apple2js/js/cpu6502.ts

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/*
* Copyright 2010-2021 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
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import { Memory, MemoryPages, byte, word } from './types';
import { debug, toHex } from './util';
export interface CpuOptions {
'65C02'?: boolean;
}
export interface CpuState {
a: byte,
x: byte,
y: byte,
s: byte,
pc: word,
sp: byte,
cycles: number
}
export type Mode =
'accumulator' | // A (Accumulator)
'implied' | // Implied
'immediate' | // # Immediate
'absolute' | // a Absolute
'zeroPage' | // zp Zero Page
'relative' | // r Relative
'absoluteX' | // a,X Absolute, X
'absoluteY' | // a,Y Absolute, Y
'zeroPageX' | // zp,X Zero Page, X
'zeroPageY' | // zp,Y Zero Page, Y
'absoluteIndirect' | // (a) Indirect
'zeroPageXIndirect' | // (zp,X) Zero Page Indexed Indirect
'zeroPageIndirectY' | // (zp),Y Zero Page Indexed with Y
'zeroPageIndirect' | // (zp),
'absoluteXIndirect' | // (a, X),
'zeroPage_relative'; // zp, Relative
export type Modes = Record<Mode, number>;
/** Addressing mode name to instruction size mapping. */
export const sizes: Modes = {
accumulator: 1,
implied: 1,
immediate: 2,
absolute: 3,
zeroPage: 2,
relative: 2,
absoluteX: 3,
absoluteY: 3,
zeroPageX: 2,
zeroPageY: 2,
absoluteIndirect: 3,
zeroPageXIndirect: 2,
zeroPageIndirectY: 2,
/* 65c02 */
zeroPageIndirect: 2,
absoluteXIndirect: 3,
zeroPage_relative: 3
};
/** Status register flag numbers. */
export type flag = 0x80 | 0x40 | 0x20 | 0x10 | 0x08 | 0x04 | 0x02 | 0x01;
export type DebugInfo = {
pc: word,
ar: byte,
xr: byte,
yr: byte,
sr: byte,
sp: byte,
cmd: byte[],
};
/** Flags to status byte mask. */
export const flags: { [key: string]: flag } = {
N: 0x80, // Negative
V: 0x40, // oVerflow
B: 0x10, // Break
D: 0x08, // Decimal
I: 0x04, // Interrupt
Z: 0x02, // Zero
C: 0x01 // Carry
};
/** CPU-referenced memory locations. */
const loc = {
STACK: 0x100,
NMI: 0xFFFA,
RESET: 0xFFFC,
BRK: 0xFFFE
};
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interface ResettablePageHandler extends MemoryPages {
reset(): void;
}
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function isResettablePageHandler(pageHandler: MemoryPages | ResettablePageHandler): pageHandler is ResettablePageHandler {
return (pageHandler as ResettablePageHandler).reset !== undefined;
}
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const BLANK_PAGE: Memory = {
read: function () { return 0; },
write: function () { }
};
interface Opts {
rwm?: boolean;
}
type ReadFn = () => byte;
type WriteFn = (val: byte) => void;
type ReadAddrFn = (opts?: Opts) => word;
type ImpliedFn = () => void
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interface Instruction<T = any> {
name: string
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mode: Mode
op: (fn: T) => void
modeFn: T
}
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type StrictInstruction =
Instruction<ReadFn> |
Instruction<WriteFn> |
Instruction<ReadAddrFn> |
Instruction<ImpliedFn> |
Instruction<flag> |
Instruction<flag|0> |
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Instruction<byte>
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type Instructions = Record<byte, StrictInstruction>
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type callback = (cpu: CPU6502) => void;
export default class CPU6502 {
private readonly is65C02: boolean;
/* Registers */
private pc: word = 0; // Program Counter
private sr: byte = 0x20; // Process Status Register
private ar: byte = 0; // Accumulator
private xr: byte = 0; // X Register
private yr: byte = 0; // Y Register
private sp: byte = 0xff; // Stack Pointer
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private memPages: Memory[] = new Array(0x100);
private resetHandlers: ResettablePageHandler[] = [];
private cycles = 0;
private sync = false;
private readonly opary: Instruction[];
constructor(options: CpuOptions = {}) {
this.is65C02 = options['65C02'] ? true : false;
this.memPages.fill(BLANK_PAGE);
this.memPages.fill(BLANK_PAGE);
// Create this CPU's instruction table
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let ops = { ...this.OPS_6502 };
if (this.is65C02) {
ops = { ...ops, ...this.OPS_65C02 };
}
// Certain browsers benefit from using arrays over maps
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const opary: Instruction[] = new Array(0x100);
for (let idx = 0; idx < 0x100; idx++) {
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opary[idx] = ops[idx] || this.unknown(idx);
}
this.opary = opary;
}
/**
* Set or clears `f` in the status register. `f` must be a byte with a
* single bit set.
*/
private setFlag(f: flag, on: boolean) {
this.sr = on ? (this.sr | f) : (this.sr & ~f);
}
/** Updates the status register's zero flag and negative flag. */
private testNZ(val: byte) {
this.sr = val === 0 ? (this.sr | flags.Z) : (this.sr & ~flags.Z);
this.sr = (val & 0x80) ? (this.sr | flags.N) : (this.sr & ~flags.N);
return val;
}
/** Updates the status register's zero flag. */
private testZ(val: byte) {
this.sr = val === 0 ? (this.sr | flags.Z) : (this.sr & ~flags.Z);
return val;
}
/**
* Returns `a + b`, unless `sub` is true, in which case it performs
* `a - b`. The status register is updated according to the result.
