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cpu8080.js
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/**
* @fileoverview Emulation of the 8080 CPU
* @author <a href="mailto:[email protected]">Jeff Parsons</a>
* @copyright © 2012-2020 Jeff Parsons
* @license MIT
*
* This file is part of PCjs, a computer emulation software project at <https://www.pcjs.org>.
*/
"use strict";
/**
* Emulation of the 8080 CPU
*
* @class {CPU8080}
* @unrestricted
* @property {Bus} busIO
* @property {Bus} busMemory
* @property {Input} input
*/
class CPU8080 extends CPU {
/**
* CPU8080(idMachine, idDevice, config)
*
* @this {CPU8080}
* @param {string} idMachine
* @param {string} idDevice
* @param {Config} [config]
*/
constructor(idMachine, idDevice, config)
{
super(idMachine, idDevice, config);
/*
* Initialize the CPU.
*/
this.initCPU();
/*
* Get access to the Bus devices, so we have access to the I/O and memory address spaces.
*/
this.busIO = /** @type {Bus} */ (this.findDevice(this.config['busIO']));
this.busMemory = /** @type {Bus} */ (this.findDevice(this.config['busMemory']));
/*
* Get access to the Input device, so we can call setFocus() as needed.
*/
this.input = /** @type {Input} */ (this.findDeviceByClass("Input", false));
}
/**
* execute(nCycles)
*
* Called from startClock() to execute a series of instructions.
*
* Executes the specified "burst" of instructions. This code exists outside of the startClock() function
* to ensure that its try/catch exception handler doesn't interfere with the optimization of this tight loop.
*
* @this {CPU8080}
* @param {number} nCycles
*/
execute(nCycles)
{
/*
* If checkINTR() returns false, INTFLAG.HALT must be set, so no instructions should be executed.
*/
if (!this.checkINTR()) return;
while (this.nCyclesRemain > 0) {
this.regPCLast = this.regPC;
this.aOps[this.getPCByte()].call(this);
}
}
/**
* initCPU()
*
* Initializes the CPU's state.
*
* @this {CPU8080}
*/
initCPU()
{
this.resetRegs()
this.defineRegister("A", () => this.regA, (value) => this.regA = value & 0xff);
this.defineRegister("B", () => this.regB, (value) => this.regB = value & 0xff);
this.defineRegister("C", () => this.regC, (value) => this.regC = value & 0xff);
this.defineRegister("D", () => this.regD, (value) => this.regD = value & 0xff);
this.defineRegister("E", () => this.regE, (value) => this.regE = value & 0xff);
this.defineRegister("H", () => this.regH, (value) => this.regH = value & 0xff);
this.defineRegister("L", () => this.regL, (value) => this.regL = value & 0xff);
this.defineRegister("CF", () => (this.getCF()? 1 : 0), (value) => {value? this.setCF() : this.clearCF()});
this.defineRegister("PF", () => (this.getPF()? 1 : 0), (value) => {value? this.setPF() : this.clearPF()});
this.defineRegister("AF", () => (this.getAF()? 1 : 0), (value) => {value? this.setAF() : this.clearAF()});
this.defineRegister("ZF", () => (this.getZF()? 1 : 0), (value) => {value? this.setZF() : this.clearZF()});
this.defineRegister("SF", () => (this.getSF()? 1 : 0), (value) => {value? this.setSF() : this.clearSF()});
this.defineRegister("IF", () => (this.getIF()? 1 : 0), (value) => {value? this.setIF() : this.clearIF()});
this.defineRegister("BC", this.getBC, this.setBC);
this.defineRegister("DE", this.getDE, this.setDE);
this.defineRegister("HL", this.getHL, this.setHL);
this.defineRegister(Debugger.REGISTER.PC, this.getPC, this.setPC);
/*
* This 256-entry array of opcode functions is at the heart of the CPU engine.
*
* It might be worth trying a switch() statement instead, to see how the performance compares,
* but I suspect that would vary quite a bit across JavaScript engines; for now, I'm putting my
* money on array lookup.
