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GameBoyCore.js
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"use strict";
/*
JavaScript GameBoy Color Emulator
Copyright (C) 2010-2016 Grant Galitz
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
function GameBoyCore(canvas, ROMImage) {
//Params, etc...
this.canvas = canvas; //Canvas DOM object for drawing out the graphics to.
this.drawContext = null; // LCD Context
this.ROMImage = ROMImage; //The game's ROM.
//CPU Registers and Flags:
this.registerA = 0x01; //Register A (Accumulator)
this.FZero = true; //Register F - Result was zero
this.FSubtract = false; //Register F - Subtraction was executed
this.FHalfCarry = true; //Register F - Half carry or half borrow
this.FCarry = true; //Register F - Carry or borrow
this.registerB = 0x00; //Register B
this.registerC = 0x13; //Register C
this.registerD = 0x00; //Register D
this.registerE = 0xD8; //Register E
this.registersHL = 0x014D; //Registers H and L combined
this.stackPointer = 0xFFFE; //Stack Pointer
this.programCounter = 0x0100; //Program Counter
//Some CPU Emulation State Variables:
this.CPUCyclesTotal = 0; //Relative CPU clocking to speed set, rounded appropriately.
this.CPUCyclesTotalBase = 0; //Relative CPU clocking to speed set base.
this.CPUCyclesTotalCurrent = 0; //Relative CPU clocking to speed set, the directly used value.
this.CPUCyclesTotalRoundoff = 0; //Clocking per iteration rounding catch.
this.baseCPUCyclesPerIteration = 0; //CPU clocks per iteration at 1x speed.
this.remainingClocks = 0; //HALT clocking overrun carry over.
this.inBootstrap = true; //Whether we're in the GBC boot ROM.
this.usedBootROM = false; //Updated upon ROM loading...
this.usedGBCBootROM = false; //Did we boot to the GBC boot ROM?
this.halt = false; //Has the CPU been suspended until the next interrupt?
this.skipPCIncrement = false; //Did we trip the DMG Halt bug?
this.stopEmulator = 3; //Has the emulation been paused or a frame has ended?
this.IME = true; //Are interrupts enabled?
this.IRQLineMatched = 0; //CPU IRQ assertion.
this.interruptsRequested = 0; //IF Register
this.interruptsEnabled = 0; //IE Register
this.hdmaRunning = false; //HDMA Transfer Flag - GBC only
this.CPUTicks = 0; //The number of clock cycles emulated.
this.doubleSpeedShifter = 0; //GBC double speed clocking shifter.
this.JoyPad = 0xFF; //Joypad State (two four-bit states actually)
this.CPUStopped = false; //CPU STOP status.
//Main RAM, MBC RAM, GBC Main RAM, VRAM, etc.
this.memoryReader = []; //Array of functions mapped to read back memory
this.memoryWriter = []; //Array of functions mapped to write to memory
this.memoryHighReader = []; //Array of functions mapped to read back 0xFFXX memory
this.memoryHighWriter = []; //Array of functions mapped to write to 0xFFXX memory
this.ROM = []; //The full ROM file dumped to an array.
this.memory = []; //Main Core Memory
this.MBCRam = []; //Switchable RAM (Used by games for more RAM) for the main memory range 0xA000 - 0xC000.
this.VRAM = []; //Extra VRAM bank for GBC.
this.GBCMemory = []; //GBC main RAM Banks
this.MBC1Mode = false; //MBC1 Type (4/32, 16/8)
this.MBCRAMBanksEnabled = false; //MBC RAM Access Control.
this.currMBCRAMBank = 0; //MBC Currently Indexed RAM Bank
this.currMBCRAMBankPosition = -0xA000; //MBC Position Adder;
this.cGBC = false; //GameBoy Color detection.
this.gbcRamBank = 1; //Currently Switched GameBoy Color ram bank
this.gbcRamBankPosition = -0xD000; //GBC RAM offset from address start.
this.gbcRamBankPositionECHO = -0xF000; //GBC RAM (ECHO mirroring) offset from address start.
this.RAMBanks = [0, 1, 2, 4, 16]; //Used to map the RAM banks to maximum size the MBC used can do.
this.ROMBank1offs = 0; //Offset of the ROM bank switching.
this.currentROMBank = 0; //The parsed current ROM bank selection.
this.cartridgeType = 0; //Cartridge Type
this.name = ""; //Name of the game
this.gameCode = ""; //Game code (Suffix for older games)
this.fromSaveState = false; //A boolean to see if this was loaded in as a save state.
this.savedStateFileName = ""; //When loaded in as a save state, this will not be empty.
this.STATTracker = 0; //Tracker for STAT triggering.
this.modeSTAT = 0; //The scan line mode (for lines 1-144 it's 2-3-0, for 145-154 it's 1)
this.spriteCount = 252; //Mode 3 extra clocking counter (Depends on how many sprites are on the current line.).
this.LYCMatchTriggerSTAT = false; //Should we trigger an interrupt if LY==LYC?
this.mode2TriggerSTAT = false; //Should we trigger an interrupt if in mode 2?
this.mode1TriggerSTAT = false; //Should we trigger an interrupt if in mode 1?
this.mode0TriggerSTAT = false; //Should we trigger an interrupt if in mode 0?
this.LCDisOn = false; //Is the emulated LCD controller on?
this.LINECONTROL = []; //Array of functions to handle each scan line we do (onscreen + offscreen)
this.DISPLAYOFFCONTROL = [function (parentObj) {
//Array of line 0 function to handle the LCD controller when it's off (Do nothing!).