*/
private add(a: byte, b: byte, sub: boolean) {
// KEGS
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let c, v;
if ((this.sr & flags.D) !== 0) {
// BCD
c = (a & 0x0f) + (b & 0x0f) + (this.sr & flags.C);
if (sub) {
if (c < 0x10)
c = (c - 0x06) & 0x0f;
c += (a & 0xf0) + (b & 0xf0);
v = (c >> 1) ^ c;
if (c < 0x100)
c = (c + 0xa0) & 0xff;
} else {
if (c > 0x09)
c = (c - 0x0a) | 0x10; // carry to MSN
c += (a & 0xf0) + (b & 0xf0);
v = (c >> 1) ^ c;
if (c > 0x99)
c += 0x60;
}
} else {
c = a + b + (this.sr & flags.C);
v = (c ^ a) & 0x80;
}
if (((a ^ b) & 0x80) !== 0) {
v = 0;
}
this.setFlag(flags.C, c > 0xff);
this.setFlag(flags.V, !!v);
return this.testNZ(c & 0xff);
}
/** Increments `a` and returns the value, setting the status register. */
private increment(a: byte) {
return this.testNZ((a + 0x01) & 0xff);
}
private decrement(a: byte) {
return this.testNZ((a + 0xff) & 0xff);
}
private readBytePC(): byte {
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const addr = this.pc,
page = addr >> 8,
off = addr & 0xff;
const result = this.memPages[page].read(page, off);
this.pc = (this.pc + 1) & 0xffff;
this.cycles++;
return result;
}
private readByte(addr: word): byte {
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const page = addr >> 8,
off = addr & 0xff;
const result = this.memPages[page].read(page, off);
this.cycles++;
return result;
}
private readByteDebug(addr: word) {
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const page = addr >> 8,
off = addr & 0xff;
return this.memPages[page].read(page, off);
}
private writeByte(addr: word, val: byte) {
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const page = addr >> 8,
off = addr & 0xff;
this.memPages[page].write(page, off, val);
this.cycles++;
}
private readWord(addr: word): word {
return this.readByte(addr) | (this.readByte(addr + 1) << 8);
}
private readWordPC(): word {
return this.readBytePC() | (this.readBytePC() << 8);
}
private readZPWord(addr: byte): word {
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const lsb = this.readByte(addr & 0xff);
const msb = this.readByte((addr + 1) & 0xff);
return (msb << 8) | lsb;
}
private pushByte(val: byte) {
this.writeByte(loc.STACK | this.sp, val);
this.sp = (this.sp + 0xff) & 0xff;
}
private pushWord(val: word) {
this.pushByte(val >> 8);
this.pushByte(val & 0xff);
}
private pullByte(): byte {
this.sp = (this.sp + 0x01) & 0xff;
return this.readByte(loc.STACK | this.sp);
}
private pullWordRaw(): word {
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const lsb = this.pullByte();
const msb = this.pullByte();
return (msb << 8) | lsb;
}
/*
* Implied function
*/
implied() {
}
/*
* Read functions
*/
// #$00
readImmediate = (): byte => {
return this.readBytePC();
}
// $0000
readAbsolute = (): byte => {
return this.readByte(this.readWordPC());
}
// $00
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readZeroPage = (): byte => {
return this.readByte(this.readBytePC());
}
// $0000,X
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readAbsoluteX = (): byte => {
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let addr = this.readWordPC();
const oldPage = addr >> 8;
addr = (addr + this.xr) & 0xffff;
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const newPage = addr >> 8;
if (newPage != oldPage) {
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const off = addr & 0xff;
this.readByte(oldPage << 8 | off);
}
return this.readByte(addr);
}
// $0000,Y
readAbsoluteY = (): byte => {
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let addr = this.readWordPC();
const oldPage = addr >> 8;
addr = (addr + this.yr) & 0xffff;
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const newPage = addr >> 8;
if (newPage != oldPage) {
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const off = addr & 0xff;
this.readByte(oldPage << 8 | off);
}
return this.readByte(addr);
}
// $00,X
readZeroPageX = (): byte => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
return this.readByte((zpAddr + this.xr) & 0xff);
}
// $00,Y
readZeroPageY = (): byte => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
return this.readByte((zpAddr + this.yr) & 0xff);
}
// ($00,X)
readZeroPageXIndirect = (): byte => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
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const addr = this.readZPWord((zpAddr + this.xr) & 0xff);
return this.readByte(addr);
}
// ($00),Y
readZeroPageIndirectY = (): byte => {
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let addr = this.readZPWord(this.readBytePC());
const oldPage = addr >> 8;
addr = (addr + this.yr) & 0xffff;
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const newPage = addr >> 8;
if (newPage != oldPage) {
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const off = addr & 0xff;
this.readByte(oldPage << 8 | off);
}
return this.readByte(addr);
}
// ($00) (65C02)
readZeroPageIndirect = (): byte => {
return this.readByte(this.readZPWord(this.readBytePC()));
}
/*
* Write Functions
*/
// $0000
writeAbsolute = (val: byte) => {
this.writeByte(this.readWordPC(), val);
}
// $00
writeZeroPage = (val: byte) => {
this.writeByte(this.readBytePC(), val);
}
// $0000,X
writeAbsoluteX = (val: byte) => {
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let addr = this.readWordPC();
const oldPage = addr >> 8;
addr = (addr + this.xr) & 0xffff;
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const off = addr & 0xff;
this.readByte(oldPage << 8 | off);
this.writeByte(addr, val);
}
// $0000,Y
writeAbsoluteY = (val: byte) => {
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let addr = this.readWordPC();
const oldPage = addr >> 8;
addr = (addr + this.yr) & 0xffff;
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const off = addr & 0xff;
this.readByte(oldPage << 8 | off);
this.writeByte(addr, val);
}
// $00,X
writeZeroPageX = (val: byte) => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
this.writeByte((zpAddr + this.xr) & 0xff, val);
}
// $00,Y
writeZeroPageY = (val: byte) => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
this.writeByte((zpAddr + this.yr) & 0xff, val);
}
// ($00,X)