*/
this.aOps = [
/* 0x00-0x03 */ this.opNOP, this.opLXIB, this.opSTAXB, this.opINXB,
/* 0x04-0x07 */ this.opINRB, this.opDCRB, this.opMVIB, this.opRLC,
/* 0x08-0x0B */ this.opNOP, this.opDADB, this.opLDAXB, this.opDCXB,
/* 0x0C-0x0F */ this.opINRC, this.opDCRC, this.opMVIC, this.opRRC,
/* 0x10-0x13 */ this.opNOP, this.opLXID, this.opSTAXD, this.opINXD,
/* 0x14-0x17 */ this.opINRD, this.opDCRD, this.opMVID, this.opRAL,
/* 0x18-0x1B */ this.opNOP, this.opDADD, this.opLDAXD, this.opDCXD,
/* 0x1C-0x1F */ this.opINRE, this.opDCRE, this.opMVIE, this.opRAR,
/* 0x20-0x23 */ this.opNOP, this.opLXIH, this.opSHLD, this.opINXH,
/* 0x24-0x27 */ this.opINRH, this.opDCRH, this.opMVIH, this.opDAA,
/* 0x28-0x2B */ this.opNOP, this.opDADH, this.opLHLD, this.opDCXH,
/* 0x2C-0x2F */ this.opINRL, this.opDCRL, this.opMVIL, this.opCMA,
/* 0x30-0x33 */ this.opNOP, this.opLXISP, this.opSTA, this.opINXSP,
/* 0x34-0x37 */ this.opINRM, this.opDCRM, this.opMVIM, this.opSTC,
/* 0x38-0x3B */ this.opNOP, this.opDADSP, this.opLDA, this.opDCXSP,
/* 0x3C-0x3F */ this.opINRA, this.opDCRA, this.opMVIA, this.opCMC,
/* 0x40-0x43 */ this.opMOVBB, this.opMOVBC, this.opMOVBD, this.opMOVBE,
/* 0x44-0x47 */ this.opMOVBH, this.opMOVBL, this.opMOVBM, this.opMOVBA,
/* 0x48-0x4B */ this.opMOVCB, this.opMOVCC, this.opMOVCD, this.opMOVCE,
/* 0x4C-0x4F */ this.opMOVCH, this.opMOVCL, this.opMOVCM, this.opMOVCA,
/* 0x50-0x53 */ this.opMOVDB, this.opMOVDC, this.opMOVDD, this.opMOVDE,
/* 0x54-0x57 */ this.opMOVDH, this.opMOVDL, this.opMOVDM, this.opMOVDA,
/* 0x58-0x5B */ this.opMOVEB, this.opMOVEC, this.opMOVED, this.opMOVEE,
/* 0x5C-0x5F */ this.opMOVEH, this.opMOVEL, this.opMOVEM, this.opMOVEA,
/* 0x60-0x63 */ this.opMOVHB, this.opMOVHC, this.opMOVHD, this.opMOVHE,
/* 0x64-0x67 */ this.opMOVHH, this.opMOVHL, this.opMOVHM, this.opMOVHA,
/* 0x68-0x6B */ this.opMOVLB, this.opMOVLC, this.opMOVLD, this.opMOVLE,
/* 0x6C-0x6F */ this.opMOVLH, this.opMOVLL, this.opMOVLM, this.opMOVLA,
/* 0x70-0x73 */ this.opMOVMB, this.opMOVMC, this.opMOVMD, this.opMOVME,
/* 0x74-0x77 */ this.opMOVMH, this.opMOVML, this.opHLT, this.opMOVMA,
/* 0x78-0x7B */ this.opMOVAB, this.opMOVAC, this.opMOVAD, this.opMOVAE,
/* 0x7C-0x7F */ this.opMOVAH, this.opMOVAL, this.opMOVAM, this.opMOVAA,
/* 0x80-0x83 */ this.opADDB, this.opADDC, this.opADDD, this.opADDE,
/* 0x84-0x87 */ this.opADDH, this.opADDL, this.opADDM, this.opADDA,
/* 0x88-0x8B */ this.opADCB, this.opADCC, this.opADCD, this.opADCE,
/* 0x8C-0x8F */ this.opADCH, this.opADCL, this.opADCM, this.opADCA,
/* 0x90-0x93 */ this.opSUBB, this.opSUBC, this.opSUBD, this.opSUBE,
/* 0x94-0x97 */ this.opSUBH, this.opSUBL, this.opSUBM, this.opSUBA,
/* 0x98-0x9B */ this.opSBBB, this.opSBBC, this.opSBBD, this.opSBBE,
/* 0x9C-0x9F */ this.opSBBH, this.opSBBL, this.opSBBM, this.opSBBA,
/* 0xA0-0xA3 */ this.opANAB, this.opANAC, this.opANAD, this.opANAE,
/* 0xA4-0xA7 */ this.opANAH, this.opANAL, this.opANAM, this.opANAA,