}];
this.LCDCONTROL = null; //Pointer to either LINECONTROL or DISPLAYOFFCONTROL.
this.initializeLCDController(); //Compile the LCD controller functions.
//RTC (Real Time Clock for MBC3):
this.RTCisLatched = false;
this.latchedSeconds = 0; //RTC latched seconds.
this.latchedMinutes = 0; //RTC latched minutes.
this.latchedHours = 0; //RTC latched hours.
this.latchedLDays = 0; //RTC latched lower 8-bits of the day counter.
this.latchedHDays = 0; //RTC latched high-bit of the day counter.
this.RTCSeconds = 0; //RTC seconds counter.
this.RTCMinutes = 0; //RTC minutes counter.
this.RTCHours = 0; //RTC hours counter.
this.RTCDays = 0; //RTC days counter.
this.RTCDayOverFlow = false; //Did the RTC overflow and wrap the day counter?
this.RTCHALT = false; //Is the RTC allowed to clock up?
//Gyro:
this.highX = 127;
this.lowX = 127;
this.highY = 127;
this.lowY = 127;
//Sound variables:
this.audioHandle = null; //XAudioJS handle
this.numSamplesTotal = 0; //Length of the sound buffers.
this.dutyLookup = [ //Map the duty values given to ones we can work with.
[false, false, false, false, false, false, false, true],
[true, false, false, false, false, false, false, true],
[true, false, false, false, false, true, true, true],
[false, true, true, true, true, true, true, false]
];
this.bufferContainAmount = 0; //Buffer maintenance metric.
this.LSFR15Table = null;
this.LSFR7Table = null;
this.noiseSampleTable = null;
this.initializeAudioStartState();
this.soundMasterEnabled = false; //As its name implies
this.channel3PCM = null; //Channel 3 adjusted sample buffer.
//Vin Shit:
this.VinLeftChannelMasterVolume = 8; //Computed post-mixing volume.
this.VinRightChannelMasterVolume = 8; //Computed post-mixing volume.
//Channel paths enabled:
this.leftChannel1 = false;
this.leftChannel2 = false;
this.leftChannel3 = false;
this.leftChannel4 = false;
this.rightChannel1 = false;
this.rightChannel2 = false;
this.rightChannel3 = false;
this.rightChannel4 = false;
this.audioClocksUntilNextEvent = 1;
this.audioClocksUntilNextEventCounter = 1;
//Channel output level caches:
this.channel1currentSampleLeft = 0;
this.channel1currentSampleRight = 0;
this.channel2currentSampleLeft = 0;
this.channel2currentSampleRight = 0;
this.channel3currentSampleLeft = 0;
this.channel3currentSampleRight = 0;
this.channel4currentSampleLeft = 0;
this.channel4currentSampleRight = 0;
this.channel1currentSampleLeftSecondary = 0;
this.channel1currentSampleRightSecondary = 0;
this.channel2currentSampleLeftSecondary = 0;
this.channel2currentSampleRightSecondary = 0;
this.channel3currentSampleLeftSecondary = 0;
this.channel3currentSampleRightSecondary = 0;
this.channel4currentSampleLeftSecondary = 0;
this.channel4currentSampleRightSecondary = 0;
this.channel1currentSampleLeftTrimary = 0;
this.channel1currentSampleRightTrimary = 0;
this.channel2currentSampleLeftTrimary = 0;
this.channel2currentSampleRightTrimary = 0;
this.mixerOutputCache = 0;
//Pre-multipliers to cache some calculations:
this.emulatorSpeed = 1;
this.initializeTiming();
//Audio generation counters:
this.audioTicks = 0; //Used to sample the audio system every x CPU instructions.
this.audioIndex = 0; //Used to keep alignment on audio generation.
this.downsampleInput = 0;
this.audioDestinationPosition = 0; //Used to keep alignment on audio generation.
this.rollover = 0; //Used to keep alignment on the number of samples to output (Realign from counter alias).
//Timing Variables
this.emulatorTicks = 0; //Times for how many instructions to execute before ending the loop.
this.DIVTicks = 56; //DIV Ticks Counter (Invisible lower 8-bit)
this.LCDTicks = 60; //Counter for how many instructions have been executed on a scanline so far.
this.timerTicks = 0; //Counter for the TIMA timer.
this.TIMAEnabled = false; //Is TIMA enabled?
this.TACClocker = 1024; //Timer Max Ticks
this.serialTimer = 0; //Serial IRQ Timer
this.serialShiftTimer = 0; //Serial Transfer Shift Timer
this.serialShiftTimerAllocated = 0; //Serial Transfer Shift Timer Refill
this.IRQEnableDelay = 0; //Are the interrupts on queue to be enabled?
var dateVar = new Date();
this.lastIteration = dateVar.getTime();//The last time we iterated the main loop.
dateVar = new Date();
this.firstIteration = dateVar.getTime();
this.iterations = 0;
this.actualScanLine = 0; //Actual scan line...
this.lastUnrenderedLine = 0; //Last rendered scan line...
this.queuedScanLines = 0;
this.totalLinesPassed = 0;
this.haltPostClocks = 0; //Post-Halt clocking.