writeZeroPageXIndirect = (val: byte) => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
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const addr = this.readZPWord((zpAddr + this.xr) & 0xff);
this.writeByte(addr, val);
}
// ($00),Y
writeZeroPageIndirectY = (val: byte) => {
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let addr = this.readZPWord(this.readBytePC());
const oldPage = addr >> 8;
addr = (addr + this.yr) & 0xffff;
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const off = addr & 0xff;
this.readByte(oldPage << 8 | off);
this.writeByte(addr, val);
}
// ($00) (65C02)
writeZeroPageIndirect = (val: byte) => {
this.writeByte(this.readZPWord(this.readBytePC()), val);
}
// $00
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readAddrZeroPage = () => {
return this.readBytePC();
}
// $00,X
readAddrZeroPageX = () => {
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const zpAddr = this.readBytePC();
this.readByte(zpAddr);
return (zpAddr + this.xr) & 0xff;
}
// $0000 (65C02)
readAddrAbsolute = (): word => {
return this.readWordPC();
}
// ($0000) (6502)
readAddrAbsoluteIndirectBug = (): word => {
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const addr = this.readWordPC();
const page = addr & 0xff00;
const off = addr & 0x00ff;
const lsb = this.readByte(addr);
const msb = this.readByte(page | ((off + 0x01) & 0xff));
return msb << 8 | lsb;
}
// ($0000) (65C02)
readAddrAbsoluteIndirect = (): word => {
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const lsb = this.readBytePC();
const msb = this.readBytePC();
this.readByte(this.pc);
return this.readWord(msb << 8 | lsb);
}
// $0000,X
readAddrAbsoluteX = (opts: Opts = {}): word => {
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const addr = this.readWordPC();
if (!this.is65C02 || opts.rwm) {
this.readByte(addr);
} else {
this.readByte(this.pc);
}
return (addr + this.xr) & 0xffff;
}
// $(0000,X) (65C02)
readAddrAbsoluteXIndirect = (): word => {
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const address = this.readWordPC();
this.readByte(this.pc);
return this.readWord((address + this.xr) & 0xffff);
}
/* Break */
brk = (readFn: ReadFn) => {
readFn();
this.pushWord(this.pc);
this.pushByte(this.sr | flags.B);
if (this.is65C02) {
this.setFlag(flags.D, false);
}
this.setFlag(flags.I, true);
this.pc = this.readWord(loc.BRK);
}
/* Load Accumulator */
lda = (readFn: ReadFn) => {
this.ar = this.testNZ(readFn());
}
/* Load X Register */
ldx = (readFn: ReadFn) => {
this.xr = this.testNZ(readFn());
}
/* Load Y Register */
ldy = (readFn: ReadFn) => {
this.yr = this.testNZ(readFn());
}
/* Store Accumulator */
sta = (writeFn: WriteFn) => {
writeFn(this.ar);
}
/* Store X Register */
stx = (writeFn: WriteFn) => {
writeFn(this.xr);
}
/* Store Y Register */
sty = (writeFn: WriteFn) => {
writeFn(this.yr);
}
/* Store Zero */
stz = (writeFn: WriteFn) => {
writeFn(0);
}
/* Add with Carry */
adc = (readFn: ReadFn) => {
this.ar = this.add(this.ar, readFn(), /* sub= */ false);
}
/* Subtract with Carry */
sbc = (readFn: ReadFn) => {
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this.ar = this.add(this.ar, readFn() ^ 0xff, /* sub= */ true);
}
/* Increment Memory */
incA = () => {
this.readByte(this.pc);
this.ar = this.increment(this.ar);
}
inc = (readAddrFn: ReadAddrFn) => {
const addr = readAddrFn({ rwm: true });
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const oldVal = this.readByte(addr);
this.writeByte(addr, oldVal);
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const val = this.increment(oldVal);
this.writeByte(addr, val);
}
/* Increment X */
inx = () => {
this.readByte(this.pc);
this.xr = this.increment(this.xr);
}
/* Increment Y */
iny = () => {
this.readByte(this.pc);
this.yr = this.increment(this.yr);
}
/* Decrement Memory */
decA = () => {
this.readByte(this.pc);
this.ar = this.decrement(this.ar);
}
dec = (readAddrFn: ReadAddrFn) => {
const addr = readAddrFn({ rwm: true });
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const oldVal = this.readByte(addr);
this.writeByte(addr, oldVal);
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const val = this.decrement(oldVal);
this.writeByte(addr, val);
}
/* Decrement X */
dex = () => {
this.readByte(this.pc);
this.xr = this.decrement(this.xr);
}
/* Decrement Y */
dey = () => {
this.readByte(this.pc);
this.yr = this.decrement(this.yr);
}
shiftLeft = (val: byte) => {
this.setFlag(flags.C, !!(val & 0x80));
return this.testNZ((val << 1) & 0xff);
}
/* Arithmetic Shift Left */
aslA = () => {
this.readByte(this.pc);
this.ar = this.shiftLeft(this.ar);
}
asl = (readAddrFn: ReadAddrFn) => {
const addr = readAddrFn({ rwm: true });
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const oldVal = this.readByte(addr);
this.writeByte(addr, oldVal);
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const val = this.shiftLeft(oldVal);
this.writeByte(addr, val);
}
shiftRight = (val: byte) => {
this.setFlag(flags.C, !!(val & 0x01));
return this.testNZ(val >> 1);
}
/* Logical Shift Right */
lsrA = () => {
this.readByte(this.pc);
this.ar = this.shiftRight(this.ar);
}
lsr = (readAddrFn: ReadAddrFn) => {
const addr = readAddrFn({ rwm: true });
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const oldVal = this.readByte(addr);
this.writeByte(addr, oldVal);
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const val = this.shiftRight(oldVal);
this.writeByte(addr, val);
}
rotateLeft = (val: byte) => {
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const c = (this.sr & flags.C);
this.setFlag(flags.C, !!(val & 0x80));
return this.testNZ(((val << 1) | (c ? 0x01 : 0x00)) & 0xff);
}
/* Rotate Left */
rolA = () => {
this.readByte(this.pc);
this.ar = this.rotateLeft(this.ar);
}
rol = (readAddrFn: ReadAddrFn) => {
const addr = readAddrFn({ rwm: true });
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const oldVal = this.readByte(addr);
this.writeByte(addr, oldVal);
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const val = this.rotateLeft(oldVal);
this.writeByte(addr, val);
}
private rotateRight(a: byte) {
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const c = (this.sr & flags.C);
