage(0);
 513         floppyDrive.SaveImage(1);
 514
 515         SoundDone();
 516         VideoDone();
 517         SaveSettings();
 518         LogDone();
 519
 520         return 0;
 521 }
 522
 523
 524 /*
 525 Apple II keycodes
 526 -----------------
 527
 528 Key     Aln CTL SHF BTH
 529 -----------------------
 530 space   $A0     $A0     $A0 $A0         No xlation
 531 RETURN  $8D     $8D     $8D     $8D             No xlation
 532 0               $B0     $B0     $B0     $B0             Need to screen shift+0 (?)
 533 1!              $B1 $B1 $A1 $A1         No xlation
 534 2"              $B2     $B2     $A2     $A2             No xlation
 535 3#              $B3     $B3     $A3     $A3             No xlation
 536 4$              $B4     $B4     $A4     $A4             No xlation
 537 5%              $B5     $B5     $A5     $A5             No xlation
 538 6&              $B6     $B6     $A6     $A6             No xlation
 539 7'              $B7     $B7     $A7     $A7             No xlation
 540 8(              $B8     $B8     $A8     $A8             No xlation
 541 9)              $B9     $B9     $A9     $A9             No xlation
 542 :*              $BA     $BA     $AA     $AA             No xlation
 543 ;+              $BB     $BB     $AB     $AB             No xlation
 544 ,<              $AC     $AC     $BC     $BC             No xlation
 545 -=              $AD     $AD     $BD     $BD             No xlation
 546 .>              $AE     $AE     $BE     $BE             No xlation
 547 /?              $AF     $AF     $BF     $BF             No xlation
 548 A               $C1     $81     $C1     $81
 549 B               $C2     $82     $C2     $82
 550 C               $C3     $83     $C3     $83
 551 D               $C4     $84     $C4     $84
 552 E               $C5     $85     $C5     $85
 553 F               $C6     $86     $C6     $86
 554 G               $C7     $87     $C7     $87
 555 H               $C8     $88     $C8     $88
 556 I               $C9     $89     $C9     $89
 557 J               $CA     $8A     $CA     $8A
 558 K               $CB     $8B     $CB     $8B
 559 L               $CC     $8C     $CC     $8C
 560 M               $CD     $8D     $DD     $9D             -> ODD
 561 N^              $CE     $8E     $DE     $9E             -> ODD
 562 O               $CF     $8F     $CF     $8F
 563 P@              $D0     $90     $C0     $80             Need to xlate CTL+SHFT+P & SHFT+P (?)
 564 Q               $D1     $91     $D1     $91
 565 R               $D2     $92     $D2     $92
 566 S               $D3     $93     $D3     $93
 567 T               $D4     $94     $D4     $94
 568 U               $D5     $95     $D5     $95
 569 V               $D6     $96     $D6     $96
 570 W               $D7     $97     $D7     $97
 571 X               $D8     $98     $D8     $98
 572 Y               $D9     $99     $D9     $99
 573 Z               $DA     $9A     $DA     $9A
 574 <-              $88     $88     $88     $88
 575 ->              $95     $95     $95     $95
 576 ESC             $9B     $9B     $9B     $9B             No xlation
 577
 578 */
 579 //static uint64_t lastCPUCycles = 0;
 580 static uint32_t frameCount = 0;
 581 static void FrameCallback(void)
 582 {
 583         SDL_Event event;
 584
 585         while (SDL_PollEvent(&event))
 586         {
 587                 switch (event.type)
 588                 {
 589 // Problem with using SDL_TEXTINPUT is that it causes key delay. :-/
 590 #if 0
 591                 case SDL_TEXTINPUT:
 592 //Need to do some key translation here, and screen out non-apple keys as well...
 593 //(really, could do it all in SDL_KEYDOWN, would just have to get symbols &
 594 // everything else done separately. this is slightly easier. :-P)
 595 //                      if (event.key.keysym.sym == SDLK_TAB)   // Prelim key screening...
 596                         if (event.edit.text[0] == '\t') // Prelim key screening...
 597                                 break;
 598
 599                         lastKeyPressed = event.edit.text[0];
 600                         keyDown = true;
 601
 602                         //kludge: should have a caps lock thingy here...