//ROM Cartridge Components:
this.cMBC1 = false; //Does the cartridge use MBC1?
this.cMBC2 = false; //Does the cartridge use MBC2?
this.cMBC3 = false; //Does the cartridge use MBC3?
this.cMBC5 = false; //Does the cartridge use MBC5?
this.cMBC7 = false; //Does the cartridge use MBC7?
this.cSRAM = false; //Does the cartridge use save RAM?
this.cMMMO1 = false; //...
this.cRUMBLE = false; //Does the cartridge use the RUMBLE addressing (modified MBC5)?
this.cCamera = false; //Is the cartridge actually a GameBoy Camera?
this.cTAMA5 = false; //Does the cartridge use TAMA5? (Tamagotchi Cartridge)
this.cHuC3 = false; //Does the cartridge use HuC3 (Hudson Soft / modified MBC3)?
this.cHuC1 = false; //Does the cartridge use HuC1 (Hudson Soft / modified MBC1)?
this.cTIMER = false; //Does the cartridge have an RTC?
this.ROMBanks = [ // 1 Bank = 16 KBytes = 256 Kbits
2, 4, 8, 16, 32, 64, 128, 256, 512
];
this.ROMBanks[0x52] = 72;
this.ROMBanks[0x53] = 80;
this.ROMBanks[0x54] = 96;
this.numRAMBanks = 0; //How many RAM banks were actually allocated?
////Graphics Variables
this.currVRAMBank = 0; //Current VRAM bank for GBC.
this.backgroundX = 0; //Register SCX (X-Scroll)
this.backgroundY = 0; //Register SCY (Y-Scroll)
this.gfxWindowDisplay = false; //Is the windows enabled?
this.gfxSpriteShow = false; //Are sprites enabled?
this.gfxSpriteNormalHeight = true; //Are we doing 8x8 or 8x16 sprites?
this.bgEnabled = true; //Is the BG enabled?
this.BGPriorityEnabled = true; //Can we flag the BG for priority over sprites?
this.gfxWindowCHRBankPosition = 0; //The current bank of the character map the window uses.
this.gfxBackgroundCHRBankPosition = 0; //The current bank of the character map the BG uses.
this.gfxBackgroundBankOffset = 0x80; //Fast mapping of the tile numbering/
this.windowY = 0; //Current Y offset of the window.
this.windowX = 0; //Current X offset of the window.
this.drewBlank = 0; //To prevent the repeating of drawing a blank screen.
this.drewFrame = false; //Throttle how many draws we can do to once per iteration.
this.midScanlineOffset = -1; //mid-scanline rendering offset.
this.pixelEnd = 0; //track the x-coord limit for line rendering (mid-scanline usage).
this.currentX = 0; //The x-coord we left off at for mid-scanline rendering.
//BG Tile Pointer Caches:
this.BGCHRBank1 = null;
this.BGCHRBank2 = null;
this.BGCHRCurrentBank = null;
//Tile Data Cache:
this.tileCache = null;
//Palettes:
this.colors = [0xEFFFDE, 0xADD794, 0x529273, 0x183442]; //"Classic" GameBoy palette colors.
this.OBJPalette = null;
this.BGPalette = null;
this.gbcOBJRawPalette = null;
this.gbcBGRawPalette = null;
this.gbOBJPalette = null;
this.gbBGPalette = null;
this.gbcOBJPalette = null;
this.gbcBGPalette = null;
this.gbBGColorizedPalette = null;
this.gbOBJColorizedPalette = null;
this.cachedBGPaletteConversion = null;
this.cachedOBJPaletteConversion = null;
this.updateGBBGPalette = this.updateGBRegularBGPalette;
this.updateGBOBJPalette = this.updateGBRegularOBJPalette;
this.colorizedGBPalettes = false;
this.BGLayerRender = null; //Reference to the BG rendering function.
this.WindowLayerRender = null; //Reference to the window rendering function.
this.SpriteLayerRender = null; //Reference to the OAM rendering function.
this.frameBuffer = []; //The internal frame-buffer.
this.swizzledFrame = null; //The secondary gfx buffer that holds the converted RGBA values.
this.canvasBuffer = null; //imageData handle
this.pixelStart = 0; //Temp variable for holding the current working framebuffer offset.
//Variables used for scaling in JS:
this.onscreenWidth = this.offscreenWidth = 160;
this.onscreenHeight = this.offscreenHeight = 144;
this.offscreenRGBCount = this.onscreenWidth * this.onscreenHeight * 4;
this.resizePathClear = true;
//Initialize the white noise cache tables ahead of time:
this.intializeWhiteNoise();
}
GameBoyCore.prototype.GBBOOTROM = [ //GB BOOT ROM
//Add 256 byte boot rom here if you are going to use it.
];
GameBoyCore.prototype.GBCBOOTROM = [ //GBC BOOT ROM
//Add 2048 byte boot rom here if you are going to use it.