this.setFlag(flags.C, !!(a & 0x01));
return this.testNZ((a >> 1) | (c ? 0x80 : 0x00));
}
/* Rotate Right */
rorA = () => {
this.readByte(this.pc);
this.ar = this.rotateRight(this.ar);
}
ror = (readAddrFn: ReadAddrFn) => {
const addr = readAddrFn({ rwm: true });
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const oldVal = this.readByte(addr);
this.writeByte(addr, oldVal);
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const val = this.rotateRight(oldVal);
this.writeByte(addr, val);
}
/* Logical And Accumulator */
and = (readFn: ReadFn) => {
this.ar = this.testNZ(this.ar & readFn());
}
/* Logical Or Accumulator */
ora = (readFn: ReadFn) => {
this.ar = this.testNZ(this.ar | readFn());
}
/* Logical Exclusive Or Accumulator */
eor = (readFn: ReadFn) => {
this.ar = this.testNZ(this.ar ^ readFn());
}
/* Reset Bit */
rmb = (b: byte) => {
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const bit = (0x1 << b) ^ 0xFF;
const addr = this.readBytePC();
let val = this.readByte(addr);
this.readByte(addr);
val &= bit;
this.writeByte(addr, val);
}
/* Set Bit */
smb = (b: byte) => {
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const bit = 0x1 << b;
const addr = this.readBytePC();
let val = this.readByte(addr);
this.readByte(addr);
val |= bit;
this.writeByte(addr, val);
}
/* Test and Reset Bits */
trb = (readAddrFn: ReadAddrFn) => {
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const addr = readAddrFn();
const val = this.readByte(addr);
this.testZ(val & this.ar);
this.readByte(addr);
this.writeByte(addr, val & ~this.ar);
}
/* Test and Set Bits */
tsb = (readAddrFn: ReadAddrFn) => {
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const addr = readAddrFn();
const val = this.readByte(addr);
this.testZ(val & this.ar);
this.readByte(addr);
this.writeByte(addr, val | this.ar);
}
/* Bit */
bit = (readFn: ReadFn) => {
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const val = readFn();
this.setFlag(flags.Z, (val & this.ar) === 0);
this.setFlag(flags.N, !!(val & 0x80));
this.setFlag(flags.V, !!(val & 0x40));
}
/* Bit Immediate*/
bitI = (readFn: ReadFn) => {
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const val = readFn();
this.setFlag(flags.Z, (val & this.ar) === 0);
}
private compare(a: byte, b: byte) {
b = (b ^ 0xff);
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const c = a + b + 1;
this.setFlag(flags.C, c > 0xff);
this.testNZ(c & 0xff);
}
cmp = (readFn: ReadFn) => {
this.compare(this.ar, readFn());
}
cpx = (readFn: ReadFn) => {
this.compare(this.xr, readFn());
}
cpy = (readFn: ReadFn) => {
this.compare(this.yr, readFn());
}
/* Branches */
brs = (f: flag) => {
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const off = this.readBytePC(); // changes pc
if ((f & this.sr) !== 0) {
this.readByte(this.pc);
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const oldPage = this.pc >> 8;
this.pc += off > 127 ? off - 256 : off;
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this.pc &= 0xffff;
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const newPage = this.pc >> 8;
const newOff = this.pc & 0xff;
if (newPage != oldPage) this.readByte(oldPage << 8 | newOff);
}
}
brc = (f: flag|0) => {
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const off = this.readBytePC(); // changes pc
if ((f & this.sr) === 0) {
this.readByte(this.pc);
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const oldPage = this.pc >> 8;
this.pc += off > 127 ? off - 256 : off;
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this.pc &= 0xffff;
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const newPage = this.pc >> 8;
const newOff = this.pc & 0xff;
if (newPage != oldPage) this.readByte(oldPage << 8 | newOff);
}
}
/* WDC 65C02 branches */
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bbr = (b: byte) => {
const zpAddr = this.readBytePC();
const val = this.readByte(zpAddr);
this.readByte(zpAddr);
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const off = this.readBytePC(); // changes pc
if (((1 << b) & val) === 0) {
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const oldPc = this.pc;
const oldPage = oldPc >> 8;
this.readByte(oldPc);
this.pc += off > 127 ? off - 256 : off;
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this.pc &= 0xffff;
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const newPage = this.pc >> 8;
if (oldPage != newPage) {
this.readByte(oldPc);
}
}
}
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bbs = (b: byte) => {
const zpAddr = this.readBytePC();
const val = this.readByte(zpAddr);
this.readByte(zpAddr);
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const off = this.readBytePC(); // changes pc
if (((1 << b) & val) !== 0) {
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const oldPc = this.pc;
const oldPage = oldPc >> 8;
this.readByte(oldPc);
this.pc += off > 127 ? off - 256 : off;
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this.pc &= 0xffff;
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const newPage = this.pc >> 8;
if (oldPage != newPage) {
this.readByte(oldPc);
}
}
}
/* Transfers and stack */
tax = () => { this.readByte(this.pc); this.testNZ(this.xr = this.ar); }
txa = () => { this.readByte(this.pc); this.testNZ(this.ar = this.xr); }
tay = () => { this.readByte(this.pc); this.testNZ(this.yr = this.ar); }
tya = () => { this.readByte(this.pc); this.testNZ(this.ar = this.yr); }
tsx = () => { this.readByte(this.pc); this.testNZ(this.xr = this.sp); }
txs = () => { this.readByte(this.pc); this.sp = this.xr; }
pha = () => { this.readByte(this.pc); this.pushByte(this.ar); }
pla = () => { this.readByte(this.pc); this.readByte(0x0100 | this.sp); this.testNZ(this.ar = this.pullByte()); }
phx = () => { this.readByte(this.pc); this.pushByte(this.xr); }
plx = () => { this.readByte(this.pc); this.readByte(0x0100 | this.sp); this.testNZ(this.xr = this.pullByte()); }
phy = () => { this.readByte(this.pc); this.pushByte(this.yr); }
ply = () => { this.readByte(this.pc); this.readByte(0x0100 | this.sp); this.testNZ(this.yr = this.pullByte()); }
php = () => { this.readByte(this.pc); this.pushByte(this.sr | flags.B); }