/* 0xA8-0xAB */ this.opXRAB, this.opXRAC, this.opXRAD, this.opXRAE,
/* 0xAC-0xAF */ this.opXRAH, this.opXRAL, this.opXRAM, this.opXRAA,
/* 0xB0-0xB3 */ this.opORAB, this.opORAC, this.opORAD, this.opORAE,
/* 0xB4-0xB7 */ this.opORAH, this.opORAL, this.opORAM, this.opORAA,
/* 0xB8-0xBB */ this.opCMPB, this.opCMPC, this.opCMPD, this.opCMPE,
/* 0xBC-0xBF */ this.opCMPH, this.opCMPL, this.opCMPM, this.opCMPA,
/* 0xC0-0xC3 */ this.opRNZ, this.opPOPB, this.opJNZ, this.opJMP,
/* 0xC4-0xC7 */ this.opCNZ, this.opPUSHB, this.opADI, this.opRST0,
/* 0xC8-0xCB */ this.opRZ, this.opRET, this.opJZ, this.opJMP,
/* 0xCC-0xCF */ this.opCZ, this.opCALL, this.opACI, this.opRST1,
/* 0xD0-0xD3 */ this.opRNC, this.opPOPD, this.opJNC, this.opOUT,
/* 0xD4-0xD7 */ this.opCNC, this.opPUSHD, this.opSUI, this.opRST2,
/* 0xD8-0xDB */ this.opRC, this.opRET, this.opJC, this.opIN,
/* 0xDC-0xDF */ this.opCC, this.opCALL, this.opSBI, this.opRST3,
/* 0xE0-0xE3 */ this.opRPO, this.opPOPH, this.opJPO, this.opXTHL,
/* 0xE4-0xE7 */ this.opCPO, this.opPUSHH, this.opANI, this.opRST4,
/* 0xE8-0xEB */ this.opRPE, this.opPCHL, this.opJPE, this.opXCHG,
/* 0xEC-0xEF */ this.opCPE, this.opCALL, this.opXRI, this.opRST5,
/* 0xF0-0xF3 */ this.opRP, this.opPOPSW, this.opJP, this.opDI,
/* 0xF4-0xF7 */ this.opCP, this.opPUPSW, this.opORI, this.opRST6,
/* 0xF8-0xFB */ this.opRM, this.opSPHL, this.opJM, this.opEI,
/* 0xFC-0xFF */ this.opCM, this.opCALL, this.opCPI, this.opRST7
];
}
/**
* loadState(stateCPU)
*
* If any saved values don't match (possibly overridden), abandon the given state and return false.
*
* @this {CPU8080}
* @param {Array} stateCPU
* @returns {boolean}
*/
loadState(stateCPU)
{
if (!stateCPU || !stateCPU.length) {
this.println("invalid saved state");
return false;
}
let idDevice = stateCPU.shift();
let version = stateCPU.shift();
if (idDevice != this.idDevice || (version|0) !== (+VERSION|0)) {
this.printf("CPU state mismatch (%s %3.2f)\n", idDevice, version);
return false;
}
try {
this.regA = stateCPU.shift();
this.regB = stateCPU.shift();
this.regC = stateCPU.shift();
this.regD = stateCPU.shift();
this.regE = stateCPU.shift();
this.regH = stateCPU.shift();
this.regL = stateCPU.shift();
this.setPC(stateCPU.shift());
this.setSP(stateCPU.shift());
this.setPS(stateCPU.shift());
this.intFlags = stateCPU.shift();
} catch(err) {
this.println("CPU state error: " + err.message);
return false;
}
return true;
}
/**
* saveState(stateCPU)
*
* @this {CPU8080}
* @param {Array} stateCPU
*/
saveState(stateCPU)
{
stateCPU.push(this.idDevice);
stateCPU.push(+VERSION);
stateCPU.push(this.regA);
stateCPU.push(this.regB);
stateCPU.push(this.regC);
stateCPU.push(this.regD);
stateCPU.push(this.regE);
stateCPU.push(this.regH);
stateCPU.push(this.regL);
stateCPU.push(this.getPC());
stateCPU.push(this.getSP());
stateCPU.push(this.getPS());
stateCPU.push(this.intFlags);
}
/**
* onLoad(state)
*
* Automatically called by the Machine device if the machine's 'autoSave' property is true.