 603                         //or all uppercase for ][+...
 604 //                      if (lastKeyPressed >= 'a' && lastKeyPressed <='z')
 605 //                              lastKeyPressed &= 0xDF;         // Convert to upper case...
 606
 607                         break;
 608 #endif
 609                 case SDL_KEYDOWN:
 610                         // Use ALT+Q to exit, as well as the usual window decoration method
 611                         if (event.key.keysym.sym == SDLK_q && (event.key.keysym.mod & KMOD_ALT))
 612                                 running = false;
 613
 614                         // CTRL+RESET key emulation (mapped to CTRL+`)
 615 // This doesn't work...
 616 //                      if (event.key.keysym.sym == SDLK_BREAK && (event.key.keysym.mod & KMOD_CTRL))
 617 //                      if (event.key.keysym.sym == SDLK_PAUSE && (event.key.keysym.mod & KMOD_CTRL))
 618                         if (event.key.keysym.sym == SDLK_BACKQUOTE && (event.key.keysym.mod & KMOD_CTRL))
 619                         {
 620 //NOTE that this shouldn't take place until the key is lifted... !!! FIX !!!
 621 //ALSO it seems to leave the machine in an inconsistent state vis-a-vis the language card...
 622                                 mainCPU.cpuFlags |= V65C02_ASSERT_LINE_RESET;
 623                                 break;
 624                         }
 625
 626                         if (event.key.keysym.sym == SDLK_RIGHT)
 627                                 lastKeyPressed = 0x15, keyDown = true;
 628                         else if (event.key.keysym.sym == SDLK_LEFT)
 629                                 lastKeyPressed = 0x08, keyDown = true;
 630                         else if (event.key.keysym.sym == SDLK_UP)
 631                                 lastKeyPressed = 0x0B, keyDown = true;
 632                         else if (event.key.keysym.sym == SDLK_DOWN)
 633                                 lastKeyPressed = 0x0A, keyDown = true;
 634                         else if (event.key.keysym.sym == SDLK_RETURN)
 635                                 lastKeyPressed = 0x0D, keyDown = true;
 636                         else if (event.key.keysym.sym == SDLK_ESCAPE)
 637                                 lastKeyPressed = 0x1B, keyDown = true;
 638                         else if (event.key.keysym.sym == SDLK_BACKSPACE)
 639                                 lastKeyPressed = 0x7F, keyDown = true;
 640
 641                         // Fix CTRL+key combo...
 642                         if (event.key.keysym.mod & KMOD_CTRL)
 643                         {
 644                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 645                                 {
 646                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 1;
 647                                         keyDown = true;
 648 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
 649                                         break;
 650                                 }
 651                         }
 652
 653 #if 1
 654                         // Fix SHIFT+key combo...
 655                         if (event.key.keysym.mod & KMOD_SHIFT)
 656                         {
 657                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 658                                 {
 659                                         lastKeyPressed = (event.key.keysym.sym - SDLK_a) + 0x41;
 660                                         keyDown = true;
 661 //printf("Key combo pressed: CTRL+%c\n", lastKeyPressed + 0x40);
 662                                         break;
 663                                 }
 664                                 else if (event.key.keysym.sym == SDLK_1)
 665                                 {
 666                                         lastKeyPressed = '!';
 667                                         keyDown = true;
 668                                         break;
 669                                 }
 670                                 else if (event.key.keysym.sym == SDLK_2)
 671                                 {
 672                                         lastKeyPressed = '@';
 673                                         keyDown = true;
 674                                         break;
 675                                 }
 676                                 else if (event.key.keysym.sym == SDLK_3)
 677                                 {
 678                                         lastKeyPressed = '#';
 679                                         keyDown = true;
 680                                         break;
 681                                 }
 682                                 else if (event.key.keysym.sym == SDLK_4)
 683                                 {
 684                                         lastKeyPressed = '$';
 685                                         keyDown = true;
 686                                         break;
 687                                 }
 688                                 else if (event.key.keysym.sym == SDLK_5)
 689                                 {
 690                                         lastKeyPressed = '%';
 691                                         keyDown = true;
 692                                         break;
 693                                 }
 694                                 else if (event.key.keysym.sym == SDLK_6)
 695                                 {
 696                                         lastKeyPressed = '^';
 697                                         keyDown = true;
 698                                         break;