];
GameBoyCore.prototype.ffxxDump = [ //Dump of the post-BOOT I/O register state (From gambatte):
0x0F, 0x00, 0x7C, 0xFF, 0x00, 0x00, 0x00, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01,
0x80, 0xBF, 0xF3, 0xFF, 0xBF, 0xFF, 0x3F, 0x00, 0xFF, 0xBF, 0x7F, 0xFF, 0x9F, 0xFF, 0xBF, 0xFF,
0xFF, 0x00, 0x00, 0xBF, 0x77, 0xF3, 0xF1, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
0x91, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x7E, 0xFF, 0xFE,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC0, 0xFF, 0xC1, 0x00, 0xFE, 0xFF, 0xFF, 0xFF,
0xF8, 0xFF, 0x00, 0x00, 0x00, 0x8F, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xCE, 0xED, 0x66, 0x66, 0xCC, 0x0D, 0x00, 0x0B, 0x03, 0x73, 0x00, 0x83, 0x00, 0x0C, 0x00, 0x0D,
0x00, 0x08, 0x11, 0x1F, 0x88, 0x89, 0x00, 0x0E, 0xDC, 0xCC, 0x6E, 0xE6, 0xDD, 0xDD, 0xD9, 0x99,
0xBB, 0xBB, 0x67, 0x63, 0x6E, 0x0E, 0xEC, 0xCC, 0xDD, 0xDC, 0x99, 0x9F, 0xBB, 0xB9, 0x33, 0x3E,
0x45, 0xEC, 0x52, 0xFA, 0x08, 0xB7, 0x07, 0x5D, 0x01, 0xFD, 0xC0, 0xFF, 0x08, 0xFC, 0x00, 0xE5,
0x0B, 0xF8, 0xC2, 0xCE, 0xF4, 0xF9, 0x0F, 0x7F, 0x45, 0x6D, 0x3D, 0xFE, 0x46, 0x97, 0x33, 0x5E,
0x08, 0xEF, 0xF1, 0xFF, 0x86, 0x83, 0x24, 0x74, 0x12, 0xFC, 0x00, 0x9F, 0xB4, 0xB7, 0x06, 0xD5,
0xD0, 0x7A, 0x00, 0x9E, 0x04, 0x5F, 0x41, 0x2F, 0x1D, 0x77, 0x36, 0x75, 0x81, 0xAA, 0x70, 0x3A,
0x98, 0xD1, 0x71, 0x02, 0x4D, 0x01, 0xC1, 0xFF, 0x0D, 0x00, 0xD3, 0x05, 0xF9, 0x00, 0x0B, 0x00
];
GameBoyCore.prototype.OPCODE = [
//NOP
//#0x00:
function (parentObj) {
//Do Nothing...
},
//LD BC, nn
//#0x01:
function (parentObj) {
parentObj.registerC = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.registerB = parentObj.memoryRead((parentObj.programCounter + 1) & 0xFFFF);
parentObj.programCounter = (parentObj.programCounter + 2) & 0xFFFF;
},
//LD (BC), A
//#0x02:
function (parentObj) {
parentObj.memoryWrite((parentObj.registerB << 8) | parentObj.registerC, parentObj.registerA);
},
//INC BC
//#0x03:
function (parentObj) {
var temp_var = ((parentObj.registerB << 8) | parentObj.registerC) + 1;
parentObj.registerB = (temp_var >> 8) & 0xFF;
parentObj.registerC = temp_var & 0xFF;
},
//INC B
//#0x04:
function (parentObj) {
parentObj.registerB = (parentObj.registerB + 1) & 0xFF;
parentObj.FZero = (parentObj.registerB == 0);
parentObj.FHalfCarry = ((parentObj.registerB & 0xF) == 0);
parentObj.FSubtract = false;
},
//DEC B
//#0x05:
function (parentObj) {
parentObj.registerB = (parentObj.registerB - 1) & 0xFF;
parentObj.FZero = (parentObj.registerB == 0);
parentObj.FHalfCarry = ((parentObj.registerB & 0xF) == 0xF);
parentObj.FSubtract = true;
},
//LD B, n
//#0x06:
function (parentObj) {
parentObj.registerB = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//RLCA
//#0x07:
function (parentObj) {
parentObj.FCarry = (parentObj.registerA > 0x7F);
parentObj.registerA = ((parentObj.registerA << 1) & 0xFF) | (parentObj.registerA >> 7);
parentObj.FZero = parentObj.FSubtract = parentObj.FHalfCarry = false;
},
//LD (nn), SP
//#0x08:
function (parentObj) {
var temp_var = (parentObj.memoryRead((parentObj.programCounter + 1) & 0xFFFF) << 8) | parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 2) & 0xFFFF;
parentObj.memoryWrite(temp_var, parentObj.stackPointer & 0xFF);
parentObj.memoryWrite((temp_var + 1) & 0xFFFF, parentObj.stackPointer >> 8);
},
//ADD HL, BC
//#0x09:
function (parentObj) {
var dirtySum = parentObj.registersHL + ((parentObj.registerB << 8) | parentObj.registerC);
parentObj.FHalfCarry = ((parentObj.registersHL & 0xFFF) > (dirtySum & 0xFFF));
parentObj.FCarry = (dirtySum > 0xFFFF);
parentObj.registersHL = dirtySum & 0xFFFF;
parentObj.FSubtract = false;
},
//LD A, (BC)
//#0x0A:
function (parentObj) {
parentObj.registerA = parentObj.memoryRead((parentObj.registerB << 8) | parentObj.registerC);
},
//DEC BC
//#0x0B:
function (parentObj) {
var temp_var = (((parentObj.registerB << 8) | parentObj.registerC) - 1) & 0xFFFF;
parentObj.registerB = temp_var >> 8;
parentObj.registerC = temp_var & 0xFF;
},
//INC C
//#0x0C:
function (parentObj) {
parentObj.registerC = (parentObj.registerC + 1) & 0xFF;