plp = () => { this.readByte(this.pc); this.readByte(0x0100 | this.sp); this.sr = (this.pullByte() & ~flags.B) | 0x20; }
/* Jump */
jmp = (readAddrFn: ReadAddrFn) => {
this.pc = readAddrFn();
}
/* Jump Subroutine */
jsr = () => {
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const lsb = this.readBytePC();
this.readByte(0x0100 | this.sp);
this.pushWord(this.pc);
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const msb = this.readBytePC();
this.pc = (msb << 8 | lsb) & 0xffff;
}
/* Return from Subroutine */
rts = () => {
this.readByte(this.pc);
this.readByte(0x0100 | this.sp);
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const addr = this.pullWordRaw();
this.readByte(addr);
this.pc = (addr + 1) & 0xffff;
}
/* Return from Interrupt */
rti = () => {
this.readByte(this.pc);
this.readByte(0x0100 | this.sp);
this.sr = this.pullByte() & ~flags.B;
this.pc = this.pullWordRaw();
}
/* Set and Clear */
set = (flag: flag) => {
this.readByte(this.pc);
this.sr |= flag;
}
clr = (flag: flag) => {
this.readByte(this.pc);
this.sr &= ~flag;
}
/* No-Op */
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nop = (impliedFn: ImpliedFn) => {
this.readByte(this.pc);
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impliedFn();
}
private unknown(b: byte) {
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let unk: StrictInstruction;
if (this.is65C02) {
unk = {
name: 'NOP',
op: this.nop,
modeFn: this.implied,
mode: 'implied',
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};
} else {
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const cpu = this;
unk = {
name: '???',
op: function (_impliedFn: ImpliedFn) {
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debug('Unknown OpCode: ' + toHex(b) +
' at ' + toHex(cpu.pc - 1, 4));
},
modeFn: this.implied,
mode: 'implied'
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};
}
return unk;
}
public step(cb?: callback) {
this.sync = true;
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const op = this.opary[this.readBytePC()];
this.sync = false;
op.op(op.modeFn);
cb?.(this);
}
public stepN(n: number, cb?: callback) {
for (let idx = 0; idx < n; idx++) {
this.sync = true;
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const op = this.opary[this.readBytePC()];
this.sync = false;
op.op(op.modeFn);
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if (cb?.(this)) {
return;
}
}
}
public stepCycles(c: number) {
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const end = this.cycles + c;
while (this.cycles < end) {
this.sync = true;
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const op = this.opary[this.readBytePC()];
this.sync = false;
op.op(op.modeFn);
}
}
public stepCyclesDebug(c: number, cb?: callback): void {
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const end = this.cycles + c;
while (this.cycles < end) {
this.sync = true;
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const op = this.opary[this.readBytePC()];
this.sync = false;
op.op(op.modeFn);
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if (cb?.(this)) {
return;
}
}
}
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public addPageHandler(pho: (MemoryPages | ResettablePageHandler)) {
for (let idx = pho.start(); idx <= pho.end(); idx++) {
this.memPages[idx] = pho;
}
if (isResettablePageHandler(pho))
this.resetHandlers.push(pho);
}
public reset() {
// cycles = 0;
this.sr = 0x20;
this.sp = 0xff;
this.ar = 0;
this.yr = 0;
this.xr = 0;
this.pc = this.readWord(loc.RESET);
for (let idx = 0; idx < this.resetHandlers.length; idx++) {
this.resetHandlers[idx].reset();
}
}
/* IRQ - Interrupt Request */
public irq() {
if ((this.sr & flags.I) === 0) {
this.pushWord(this.pc);
this.pushByte(this.sr & ~flags.B);
if (this.is65C02) {
this.setFlag(flags.D, false);
}
this.setFlag(flags.I, true);
this.pc = this.readWord(loc.BRK);
}
}
/* NMI Non-maskable Interrupt */
public nmi() {
this.pushWord(this.pc);
this.pushByte(this.sr & ~flags.B);
if (this.is65C02) {
this.setFlag(flags.D, false);
}
this.setFlag(flags.I, true);
this.pc = this.readWord(loc.NMI);
}
public getPC() {
return this.pc;
}
public setPC(pc: word) {
this.pc = pc;
}
public getDebugInfo(): DebugInfo {
const b = this.readByteDebug(this.pc);
const op = this.opary[b];
const size = sizes[op.mode];
const cmd = new Array(size);
cmd[0] = b;
for (let idx = 1; idx < size; idx++) {
cmd[idx] = this.readByteDebug(this.pc + idx);
}
return {
pc: this.pc,
ar: this.ar,
xr: this.xr,
yr: this.yr,
sr: this.sr,
sp: this.sp,
cmd
};
}
public getSync() {
return this.sync;
}
public getCycles() {
return this.cycles;
}
public getOpInfo(opcode: byte) {
return this.opary[opcode];
}
public getState(): CpuState {
return {
a: this.ar,
x: this.xr,
y: this.yr,
s: this.sr,
pc: this.pc,
sp: this.sp,
cycles: this.cycles
};
}
public setState(state: CpuState) {
this.ar = state.a;
this.xr = state.x;
this.yr = state.y;
this.sr = state.s;
this.pc = state.pc;
this.sp = state.sp;
this.cycles = state.cycles;
}
public read(addr: word): byte;
public read(page: byte, off: byte): byte;
public read(a: number, b?: number): byte {
let page, off;
if (b !== undefined) {
page = a;
off = b;
} else {
page = a >> 8;
off = a & 0xff;
}
return this.memPages[page].read(page, off);
}
public write(addr: word, val: byte): void;
public write(page: byte, off: byte, val: byte): void;
public write(a: number, b: number, c?: byte): void {
let page, off, val;
if (c !== undefined ) {
page = a;
off = b;
val = c;
} else {
page = a >> 8;
off = a & 0xff;
val = b;
}
this.memPages[page].write(page, off, val);
}
OPS_6502: Instructions = {
// LDA
0xa9: { name: 'LDA', op: this.lda, modeFn: this.readImmediate, mode: 'immediate' },
0xa5: { name: 'LDA', op: this.lda, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xb5: { name: 'LDA', op: this.lda, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0xad: { name: 'LDA', op: this.lda, modeFn: this.readAbsolute, mode: 'absolute' },
0xbd: { name: 'LDA', op: this.lda, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0xb9: { name: 'LDA', op: this.lda, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0xa1: { name: 'LDA', op: this.lda, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0xb1: { name: 'LDA', op: this.lda, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// LDX