*
* @this {CPU8080}
* @param {Array} state
* @returns {boolean}
*/
onLoad(state)
{
if (state) {
let stateCPU = state[0];
if (this.loadState(stateCPU)) {
state.shift();
return true;
}
}
return false;
}
/**
* onPower(on)
*
* Called by the Machine device to provide notification of a power event.
*
* @this {CPU8080}
* @param {boolean} on (true to power on, false to power off)
*/
onPower(on)
{
if (on) {
this.time.start();
if (this.input) this.input.setFocus();
} else {
this.time.stop();
}
}
/**
* onReset()
*
* Called by the Machine device to provide notification of a reset event.
*
* @this {CPU8080}
*/
onReset()
{
this.println("reset");
this.resetRegs();
if (!this.time.isRunning()) this.print(this.toString());
}
/**
* onSave(state)
*
* Automatically called by the Machine device before all other devices have been powered down (eg, during
* a page unload event).
*
* @this {CPU8080}
* @param {Array} state
*/
onSave(state)
{
let stateCPU = [];
this.saveState(stateCPU);
state.push(stateCPU);
}
/**
* onUpdate(fTransition)
*
* Enumerate all bindings and update their values.
*
* Called by Time's update() function whenever 1) its YIELDS_PER_UPDATE threshold is reached
* (default is twice per second), 2) a step() operation has just finished (ie, the device is being
* single-stepped), and 3) a start() or stop() transition has occurred.
*
* @this {CPU8080}
* @param {boolean} [fTransition]
*/
onUpdate(fTransition)
{
// TODO: Decide what bindings we want to support, and update them as appropriate.
}
/**
* op=0x00 (NOP)
*
* @this {CPU8080}
*/
opNOP()
{
this.nCyclesRemain -= 4;
}
/**
* op=0x01 (LXI B,d16)
*
* @this {CPU8080}
*/
opLXIB()
{
this.setBC(this.getPCWord());
this.nCyclesRemain -= 10;
}
/**
* op=0x02 (STAX B)
*
* @this {CPU8080}
*/
opSTAXB()
{
this.setByte(this.getBC(), this.regA);
this.nCyclesRemain -= 7;
}
/**
* op=0x03 (INX B)
*
* @this {CPU8080}
*/
opINXB()
{
this.setBC(this.getBC() + 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x04 (INR B)
*
* @this {CPU8080}
*/
opINRB()
{
this.regB = this.incByte(this.regB);
this.nCyclesRemain -= 5;
}
/**
* op=0x05 (DCR B)
*
* @this {CPU8080}
*/
opDCRB()
{
this.regB = this.decByte(this.regB);
this.nCyclesRemain -= 5;
}
/**
* op=0x06 (MVI B,d8)
*
* @this {CPU8080}
*/
opMVIB()
{
this.regB = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x07 (RLC)
*
* @this {CPU8080}
*/
opRLC()
{
let carry = this.regA << 1;
this.regA = (carry & 0xff) | (carry >> 8);
this.updateCF(carry & 0x100);
this.nCyclesRemain -= 4;
}
/**
* op=0x09 (DAD B)
*
* @this {CPU8080}
*/
opDADB()
{
let w;
this.setHL(w = this.getHL() + this.getBC());
this.updateCF((w >> 8) & 0x100);
this.nCyclesRemain -= 10;
}
/**
* op=0x0A (LDAX B)
*
* @this {CPU8080}
*/
opLDAXB()
{
this.regA = this.getByte(this.getBC());
this.nCyclesRemain -= 7;
}
/**
* op=0x0B (DCX B)
*
* @this {CPU8080}
*/
opDCXB()
{
this.setBC(this.getBC() - 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x0C (INR C)
*
* @this {CPU8080}
*/
opINRC()
{
this.regC = this.incByte(this.regC);
this.nCyclesRemain -= 5;
}
/**
* op=0x0D (DCR C)
*
* @this {CPU8080}
*/