parentObj.FZero = (parentObj.registerC == 0);
parentObj.FHalfCarry = ((parentObj.registerC & 0xF) == 0);
parentObj.FSubtract = false;
},
//DEC C
//#0x0D:
function (parentObj) {
parentObj.registerC = (parentObj.registerC - 1) & 0xFF;
parentObj.FZero = (parentObj.registerC == 0);
parentObj.FHalfCarry = ((parentObj.registerC & 0xF) == 0xF);
parentObj.FSubtract = true;
},
//LD C, n
//#0x0E:
function (parentObj) {
parentObj.registerC = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//RRCA
//#0x0F:
function (parentObj) {
parentObj.registerA = (parentObj.registerA >> 1) | ((parentObj.registerA & 1) << 7);
parentObj.FCarry = (parentObj.registerA > 0x7F);
parentObj.FZero = parentObj.FSubtract = parentObj.FHalfCarry = false;
},
//STOP
//#0x10:
function (parentObj) {
if (parentObj.cGBC) {
if ((parentObj.memory[0xFF4D] & 0x01) == 0x01) { //Speed change requested.
if (parentObj.memory[0xFF4D] > 0x7F) { //Go back to single speed mode.
cout("Going into single clock speed mode.", 0);
parentObj.doubleSpeedShifter = 0;
parentObj.memory[0xFF4D] &= 0x7F; //Clear the double speed mode flag.
}
else { //Go to double speed mode.
cout("Going into double clock speed mode.", 0);
parentObj.doubleSpeedShifter = 1;
parentObj.memory[0xFF4D] |= 0x80; //Set the double speed mode flag.
}
parentObj.memory[0xFF4D] &= 0xFE; //Reset the request bit.
}
else {
parentObj.handleSTOP();
}
}
else {
parentObj.handleSTOP();
}
},
//LD DE, nn
//#0x11:
function (parentObj) {
parentObj.registerE = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.registerD = parentObj.memoryRead((parentObj.programCounter + 1) & 0xFFFF);
parentObj.programCounter = (parentObj.programCounter + 2) & 0xFFFF;
},
//LD (DE), A
//#0x12:
function (parentObj) {
parentObj.memoryWrite((parentObj.registerD << 8) | parentObj.registerE, parentObj.registerA);
},
//INC DE
//#0x13:
function (parentObj) {
var temp_var = ((parentObj.registerD << 8) | parentObj.registerE) + 1;
parentObj.registerD = (temp_var >> 8) & 0xFF;
parentObj.registerE = temp_var & 0xFF;
},
//INC D
//#0x14:
function (parentObj) {
parentObj.registerD = (parentObj.registerD + 1) & 0xFF;
parentObj.FZero = (parentObj.registerD == 0);
parentObj.FHalfCarry = ((parentObj.registerD & 0xF) == 0);
parentObj.FSubtract = false;
},
//DEC D
//#0x15:
function (parentObj) {
parentObj.registerD = (parentObj.registerD - 1) & 0xFF;
parentObj.FZero = (parentObj.registerD == 0);
parentObj.FHalfCarry = ((parentObj.registerD & 0xF) == 0xF);
parentObj.FSubtract = true;
},
//LD D, n
//#0x16:
function (parentObj) {
parentObj.registerD = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//RLA
//#0x17:
function (parentObj) {
var carry_flag = (parentObj.FCarry) ? 1 : 0;
parentObj.FCarry = (parentObj.registerA > 0x7F);
parentObj.registerA = ((parentObj.registerA << 1) & 0xFF) | carry_flag;
parentObj.FZero = parentObj.FSubtract = parentObj.FHalfCarry = false;
},
//JR n
//#0x18:
function (parentObj) {
parentObj.programCounter = (parentObj.programCounter + ((parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter) << 24) >> 24) + 1) & 0xFFFF;
},
//ADD HL, DE
//#0x19:
function (parentObj) {
var dirtySum = parentObj.registersHL + ((parentObj.registerD << 8) | parentObj.registerE);
parentObj.FHalfCarry = ((parentObj.registersHL & 0xFFF) > (dirtySum & 0xFFF));
parentObj.FCarry = (dirtySum > 0xFFFF);
parentObj.registersHL = dirtySum & 0xFFFF;
parentObj.FSubtract = false;
},
//LD A, (DE)
//#0x1A:
function (parentObj) {
parentObj.registerA = parentObj.memoryRead((parentObj.registerD << 8) | parentObj.registerE);
},
//DEC DE
//#0x1B:
function (parentObj) {
var temp_var = (((parentObj.registerD << 8) | parentObj.registerE) - 1) & 0xFFFF;
parentObj.registerD = temp_var >> 8;
parentObj.registerE = temp_var & 0xFF;
},
//INC E
//#0x1C:
function (parentObj) {
parentObj.registerE = (parentObj.registerE + 1) & 0xFF;
parentObj.FZero = (parentObj.registerE == 0);
parentObj.FHalfCarry = ((parentObj.registerE & 0xF) == 0);
parentObj.FSubtract = false;
},
//DEC E
//#0x1D:
function (parentObj) {
parentObj.registerE = (parentObj.registerE - 1) & 0xFF;