0xa2: { name: 'LDX', op: this.ldx, modeFn: this.readImmediate, mode: 'immediate' },
0xa6: { name: 'LDX', op: this.ldx, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xb6: { name: 'LDX', op: this.ldx, modeFn: this.readZeroPageY, mode: 'zeroPageY' },
0xae: { name: 'LDX', op: this.ldx, modeFn: this.readAbsolute, mode: 'absolute' },
0xbe: { name: 'LDX', op: this.ldx, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
// LDY
0xa0: { name: 'LDY', op: this.ldy, modeFn: this.readImmediate, mode: 'immediate' },
0xa4: { name: 'LDY', op: this.ldy, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xb4: { name: 'LDY', op: this.ldy, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0xac: { name: 'LDY', op: this.ldy, modeFn: this.readAbsolute, mode: 'absolute' },
0xbc: { name: 'LDY', op: this.ldy, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
// STA
0x85: { name: 'STA', op: this.sta, modeFn: this.writeZeroPage, mode: 'zeroPage' },
0x95: { name: 'STA', op: this.sta, modeFn: this.writeZeroPageX, mode: 'zeroPageX' },
0x8d: { name: 'STA', op: this.sta, modeFn: this.writeAbsolute, mode: 'absolute' },
0x9d: { name: 'STA', op: this.sta, modeFn: this.writeAbsoluteX, mode: 'absoluteX' },
0x99: { name: 'STA', op: this.sta, modeFn: this.writeAbsoluteY, mode: 'absoluteY' },
0x81: { name: 'STA', op: this.sta, modeFn: this.writeZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0x91: { name: 'STA', op: this.sta, modeFn: this.writeZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// STX
0x86: { name: 'STX', op: this.stx, modeFn: this.writeZeroPage, mode: 'zeroPage' },
0x96: { name: 'STX', op: this.stx, modeFn: this.writeZeroPageY, mode: 'zeroPageY' },
0x8e: { name: 'STX', op: this.stx, modeFn: this.writeAbsolute, mode: 'absolute' },
// STY
0x84: { name: 'STY', op: this.sty, modeFn: this.writeZeroPage, mode: 'zeroPage' },
0x94: { name: 'STY', op: this.sty, modeFn: this.writeZeroPageX, mode: 'zeroPageX' },
0x8c: { name: 'STY', op: this.sty, modeFn: this.writeAbsolute, mode: 'absolute' },
// ADC
0x69: { name: 'ADC', op: this.adc, modeFn: this.readImmediate, mode: 'immediate' },
0x65: { name: 'ADC', op: this.adc, modeFn: this.readZeroPage, mode: 'zeroPage' },
0x75: { name: 'ADC', op: this.adc, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0x6D: { name: 'ADC', op: this.adc, modeFn: this.readAbsolute, mode: 'absolute' },
0x7D: { name: 'ADC', op: this.adc, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0x79: { name: 'ADC', op: this.adc, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0x61: { name: 'ADC', op: this.adc, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0x71: { name: 'ADC', op: this.adc, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// SBC
0xe9: { name: 'SBC', op: this.sbc, modeFn: this.readImmediate, mode: 'immediate' },
0xe5: { name: 'SBC', op: this.sbc, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xf5: { name: 'SBC', op: this.sbc, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0xeD: { name: 'SBC', op: this.sbc, modeFn: this.readAbsolute, mode: 'absolute' },
0xfD: { name: 'SBC', op: this.sbc, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0xf9: { name: 'SBC', op: this.sbc, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0xe1: { name: 'SBC', op: this.sbc, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0xf1: { name: 'SBC', op: this.sbc, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// INC
0xe6: { name: 'INC', op: this.inc, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0xf6: { name: 'INC', op: this.inc, modeFn: this.readAddrZeroPageX, mode: 'zeroPageX' },
0xee: { name: 'INC', op: this.inc, modeFn: this.readAddrAbsolute, mode: 'absolute' },
0xfe: { name: 'INC', op: this.inc, modeFn: this.readAddrAbsoluteX, mode: 'absoluteX' },
// INX
0xe8: { name: 'INX', op: this.inx, modeFn: this.implied, mode: 'implied' },
// INY
0xc8: { name: 'INY', op: this.iny, modeFn: this.implied, mode: 'implied' },
// DEC
0xc6: { name: 'DEC', op: this.dec, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0xd6: { name: 'DEC', op: this.dec, modeFn: this.readAddrZeroPageX, mode: 'zeroPageX' },
0xce: { name: 'DEC', op: this.dec, modeFn: this.readAddrAbsolute, mode: 'absolute' },
0xde: { name: 'DEC', op: this.dec, modeFn: this.readAddrAbsoluteX, mode: 'absoluteX' },
// DEX
0xca: { name: 'DEX', op: this.dex, modeFn: this.implied, mode: 'implied' },
// DEY
0x88: { name: 'DEY', op: this.dey, modeFn: this.implied, mode: 'implied' },
// ASL
0x0A: { name: 'ASL', op: this.aslA, modeFn: this.implied, mode: 'accumulator' },
0x06: { name: 'ASL', op: this.asl, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0x16: { name: 'ASL', op: this.asl, modeFn: this.readAddrZeroPageX, mode: 'zeroPageX' },
0x0E: { name: 'ASL', op: this.asl, modeFn: this.readAddrAbsolute, mode: 'absolute' },
0x1E: { name: 'ASL', op: this.asl, modeFn: this.readAddrAbsoluteX, mode: 'absoluteX' },
// LSR
0x4A: { name: 'LSR', op: this.lsrA, modeFn: this.implied, mode: 'accumulator' },
0x46: { name: 'LSR', op: this.lsr, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0x56: { name: 'LSR', op: this.lsr, modeFn: this.readAddrZeroPageX, mode: 'zeroPageX' },
0x4E: { name: 'LSR', op: this.lsr, modeFn: this.readAddrAbsolute, mode: 'absolute' },
0x5E: { name: 'LSR', op: this.lsr, modeFn: this.readAddrAbsoluteX, mode: 'absoluteX' },
// ROL
0x2A: { name: 'ROL', op: this.rolA, modeFn: this.implied, mode: 'accumulator' },
0x26: { name: 'ROL', op: this.rol, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0x36: { name: 'ROL', op: this.rol, modeFn: this.readAddrZeroPageX, mode: 'zeroPageX' },
0x2E: { name: 'ROL', op: this.rol, modeFn: this.readAddrAbsolute, mode: 'absolute' },
0x3E: { name: 'ROL', op: this.rol, modeFn: this.readAddrAbsoluteX, mode: 'absoluteX' },
// ROR
0x6A: { name: 'ROR', op: this.rorA, modeFn: this.implied, mode: 'accumulator' },
0x66: { name: 'ROR', op: this.ror, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0x76: { name: 'ROR', op: this.ror, modeFn: this.readAddrZeroPageX, mode: 'zeroPageX' },