 699                                 }
 700                                 else if (event.key.keysym.sym == SDLK_7)
 701                                 {
 702                                         lastKeyPressed = '&';
 703                                         keyDown = true;
 704                                         break;
 705                                 }
 706                                 else if (event.key.keysym.sym == SDLK_8)
 707                                 {
 708                                         lastKeyPressed = '*';
 709                                         keyDown = true;
 710                                         break;
 711                                 }
 712                                 else if (event.key.keysym.sym == SDLK_9)
 713                                 {
 714                                         lastKeyPressed = '(';
 715                                         keyDown = true;
 716                                         break;
 717                                 }
 718                                 else if (event.key.keysym.sym == SDLK_0)
 719                                 {
 720                                         lastKeyPressed = ')';
 721                                         keyDown = true;
 722                                         break;
 723                                 }
 724                                 else if (event.key.keysym.sym == SDLK_MINUS)
 725                                 {
 726                                         lastKeyPressed = '_';
 727                                         keyDown = true;
 728                                         break;
 729                                 }
 730                                 else if (event.key.keysym.sym == SDLK_EQUALS)
 731                                 {
 732                                         lastKeyPressed = '+';
 733                                         keyDown = true;
 734                                         break;
 735                                 }
 736                                 else if (event.key.keysym.sym == SDLK_LEFTBRACKET)
 737                                 {
 738                                         lastKeyPressed = '{';
 739                                         keyDown = true;
 740                                         break;
 741                                 }
 742                                 else if (event.key.keysym.sym == SDLK_RIGHTBRACKET)
 743                                 {
 744                                         lastKeyPressed = '}';
 745                                         keyDown = true;
 746                                         break;
 747                                 }
 748                                 else if (event.key.keysym.sym == SDLK_BACKSLASH)
 749                                 {
 750                                         lastKeyPressed = '|';
 751                                         keyDown = true;
 752                                         break;
 753                                 }
 754                                 else if (event.key.keysym.sym == SDLK_SEMICOLON)
 755                                 {
 756                                         lastKeyPressed = ':';
 757                                         keyDown = true;
 758                                         break;
 759                                 }
 760                                 else if (event.key.keysym.sym == SDLK_QUOTE)
 761                                 {
 762                                         lastKeyPressed = '"';
 763                                         keyDown = true;
 764                                         break;
 765                                 }
 766                                 else if (event.key.keysym.sym == SDLK_COMMA)
 767                                 {
 768                                         lastKeyPressed = '<';
 769                                         keyDown = true;
 770                                         break;
 771                                 }
 772                                 else if (event.key.keysym.sym == SDLK_PERIOD)
 773                                 {
 774                                         lastKeyPressed = '>';
 775                                         keyDown = true;
 776                                         break;
 777                                 }
 778                                 else if (event.key.keysym.sym == SDLK_SLASH)
 779                                 {
 780                                         lastKeyPressed = '?';
 781                                         keyDown = true;
 782                                         break;
 783                                 }
 784                                 else if (event.key.keysym.sym == SDLK_BACKQUOTE)
 785                                 {
 786                                         lastKeyPressed = '~';
 787                                         keyDown = true;
 788                                         break;
 789                                 }
 790                         }
 791 #endif
 792
 793                         // General keys...
 794                         if (event.key.keysym.sym >= SDLK_SPACE && event.key.keysym.sym <= SDLK_z)
 795                         {
 796                                 lastKeyPressed = event.key.keysym.sym;
 797                                 keyDown = true;
 798
 799                                 // Check for Caps Lock key...