opDCRC()
{
this.regC = this.decByte(this.regC);
this.nCyclesRemain -= 5;
}
/**
* op=0x0E (MVI C,d8)
*
* @this {CPU8080}
*/
opMVIC()
{
this.regC = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x0F (RRC)
*
* @this {CPU8080}
*/
opRRC()
{
let carry = (this.regA << 8) & 0x100;
this.regA = (carry | this.regA) >> 1;
this.updateCF(carry);
this.nCyclesRemain -= 4;
}
/**
* op=0x11 (LXI D,d16)
*
* @this {CPU8080}
*/
opLXID()
{
this.setDE(this.getPCWord());
this.nCyclesRemain -= 10;
}
/**
* op=0x12 (STAX D)
*
* @this {CPU8080}
*/
opSTAXD()
{
this.setByte(this.getDE(), this.regA);
this.nCyclesRemain -= 7;
}
/**
* op=0x13 (INX D)
*
* @this {CPU8080}
*/
opINXD()
{
this.setDE(this.getDE() + 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x14 (INR D)
*
* @this {CPU8080}
*/
opINRD()
{
this.regD = this.incByte(this.regD);
this.nCyclesRemain -= 5;
}
/**
* op=0x15 (DCR D)
*
* @this {CPU8080}
*/
opDCRD()
{
this.regD = this.decByte(this.regD);
this.nCyclesRemain -= 5;
}
/**
* op=0x16 (MVI D,d8)
*
* @this {CPU8080}
*/
opMVID()
{
this.regD = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x17 (RAL)
*
* @this {CPU8080}
*/
opRAL()
{
let carry = this.regA << 1;
this.regA = (carry & 0xff) | this.getCF();
this.updateCF(carry & 0x100);
this.nCyclesRemain -= 4;
}
/**
* op=0x19 (DAD D)
*
* @this {CPU8080}
*/
opDADD()
{
let w;
this.setHL(w = this.getHL() + this.getDE());
this.updateCF((w >> 8) & 0x100);
this.nCyclesRemain -= 10;
}
/**
* op=0x1A (LDAX D)
*
* @this {CPU8080}
*/
opLDAXD()
{
this.regA = this.getByte(this.getDE());
this.nCyclesRemain -= 7;
}
/**
* op=0x1B (DCX D)
*
* @this {CPU8080}
*/
opDCXD()
{
this.setDE(this.getDE() - 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x1C (INR E)
*
* @this {CPU8080}
*/
opINRE()
{
this.regE = this.incByte(this.regE);
this.nCyclesRemain -= 5;
}
/**
* op=0x1D (DCR E)
*
* @this {CPU8080}
*/
opDCRE()
{
this.regE = this.decByte(this.regE);
this.nCyclesRemain -= 5;
}
/**
* op=0x1E (MVI E,d8)
*
* @this {CPU8080}
*/
opMVIE()
{
this.regE = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x1F (RAR)
*
* @this {CPU8080}
*/
opRAR()
{
let carry = (this.regA << 8);
this.regA = ((this.getCF() << 8) | this.regA) >> 1;
this.updateCF(carry & 0x100);
this.nCyclesRemain -= 4;
}
/**
* op=0x21 (LXI H,d16)
*
* @this {CPU8080}
*/
opLXIH()
{
this.setHL(this.getPCWord());
this.nCyclesRemain -= 10;
}
/**
* op=0x22 (SHLD a16)
*
* @this {CPU8080}
*/
opSHLD()
{
this.setWord(this.getPCWord(), this.getHL());
this.nCyclesRemain -= 16;
}
/**
* op=0x23 (INX H)
*
* @this {CPU8080}
*/
opINXH()
{
this.setHL(this.getHL() + 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x24 (INR H)
*
* @this {CPU8080}
*/
opINRH()
{
this.regH = this.incByte(this.regH);
this.nCyclesRemain -= 5;
}
/**
* op=0x25 (DCR H)
*
* @this {CPU8080}
*/
opDCRH()
{
this.regH = this.decByte(this.regH);
this.nCyclesRemain -= 5;
}
/**
* op=0x26 (MVI H,d8)
*
* @this {CPU8080}
*/
opMVIH()
{
this.regH = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x27 (DAA)
*
* @this {CPU8080}
*/
opDAA()
{
let src = 0;
let CF = this.getCF();
let AF = this.getAF();