0x6E: { name: 'ROR', op: this.ror, modeFn: this.readAddrAbsolute, mode: 'absolute' },
0x7E: { name: 'ROR', op: this.ror, modeFn: this.readAddrAbsoluteX, mode: 'absoluteX' },
// AND
0x29: { name: 'AND', op: this.and, modeFn: this.readImmediate, mode: 'immediate' },
0x25: { name: 'AND', op: this.and, modeFn: this.readZeroPage, mode: 'zeroPage' },
0x35: { name: 'AND', op: this.and, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0x2D: { name: 'AND', op: this.and, modeFn: this.readAbsolute, mode: 'absolute' },
0x3D: { name: 'AND', op: this.and, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0x39: { name: 'AND', op: this.and, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0x21: { name: 'AND', op: this.and, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0x31: { name: 'AND', op: this.and, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// ORA
0x09: { name: 'ORA', op: this.ora, modeFn: this.readImmediate, mode: 'immediate' },
0x05: { name: 'ORA', op: this.ora, modeFn: this.readZeroPage, mode: 'zeroPage' },
0x15: { name: 'ORA', op: this.ora, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0x0D: { name: 'ORA', op: this.ora, modeFn: this.readAbsolute, mode: 'absolute' },
0x1D: { name: 'ORA', op: this.ora, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0x19: { name: 'ORA', op: this.ora, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0x01: { name: 'ORA', op: this.ora, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0x11: { name: 'ORA', op: this.ora, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// EOR
0x49: { name: 'EOR', op: this.eor, modeFn: this.readImmediate, mode: 'immediate' },
0x45: { name: 'EOR', op: this.eor, modeFn: this.readZeroPage, mode: 'zeroPage' },
0x55: { name: 'EOR', op: this.eor, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0x4D: { name: 'EOR', op: this.eor, modeFn: this.readAbsolute, mode: 'absolute' },
0x5D: { name: 'EOR', op: this.eor, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0x59: { name: 'EOR', op: this.eor, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0x41: { name: 'EOR', op: this.eor, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0x51: { name: 'EOR', op: this.eor, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// CMP
0xc9: { name: 'CMP', op: this.cmp, modeFn: this.readImmediate, mode: 'immediate' },
0xc5: { name: 'CMP', op: this.cmp, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xd5: { name: 'CMP', op: this.cmp, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0xcD: { name: 'CMP', op: this.cmp, modeFn: this.readAbsolute, mode: 'absolute' },
0xdD: { name: 'CMP', op: this.cmp, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0xd9: { name: 'CMP', op: this.cmp, modeFn: this.readAbsoluteY, mode: 'absoluteY' },
0xc1: { name: 'CMP', op: this.cmp, modeFn: this.readZeroPageXIndirect, mode: 'zeroPageXIndirect' },
0xd1: { name: 'CMP', op: this.cmp, modeFn: this.readZeroPageIndirectY, mode: 'zeroPageIndirectY' },
// CPX
0xE0: { name: 'CPX', op: this.cpx, modeFn: this.readImmediate, mode: 'immediate' },
0xE4: { name: 'CPX', op: this.cpx, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xEC: { name: 'CPX', op: this.cpx, modeFn: this.readAbsolute, mode: 'absolute' },
// CPY
0xC0: { name: 'CPY', op: this.cpy, modeFn: this.readImmediate, mode: 'immediate' },
0xC4: { name: 'CPY', op: this.cpy, modeFn: this.readZeroPage, mode: 'zeroPage' },
0xCC: { name: 'CPY', op: this.cpy, modeFn: this.readAbsolute, mode: 'absolute' },
// BIT
0x24: { name: 'BIT', op: this.bit, modeFn: this.readZeroPage, mode: 'zeroPage' },
0x2C: { name: 'BIT', op: this.bit, modeFn: this.readAbsolute, mode: 'absolute' },
// BCC
0x90: { name: 'BCC', op: this.brc, modeFn: flags.C, mode: 'relative' },
// BCS
0xB0: { name: 'BCS', op: this.brs, modeFn: flags.C, mode: 'relative' },
// BEQ
0xF0: { name: 'BEQ', op: this.brs, modeFn: flags.Z, mode: 'relative' },
// BMI
0x30: { name: 'BMI', op: this.brs, modeFn: flags.N, mode: 'relative' },
// BNE
0xD0: { name: 'BNE', op: this.brc, modeFn: flags.Z, mode: 'relative' },
// BPL
0x10: { name: 'BPL', op: this.brc, modeFn: flags.N, mode: 'relative' },
// BVC
0x50: { name: 'BVC', op: this.brc, modeFn: flags.V, mode: 'relative' },
// BVS
0x70: { name: 'BVS', op: this.brs, modeFn: flags.V, mode: 'relative' },
// TAX
0xAA: { name: 'TAX', op: this.tax, modeFn: this.implied, mode: 'implied' },
// TXA
0x8A: { name: 'TXA', op: this.txa, modeFn: this.implied, mode: 'implied' },
// TAY
0xA8: { name: 'TAY', op: this.tay, modeFn: this.implied, mode: 'implied' },
// TYA
0x98: { name: 'TYA', op: this.tya, modeFn: this.implied, mode: 'implied' },
// TSX
0xBA: { name: 'TSX', op: this.tsx, modeFn: this.implied, mode: 'implied' },
// TXS
0x9A: { name: 'TXS', op: this.txs, modeFn: this.implied, mode: 'implied' },
// PHA
0x48: { name: 'PHA', op: this.pha, modeFn: this.implied, mode: 'implied' },
// PLA
0x68: { name: 'PLA', op: this.pla, modeFn: this.implied, mode: 'implied' },
// PHP
0x08: { name: 'PHP', op: this.php, modeFn: this.implied, mode: 'implied' },
// PLP
0x28: { name: 'PLP', op: this.plp, modeFn: this.implied, mode: 'implied' },
// JMP
0x4C: {
name: 'JMP', op: this.jmp, modeFn: this.readAddrAbsolute, mode: 'absolute'
},
0x6C: {
name: 'JMP', op: this.jmp, modeFn: this.readAddrAbsoluteIndirectBug, mode: 'absoluteIndirect'
},
// JSR
0x20: { name: 'JSR', op: this.jsr, modeFn: this.readAddrAbsolute, mode: 'absolute' },
// RTS
0x60: { name: 'RTS', op: this.rts, modeFn: this.implied, mode: 'implied' },
// RTI
0x40: { name: 'RTI', op: this.rti, modeFn: this.implied, mode: 'implied' },
// SEC
0x38: { name: 'SEC', op: this.set, modeFn: flags.C, mode: 'implied' },
// SED
0xF8: { name: 'SED', op: this.set, modeFn: flags.D, mode: 'implied' },
// SEI
0x78: { name: 'SEI', op: this.set, modeFn: flags.I, mode: 'implied' },
// CLC
0x18: { name: 'CLC', op: this.clr, modeFn: flags.C, mode: 'implied' },
// CLD
0xD8: { name: 'CLD', op: this.clr, modeFn: flags.D, mode: 'implied' },
// CLI
0x58: { name: 'CLI', op: this.clr, modeFn: flags.I, mode: 'implied' },
// CLV
0xB8: { name: 'CLV', op: this.clr, modeFn: flags.V, mode: 'implied' },