 800                                 if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z && capsLock)
 801                                         lastKeyPressed -= 0x20;
 802
 803                                 break;
 804                         }
 805
 806                         if (event.key.keysym.sym == SDLK_PAUSE)
 807                         {
 808                                 pauseMode = !pauseMode;
 809
 810                                 if (pauseMode)
 811                                 {
 812                                         SoundPause();
 813                                         SpawnMessage("*** PAUSED ***");
 814                                 }
 815                                 else
 816                                 {
 817                                         SoundResume();
 818                                         SpawnMessage("*** RESUME ***");
 819                                 }
 820                         }
 821
 822                         // Paddle buttons 0 & 1
 823 //                      if (event.key.keysym.sym == SDLK_INSERT)
 824                         if (event.key.keysym.sym == SDLK_LALT)
 825                                 openAppleDown = true;
 826 //                      if (event.key.keysym.sym == SDLK_PAGEUP)
 827                         if (event.key.keysym.sym == SDLK_RALT)
 828                                 closedAppleDown = true;
 829
 830                         if (event.key.keysym.sym == SDLK_F11)
 831                                 dumpDis = !dumpDis;                             // Toggle the disassembly process
 832
 833 /*else if (event.key.keysym.sym == SDLK_F9)
 834 {
 835         floppyDrive.CreateBlankImage(0);
 836 //      SpawnMessage("Image cleared...");
 837 }//*/
 838 /*else if (event.key.keysym.sym == SDLK_F10)
 839 {
 840         floppyDrive.SwapImages();
 841 //      SpawnMessage("Image swapped...");
 842 }//*/
 843
 844                         if (event.key.keysym.sym == SDLK_F2)// Toggle the palette
 845                                 TogglePalette();
 846                         else if (event.key.keysym.sym == SDLK_F3)// Cycle through screen types
 847                                 CycleScreenTypes();
 848                         else if (event.key.keysym.sym == SDLK_F5)
 849                         {
 850                                 VolumeDown();
 851                                 char volStr[19] = "[****************]";
 852 //                              volStr[GetVolume()] = 0;
 853                                 for(int i=GetVolume(); i<16; i++)
 854                                         volStr[1 + i] = '-';
 855                                 SpawnMessage("Volume: %s", volStr);
 856                         }
 857                         else if (event.key.keysym.sym == SDLK_F6)
 858                         {
 859                                 VolumeUp();
 860                                 char volStr[19] = "[****************]";
 861 //                              volStr[GetVolume()] = 0;
 862                                 for(int i=GetVolume(); i<16; i++)
 863                                         volStr[1 + i] = '-';
 864                                 SpawnMessage("Volume: %s", volStr);
 865                         }
 866                         else if (event.key.keysym.sym == SDLK_F12)
 867                         {
 868                                 if (!fullscreenDebounce)
 869                                 {
 870                                         ToggleFullScreen();
 871                                         fullscreenDebounce = true;
 872                                 }
 873                         }
 874
 875                         if (event.key.keysym.sym == SDLK_CAPSLOCK)
 876                         {
 877                                 if (!capsLockDebounce)
 878                                 {
 879                                         capsLock = !capsLock;
 880                                         capsLockDebounce = true;
 881                                 }
 882                         }
 883
 884                         break;
 885                 case SDL_KEYUP:
 886                         if (event.key.keysym.sym == SDLK_F12)
 887                                 fullscreenDebounce = false;
 888                         if (event.key.keysym.sym == SDLK_CAPSLOCK)
 889                                 capsLockDebounce = false;
 890
 891                         // Paddle buttons 0 & 1
 892 //                      if (event.key.keysym.sym == SDLK_INSERT)
 893                         if (event.key.keysym.sym == SDLK_LALT)
 894                                 openAppleDown = false;
 895 //                      if (event.key.keysym.sym == SDLK_PAGEUP)
 896                         if (event.key.keysym.sym == SDLK_RALT)
 897                                 closedAppleDown = false;
 898
 899 //                      if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z)
 900 //                              keyDown = false;
 901
 902                         break;
 903                 case SDL_MOUSEBUTTONDOWN:
 904                         GUI::MouseDown(event.motion.x, event.motion.y, event.motion.state);
 905                         break;
 906                 case SDL_MOUSEBUTTONUP:
 907                         GUI::MouseUp(event.motion.x, event.motion.y, event.motion.state);
 908                         break;
 909                 case SDL_MOUSEMOTION:
 910                         GUI::MouseMove(event.motion.x, event.motion.y, event.motion.state);
 911                         break;
 912                 case SDL_WINDOWEVENT:
 913                         if (event.window.event == SDL_WINDOWEVENT_LEAVE)
 914                                 GUI::MouseMove(0, 0, 0);
 915
 916                         break;
 917                 case SDL_QUIT:
 918                         running = false;
 919                 }
 920         }
 921
 922         // Handle power request from the GUI
 923         if (powerStateChangeRequested)
 924         {
 925                 if (GUI::powerOnState)
 926                 {
 927                         pauseMode = false;
 928 //                      SoundResume();
 929                         // Unlock the CPU thread...