if (AF || (this.regA & 0x0F) > 9) {
src |= 0x06;
}
if (CF || this.regA >= 0x9A) {
src |= 0x60;
CF = CPU8080.PS.CF;
}
this.regA = this.addByte(src);
this.updateCF(CF? 0x100 : 0);
this.nCyclesRemain -= 4;
}
/**
* op=0x29 (DAD H)
*
* @this {CPU8080}
*/
opDADH()
{
let w;
this.setHL(w = this.getHL() + this.getHL());
this.updateCF((w >> 8) & 0x100);
this.nCyclesRemain -= 10;
}
/**
* op=0x2A (LHLD a16)
*
* @this {CPU8080}
*/
opLHLD()
{
this.setHL(this.getWord(this.getPCWord()));
this.nCyclesRemain -= 16;
}
/**
* op=0x2B (DCX H)
*
* @this {CPU8080}
*/
opDCXH()
{
this.setHL(this.getHL() - 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x2C (INR L)
*
* @this {CPU8080}
*/
opINRL()
{
this.regL = this.incByte(this.regL);
this.nCyclesRemain -= 5;
}
/**
* op=0x2D (DCR L)
*
* @this {CPU8080}
*/
opDCRL()
{
this.regL = this.decByte(this.regL);
this.nCyclesRemain -= 5;
}
/**
* op=0x2E (MVI L,d8)
*
* @this {CPU8080}
*/
opMVIL()
{
this.regL = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x2F (CMA)
*
* @this {CPU8080}
*/
opCMA()
{
this.regA = ~this.regA & 0xff;
this.nCyclesRemain -= 4;
}
/**
* op=0x31 (LXI SP,d16)
*
* @this {CPU8080}
*/
opLXISP()
{
this.setSP(this.getPCWord());
this.nCyclesRemain -= 10;
}
/**
* op=0x32 (STA a16)
*
* @this {CPU8080}
*/
opSTA()
{
this.setByte(this.getPCWord(), this.regA);
this.nCyclesRemain -= 13;
}
/**
* op=0x33 (INX SP)
*
* @this {CPU8080}
*/
opINXSP()
{
this.setSP(this.getSP() + 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x34 (INR M)
*
* @this {CPU8080}
*/
opINRM()
{
let addr = this.getHL();
this.setByte(addr, this.incByte(this.getByte(addr)));
this.nCyclesRemain -= 10;
}
/**
* op=0x35 (DCR M)
*
* @this {CPU8080}
*/
opDCRM()
{
let addr = this.getHL();
this.setByte(addr, this.decByte(this.getByte(addr)));
this.nCyclesRemain -= 10;
}
/**
* op=0x36 (MVI M,d8)
*
* @this {CPU8080}
*/
opMVIM()
{
this.setByte(this.getHL(), this.getPCByte());
this.nCyclesRemain -= 10;
}
/**
* op=0x37 (STC)
*
* @this {CPU8080}
*/
opSTC()
{
this.setCF();
this.nCyclesRemain -= 4;
}
/**
* op=0x39 (DAD SP)
*
* @this {CPU8080}
*/
opDADSP()
{
let w;
this.setHL(w = this.getHL() + this.getSP());
this.updateCF((w >> 8) & 0x100);
this.nCyclesRemain -= 10;
}
/**
* op=0x3A (LDA a16)
*
* @this {CPU8080}
*/
opLDA()
{
this.regA = this.getByte(this.getPCWord());
this.nCyclesRemain -= 13;
}
/**
* op=0x3B (DCX SP)
*
* @this {CPU8080}
*/
opDCXSP()
{
this.setSP(this.getSP() - 1);
this.nCyclesRemain -= 5;
}
/**
* op=0x3C (INR A)
*
* @this {CPU8080}
*/
opINRA()
{
this.regA = this.incByte(this.regA);
this.nCyclesRemain -= 5;
}
/**
* op=0x3D (DCR A)
*
* @this {CPU8080}
*/
opDCRA()
{
this.regA = this.decByte(this.regA);
this.nCyclesRemain -= 5;
}
/**
* op=0x3E (MVI A,d8)
*
* @this {CPU8080}
*/
opMVIA()
{
this.regA = this.getPCByte();
this.nCyclesRemain -= 7;
}
/**
* op=0x3F (CMC)
*
* @this {CPU8080}
*/
opCMC()
{
this.updateCF(this.getCF()? 0 : 0x100);
this.nCyclesRemain -= 4;
}
/**
* op=0x40 (MOV B,B)
*
* @this {CPU8080}
*/
opMOVBB()
{
this.nCyclesRemain -= 5;
}
/**
* op=0x41 (MOV B,C)
*
* @this {CPU8080}
*/
opMOVBC()
{
this.regB = this.regC;