parentObj.FZero = (parentObj.registerE == 0);
parentObj.FHalfCarry = ((parentObj.registerE & 0xF) == 0xF);
parentObj.FSubtract = true;
},
//LD E, n
//#0x1E:
function (parentObj) {
parentObj.registerE = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//RRA
//#0x1F:
function (parentObj) {
var carry_flag = (parentObj.FCarry) ? 0x80 : 0;
parentObj.FCarry = ((parentObj.registerA & 1) == 1);
parentObj.registerA = (parentObj.registerA >> 1) | carry_flag;
parentObj.FZero = parentObj.FSubtract = parentObj.FHalfCarry = false;
},
//JR NZ, n
//#0x20:
function (parentObj) {
if (!parentObj.FZero) {
parentObj.programCounter = (parentObj.programCounter + ((parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter) << 24) >> 24) + 1) & 0xFFFF;
parentObj.CPUTicks += 4;
}
else {
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
}
},
//LD HL, nn
//#0x21:
function (parentObj) {
parentObj.registersHL = (parentObj.memoryRead((parentObj.programCounter + 1) & 0xFFFF) << 8) | parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 2) & 0xFFFF;
},
//LDI (HL), A
//#0x22:
function (parentObj) {
parentObj.memoryWriter[parentObj.registersHL](parentObj, parentObj.registersHL, parentObj.registerA);
parentObj.registersHL = (parentObj.registersHL + 1) & 0xFFFF;
},
//INC HL
//#0x23:
function (parentObj) {
parentObj.registersHL = (parentObj.registersHL + 1) & 0xFFFF;
},
//INC H
//#0x24:
function (parentObj) {
var H = ((parentObj.registersHL >> 8) + 1) & 0xFF;
parentObj.FZero = (H == 0);
parentObj.FHalfCarry = ((H & 0xF) == 0);
parentObj.FSubtract = false;
parentObj.registersHL = (H << 8) | (parentObj.registersHL & 0xFF);
},
//DEC H
//#0x25:
function (parentObj) {
var H = ((parentObj.registersHL >> 8) - 1) & 0xFF;
parentObj.FZero = (H == 0);
parentObj.FHalfCarry = ((H & 0xF) == 0xF);
parentObj.FSubtract = true;
parentObj.registersHL = (H << 8) | (parentObj.registersHL & 0xFF);
},
//LD H, n
//#0x26:
function (parentObj) {
parentObj.registersHL = (parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter) << 8) | (parentObj.registersHL & 0xFF);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//DAA
//#0x27:
function (parentObj) {
if (!parentObj.FSubtract) {
if (parentObj.FCarry || parentObj.registerA > 0x99) {
parentObj.registerA = (parentObj.registerA + 0x60) & 0xFF;
parentObj.FCarry = true;
}
if (parentObj.FHalfCarry || (parentObj.registerA & 0xF) > 0x9) {
parentObj.registerA = (parentObj.registerA + 0x06) & 0xFF;
parentObj.FHalfCarry = false;
}
}
else if (parentObj.FCarry && parentObj.FHalfCarry) {
parentObj.registerA = (parentObj.registerA + 0x9A) & 0xFF;
parentObj.FHalfCarry = false;
}
else if (parentObj.FCarry) {
parentObj.registerA = (parentObj.registerA + 0xA0) & 0xFF;
}
else if (parentObj.FHalfCarry) {
parentObj.registerA = (parentObj.registerA + 0xFA) & 0xFF;
parentObj.FHalfCarry = false;
}
parentObj.FZero = (parentObj.registerA == 0);
},
//JR Z, n
//#0x28:
function (parentObj) {
if (parentObj.FZero) {
parentObj.programCounter = (parentObj.programCounter + ((parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter) << 24) >> 24) + 1) & 0xFFFF;
parentObj.CPUTicks += 4;
}
else {
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
}
},
//ADD HL, HL
//#0x29:
function (parentObj) {
parentObj.FHalfCarry = ((parentObj.registersHL & 0xFFF) > 0x7FF);
parentObj.FCarry = (parentObj.registersHL > 0x7FFF);
parentObj.registersHL = (parentObj.registersHL << 1) & 0xFFFF;
parentObj.FSubtract = false;
},
//LDI A, (HL)
//#0x2A:
function (parentObj) {
parentObj.registerA = parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL);
parentObj.registersHL = (parentObj.registersHL + 1) & 0xFFFF;
},
//DEC HL
//#0x2B:
function (parentObj) {
parentObj.registersHL = (parentObj.registersHL - 1) & 0xFFFF;
},
//INC L
//#0x2C:
function (parentObj) {
var L = (parentObj.registersHL + 1) & 0xFF;
parentObj.FZero = (L == 0);
parentObj.FHalfCarry = ((L & 0xF) == 0);
parentObj.FSubtract = false;
parentObj.registersHL = (parentObj.registersHL & 0xFF00) | L;
},
//DEC L
//#0x2D:
function (parentObj) {
var L = (parentObj.registersHL - 1) & 0xFF;
parentObj.FZero = (L == 0);