 930                         SDL_SemPost(mainSem);
 931                 }
 932                 else
 933                 {
 934                         pauseMode = true;
 935                         // Should lock until CPU thread is waiting...
 936                         SDL_SemWait(mainSem);
 937 //                      SoundPause();
 938                         ResetApple2State();
 939                 }
 940
 941                 powerStateChangeRequested = false;
 942         }
 943
 944 //#warning "!!! Taking MAJOR time hit with the video frame rendering !!!"
 945 //      if (!pauseMode)
 946         {
 947                 RenderVideoFrame();
 948         }
 949
 950         RenderScreenBuffer();
 951         GUI::Render(sdlRenderer);
 952         SDL_RenderPresent(sdlRenderer);
 953         SetCallbackTime(FrameCallback, 16666.66666667);
 954
 955 #ifdef CPU_CLOCK_CHECKING
 956 //We know it's stopped, so we can get away with this...
 957 counter++;
 958 if (counter == 60)
 959 {
 960         uint64_t clock = GetCurrentV65C02Clock();
 961 //totalCPU += (uint32_t)(clock - lastClock);
 962
 963         printf("Executed %u cycles...\n", (uint32_t)(clock - lastClock));
 964         lastClock = clock;
 965 //      totalCPU = 0;
 966         counter = 0;
 967 }
 968 #endif
 969
 970 // This is the problem: If you set the interval to 16, it runs faster than
 971 // 1/60s per frame. If you set it to 17, it runs slower. What we need is to
 972 // have it do 16 for one frame, then 17 for two others. Then it should average
 973 // out to 1/60s per frame every 3 frames.
 974         frameCount = (frameCount + 1) % 3;
 975         uint32_t waitFrameTime = 17 - (frameCount == 0 ? 1 : 0);
 976
 977         // Wait for next frame...
 978         while (SDL_GetTicks() - startTicks < waitFrameTime)
 979                 SDL_Delay(1);
 980
 981         startTicks = SDL_GetTicks();
 982 #if 0
 983         uint64_t cpuCycles = GetCurrentV65C02Clock();
 984         uint32_t cyclesBurned = (uint32_t)(cpuCycles - lastCPUCycles);
 985         WriteLog("FrameCallback: used %i cycles\n", cyclesBurned);
 986         lastCPUCycles = cpuCycles
 987 #endif
 988
 989 //let's wait, then signal...
 990 //works longer, but then still falls behind...
 991 #ifdef THREADED_65C02
 992         if (!pauseMode)
 993                 SDL_CondSignal(cpuCond);//OK, let the CPU go another frame...
 994 #endif
 995 }
 996
 997
 998 static void BlinkTimer(void)
 999 {
1000         flash = !flash;
1001         SetCallbackTime(BlinkTimer, 250000);            // Set up blinking at 1/4 sec intervals
1002 }
1003
1004
1005 /*
1006 Next problem is this: How to have events occur and synchronize with the rest
1007 of the threads?
1008
1009   o Have the CPU thread manage the timer mechanism? (need to have a method of carrying
1010     remainder CPU cycles over...)
1011
1012 One way would be to use a fractional accumulator, then subtract 1 every
1013 time it overflows. Like so:
1014
1015 double overflow = 0;
1016 uint32_t time = 20;
1017 while (!done)
1018 {
1019         Execute6808(&soundCPU, time);
1020         overflow += 0.289115646;
1021         if (overflow > 1.0)
1022         {
1023                 overflow -= 1.0;
1024                 time = 21;
1025         }
1026         else
1027                 time = 20;
1028 }
1029 */