// NOP
0xea: { name: 'NOP', op: this.nop, modeFn: this.implied, mode: 'implied' },
// BRK
0x00: { name: 'BRK', op: this.brk, modeFn: this.readImmediate, mode: 'immediate' }
};
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/* 65C02 Instructions */
OPS_65C02: Instructions = {
// INC / DEC A
0x1A: { name: 'INC', op: this.incA, modeFn: this.implied, mode: 'accumulator' },
0x3A: { name: 'DEC', op: this.decA, modeFn: this.implied, mode: 'accumulator' },
// Indirect Zero Page for the masses
0x12: { name: 'ORA', op: this.ora, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
0x32: { name: 'AND', op: this.and, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
0x52: { name: 'EOR', op: this.eor, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
0x72: { name: 'ADC', op: this.adc, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
0x92: { name: 'STA', op: this.sta, modeFn: this.writeZeroPageIndirect, mode: 'zeroPageIndirect' },
0xB2: { name: 'LDA', op: this.lda, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
0xD2: { name: 'CMP', op: this.cmp, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
0xF2: { name: 'SBC', op: this.sbc, modeFn: this.readZeroPageIndirect, mode: 'zeroPageIndirect' },
// Better BIT
0x34: { name: 'BIT', op: this.bit, modeFn: this.readZeroPageX, mode: 'zeroPageX' },
0x3C: { name: 'BIT', op: this.bit, modeFn: this.readAbsoluteX, mode: 'absoluteX' },
0x89: { name: 'BIT', op: this.bitI, modeFn: this.readImmediate, mode: 'immediate' },
// JMP absolute indirect indexed
0x6C: {
name: 'JMP', op: this.jmp, modeFn: this.readAddrAbsoluteIndirect, mode: 'absoluteIndirect'
},
0x7C: {
name: 'JMP', op: this.jmp, modeFn: this.readAddrAbsoluteXIndirect, mode: 'absoluteXIndirect'
},
// BBR/BBS
0x0F: { name: 'BBR0', op: this.bbr, modeFn: 0, mode: 'zeroPage_relative' },
0x1F: { name: 'BBR1', op: this.bbr, modeFn: 1, mode: 'zeroPage_relative' },
0x2F: { name: 'BBR2', op: this.bbr, modeFn: 2, mode: 'zeroPage_relative' },
0x3F: { name: 'BBR3', op: this.bbr, modeFn: 3, mode: 'zeroPage_relative' },
0x4F: { name: 'BBR4', op: this.bbr, modeFn: 4, mode: 'zeroPage_relative' },
0x5F: { name: 'BBR5', op: this.bbr, modeFn: 5, mode: 'zeroPage_relative' },
0x6F: { name: 'BBR6', op: this.bbr, modeFn: 6, mode: 'zeroPage_relative' },
0x7F: { name: 'BBR7', op: this.bbr, modeFn: 7, mode: 'zeroPage_relative' },
0x8F: { name: 'BBS0', op: this.bbs, modeFn: 0, mode: 'zeroPage_relative' },
0x9F: { name: 'BBS1', op: this.bbs, modeFn: 1, mode: 'zeroPage_relative' },
0xAF: { name: 'BBS2', op: this.bbs, modeFn: 2, mode: 'zeroPage_relative' },
0xBF: { name: 'BBS3', op: this.bbs, modeFn: 3, mode: 'zeroPage_relative' },
0xCF: { name: 'BBS4', op: this.bbs, modeFn: 4, mode: 'zeroPage_relative' },
0xDF: { name: 'BBS5', op: this.bbs, modeFn: 5, mode: 'zeroPage_relative' },
0xEF: { name: 'BBS6', op: this.bbs, modeFn: 6, mode: 'zeroPage_relative' },
0xFF: { name: 'BBS7', op: this.bbs, modeFn: 7, mode: 'zeroPage_relative' },
// BRA
0x80: { name: 'BRA', op: this.brc, modeFn: 0, mode: 'relative' },
// NOP
0x02: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x22: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x42: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x44: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x54: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x62: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x82: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0xC2: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0xD4: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0xE2: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0xF4: { name: 'NOP', op: this.nop, modeFn: this.readImmediate, mode: 'immediate' },
0x5C: { name: 'NOP', op: this.nop, modeFn: this.readAbsolute, mode: 'absolute' },
0xDC: { name: 'NOP', op: this.nop, modeFn: this.readAbsolute, mode: 'absolute' },
0xFC: { name: 'NOP', op: this.nop, modeFn: this.readAbsolute, mode: 'absolute' },
// PHX
0xDA: { name: 'PHX', op: this.phx, modeFn: this.implied, mode: 'implied' },
// PHY
0x5A: { name: 'PHY', op: this.phy, modeFn: this.implied, mode: 'implied' },
// PLX
0xFA: { name: 'PLX', op: this.plx, modeFn: this.implied, mode: 'implied' },
// PLY
0x7A: { name: 'PLY', op: this.ply, modeFn: this.implied, mode: 'implied' },
// RMB/SMB
0x07: { name: 'RMB0', op: this.rmb, modeFn: 0, mode: 'zeroPage' },
0x17: { name: 'RMB1', op: this.rmb, modeFn: 1, mode: 'zeroPage' },
0x27: { name: 'RMB2', op: this.rmb, modeFn: 2, mode: 'zeroPage' },
0x37: { name: 'RMB3', op: this.rmb, modeFn: 3, mode: 'zeroPage' },
0x47: { name: 'RMB4', op: this.rmb, modeFn: 4, mode: 'zeroPage' },
0x57: { name: 'RMB5', op: this.rmb, modeFn: 5, mode: 'zeroPage' },
0x67: { name: 'RMB6', op: this.rmb, modeFn: 6, mode: 'zeroPage' },
0x77: { name: 'RMB7', op: this.rmb, modeFn: 7, mode: 'zeroPage' },
0x87: { name: 'SMB0', op: this.smb, modeFn: 0, mode: 'zeroPage' },
0x97: { name: 'SMB1', op: this.smb, modeFn: 1, mode: 'zeroPage' },
0xA7: { name: 'SMB2', op: this.smb, modeFn: 2, mode: 'zeroPage' },
0xB7: { name: 'SMB3', op: this.smb, modeFn: 3, mode: 'zeroPage' },
0xC7: { name: 'SMB4', op: this.smb, modeFn: 4, mode: 'zeroPage' },
0xD7: { name: 'SMB5', op: this.smb, modeFn: 5, mode: 'zeroPage' },
0xE7: { name: 'SMB6', op: this.smb, modeFn: 6, mode: 'zeroPage' },
0xF7: { name: 'SMB7', op: this.smb, modeFn: 7, mode: 'zeroPage' },
// STZ
0x64: { name: 'STZ', op: this.stz, modeFn: this.writeZeroPage, mode: 'zeroPage' },
0x74: { name: 'STZ', op: this.stz, modeFn: this.writeZeroPageX, mode: 'zeroPageX' },
0x9C: { name: 'STZ', op: this.stz, modeFn: this.writeAbsolute, mode: 'absolute' },
0x9E: { name: 'STZ', op: this.stz, modeFn: this.writeAbsoluteX, mode: 'absoluteX' },
// TRB
0x14: { name: 'TRB', op: this.trb, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0x1C: { name: 'TRB', op: this.trb, modeFn: this.readAddrAbsolute, mode: 'absolute' },
// TSB
0x04: { name: 'TSB', op: this.tsb, modeFn: this.readAddrZeroPage, mode: 'zeroPage' },
0x0C: { name: 'TSB', op: this.tsb, modeFn: this.readAddrAbsolute, mode: 'absolute' }
}
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}