parentObj.FHalfCarry = ((L & 0xF) == 0xF);
parentObj.FSubtract = true;
parentObj.registersHL = (parentObj.registersHL & 0xFF00) | L;
},
//LD L, n
//#0x2E:
function (parentObj) {
parentObj.registersHL = (parentObj.registersHL & 0xFF00) | parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//CPL
//#0x2F:
function (parentObj) {
parentObj.registerA ^= 0xFF;
parentObj.FSubtract = parentObj.FHalfCarry = true;
},
//JR NC, n
//#0x30:
function (parentObj) {
if (!parentObj.FCarry) {
parentObj.programCounter = (parentObj.programCounter + ((parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter) << 24) >> 24) + 1) & 0xFFFF;
parentObj.CPUTicks += 4;
}
else {
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
}
},
//LD SP, nn
//#0x31:
function (parentObj) {
parentObj.stackPointer = (parentObj.memoryRead((parentObj.programCounter + 1) & 0xFFFF) << 8) | parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 2) & 0xFFFF;
},
//LDD (HL), A
//#0x32:
function (parentObj) {
parentObj.memoryWriter[parentObj.registersHL](parentObj, parentObj.registersHL, parentObj.registerA);
parentObj.registersHL = (parentObj.registersHL - 1) & 0xFFFF;
},
//INC SP
//#0x33:
function (parentObj) {
parentObj.stackPointer = (parentObj.stackPointer + 1) & 0xFFFF;
},
//INC (HL)
//#0x34:
function (parentObj) {
var temp_var = (parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL) + 1) & 0xFF;
parentObj.FZero = (temp_var == 0);
parentObj.FHalfCarry = ((temp_var & 0xF) == 0);
parentObj.FSubtract = false;
parentObj.memoryWriter[parentObj.registersHL](parentObj, parentObj.registersHL, temp_var);
},
//DEC (HL)
//#0x35:
function (parentObj) {
var temp_var = (parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL) - 1) & 0xFF;
parentObj.FZero = (temp_var == 0);
parentObj.FHalfCarry = ((temp_var & 0xF) == 0xF);
parentObj.FSubtract = true;
parentObj.memoryWriter[parentObj.registersHL](parentObj, parentObj.registersHL, temp_var);
},
//LD (HL), n
//#0x36:
function (parentObj) {
parentObj.memoryWriter[parentObj.registersHL](parentObj, parentObj.registersHL, parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter));
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//SCF
//#0x37:
function (parentObj) {
parentObj.FCarry = true;
parentObj.FSubtract = parentObj.FHalfCarry = false;
},
//JR C, n
//#0x38:
function (parentObj) {
if (parentObj.FCarry) {
parentObj.programCounter = (parentObj.programCounter + ((parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter) << 24) >> 24) + 1) & 0xFFFF;
parentObj.CPUTicks += 4;
}
else {
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
}
},
//ADD HL, SP
//#0x39:
function (parentObj) {
var dirtySum = parentObj.registersHL + parentObj.stackPointer;
parentObj.FHalfCarry = ((parentObj.registersHL & 0xFFF) > (dirtySum & 0xFFF));
parentObj.FCarry = (dirtySum > 0xFFFF);
parentObj.registersHL = dirtySum & 0xFFFF;
parentObj.FSubtract = false;
},
//LDD A, (HL)
//#0x3A:
function (parentObj) {
parentObj.registerA = parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL);
parentObj.registersHL = (parentObj.registersHL - 1) & 0xFFFF;
},
//DEC SP
//#0x3B:
function (parentObj) {
parentObj.stackPointer = (parentObj.stackPointer - 1) & 0xFFFF;
},
//INC A
//#0x3C:
function (parentObj) {
parentObj.registerA = (parentObj.registerA + 1) & 0xFF;
parentObj.FZero = (parentObj.registerA == 0);
parentObj.FHalfCarry = ((parentObj.registerA & 0xF) == 0);
parentObj.FSubtract = false;
},
//DEC A
//#0x3D:
function (parentObj) {
parentObj.registerA = (parentObj.registerA - 1) & 0xFF;
parentObj.FZero = (parentObj.registerA == 0);
parentObj.FHalfCarry = ((parentObj.registerA & 0xF) == 0xF);
parentObj.FSubtract = true;
},
//LD A, n
//#0x3E:
function (parentObj) {
parentObj.registerA = parentObj.memoryReader[parentObj.programCounter](parentObj, parentObj.programCounter);
parentObj.programCounter = (parentObj.programCounter + 1) & 0xFFFF;
},
//CCF
//#0x3F:
function (parentObj) {
parentObj.FCarry = !parentObj.FCarry;
parentObj.FSubtract = parentObj.FHalfCarry = false;
},
//LD B, B
//#0x40:
function (parentObj) {
//Do nothing...
},
//LD B, C
//#0x41:
function (parentObj) {
parentObj.registerB = parentObj.registerC;
},
//LD B, D
//#0x42:
function (parentObj) {
parentObj.registerB = parentObj.registerD;
},
//LD B, E
//#0x43:
function (parentObj) {
parentObj.registerB = parentObj.registerE;
},
//LD B, H
//#0x44:
function (parentObj) {
parentObj.registerB = parentObj.registersHL >> 8;
},
//LD B, L
//#0x45:
function (parentObj) {
parentObj.registerB = parentObj.registersHL & 0xFF;
},
//LD B, (HL)
//#0x46:
function (parentObj) {
parentObj.registerB = parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL);
},
//LD B, A
//#0x47:
function (parentObj) {
parentObj.registerB = parentObj.registerA;
},
//LD C, B
//#0x48:
function (parentObj) {
parentObj.registerC = parentObj.registerB;
},
//LD C, C
//#0x49:
function (parentObj) {
//Do nothing...
},
//LD C, D
//#0x4A:
function (parentObj) {
parentObj.registerC = parentObj.registerD;
},
//LD C, E
//#0x4B:
function (parentObj) {
parentObj.registerC = parentObj.registerE;
},
//LD C, H
//#0x4C:
function (parentObj) {
parentObj.registerC = parentObj.registersHL >> 8;
},
//LD C, L
//#0x4D:
function (parentObj) {
parentObj.registerC = parentObj.registersHL & 0xFF;
},
//LD C, (HL)
//#0x4E:
function (parentObj) {
parentObj.registerC = parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL);
},
//LD C, A
//#0x4F:
function (parentObj) {
parentObj.registerC = parentObj.registerA;
},
//LD D, B
//#0x50:
function (parentObj) {
parentObj.registerD = parentObj.registerB;
},
//LD D, C
//#0x51:
function (parentObj) {
parentObj.registerD = parentObj.registerC;
},
//LD D, D
//#0x52:
function (parentObj) {
//Do nothing...
},
//LD D, E
//#0x53:
function (parentObj) {
parentObj.registerD = parentObj.registerE;
},
//LD D, H
//#0x54:
function (parentObj) {
parentObj.registerD = parentObj.registersHL >> 8;
},
//LD D, L
//#0x55:
function (parentObj) {
parentObj.registerD = parentObj.registersHL & 0xFF;
},
//LD D, (HL)
//#0x56:
function (parentObj) {
parentObj.registerD = parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL);
},
//LD D, A
//#0x57:
function (parentObj) {
parentObj.registerD = parentObj.registerA;
},
//LD E, B
//#0x58:
function (parentObj) {
parentObj.registerE = parentObj.registerB;
},
//LD E, C
//#0x59:
function (parentObj) {
parentObj.registerE = parentObj.registerC;
},
//LD E, D
//#0x5A:
function (parentObj) {
parentObj.registerE = parentObj.registerD;
},
//LD E, E
//#0x5B:
function (parentObj) {
//Do nothing...
},
//LD E, H
//#0x5C:
function (parentObj) {
parentObj.registerE = parentObj.registersHL >> 8;
},
//LD E, L
//#0x5D:
function (parentObj) {
parentObj.registerE = parentObj.registersHL & 0xFF;
},
//LD E, (HL)
//#0x5E:
function (parentObj) {
parentObj.registerE = parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL);
},
//LD E, A
//#0x5F:
function (parentObj) {
parentObj.registerE = parentObj.registerA;
},
//LD H, B
//#0x60:
function (parentObj) {
parentObj.registersHL = (parentObj.registerB << 8) | (parentObj.registersHL & 0xFF);
},
//LD H, C
//#0x61:
function (parentObj) {
parentObj.registersHL = (parentObj.registerC << 8) | (parentObj.registersHL & 0xFF);
},
//LD H, D
//#0x62:
function (parentObj) {
parentObj.registersHL = (parentObj.registerD << 8) | (parentObj.registersHL & 0xFF);
},
//LD H, E
//#0x63:
function (parentObj) {
parentObj.registersHL = (parentObj.registerE << 8) | (parentObj.registersHL & 0xFF);
},
//LD H, H
//#0x64:
function (parentObj) {
//Do nothing...
},
//LD H, L
//#0x65:
function (parentObj) {
parentObj.registersHL = (parentObj.registersHL & 0xFF) * 0x101;
},
//LD H, (HL)
//#0x66:
function (parentObj) {
parentObj.registersHL = (parentObj.memoryReader[parentObj.registersHL](parentObj, parentObj.registersHL) << 8) | (parentObj.registersHL & 0xFF);
},
//LD H, A
//#0x67:
function (parentObj) {
parentObj.registersHL = (parentObj.registerA << 8) | (parentObj.registersHL & 0xFF);
},
//LD L, B
//#0x68:
function (parentObj) {
parentObj.registersHL = (parentObj.registersHL & 0xFF00) | parentObj.registerB;
},
//LD L, C
//#0x69:
function (parentObj) {
parentObj.registersHL = (parentObj.registersHL & 0xFF00) | parentObj.registerC;
},