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Cpu.js
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import {Register8bit, Register16bit} from './Register.js';
import {Memory} from './Memory.js';
import {Utility} from './Utility.js';
/**
* Ricoh 6502
* Refer to https://wiki.nesdev.com/w/index.php/CPU
*/
function Cpu() {
// registers
this.pc = new Register16bit();
this.sp = new Register8bit();
this.a = new Register8bit();
this.x = new Register8bit();
this.y = new Register8bit();
this.p = new CpuStatusRegister();
// CPU inside RAM
this.ram = new Memory(64 * 1024); // 64KB
// other devices
this.ppu = null; // set by setPpu()
this.apu = null; // set by setApu()
this.pad1 = null; // set by setJoypad1()
this.pad2 = null; // set by setJoypad2()
// cartridge ROM
this.rom = null; // set by setRom()
// Executing an instruction takes 1, 2, or more cycles.
// .stallCycle represents the number of cycles left to
// complete the currently executed instruction.
this.stallCycle = 0;
}
// Interrups
Cpu.INTERRUPTS = {
NMI: 0,
RESET: 1,
IRQ: 2,
BRK: 3 // not interrupt but instruction
};
Cpu.INTERRUPT_HANDLER_ADDRESSES = [];
Cpu.INTERRUPT_HANDLER_ADDRESSES[Cpu.INTERRUPTS.NMI] = 0xFFFA;
Cpu.INTERRUPT_HANDLER_ADDRESSES[Cpu.INTERRUPTS.RESET] = 0xFFFC;
Cpu.INTERRUPT_HANDLER_ADDRESSES[Cpu.INTERRUPTS.IRQ] = 0xFFFE;
Cpu.INTERRUPT_HANDLER_ADDRESSES[Cpu.INTERRUPTS.BRK] = 0xFFFE;
// Instructions
Cpu.INSTRUCTIONS = {
INV: {'id': 0, 'name': 'inv'}, // Invalid
ADC: {'id': 1, 'name': 'adc'},
AND: {'id': 2, 'name': 'and'},
ASL: {'id': 3, 'name': 'asl'},
BCC: {'id': 4, 'name': 'bcc'},
BCS: {'id': 5, 'name': 'bcs'},
BEQ: {'id': 6, 'name': 'beq'},
BIT: {'id': 7, 'name': 'bit'},
BMI: {'id': 8, 'name': 'bmi'},
BNE: {'id': 9, 'name': 'bne'},
BPL: {'id': 10, 'name': 'bpl'},
BRK: {'id': 11, 'name': 'brk'},
BVC: {'id': 12, 'name': 'bvc'},
BVS: {'id': 13, 'name': 'bvs'},
CLC: {'id': 14, 'name': 'clc'},
CLD: {'id': 15, 'name': 'cld'},
CLI: {'id': 16, 'name': 'cli'},
CLV: {'id': 17, 'name': 'clv'},
CMP: {'id': 18, 'name': 'cmp'},
CPX: {'id': 19, 'name': 'cpx'},
CPY: {'id': 20, 'name': 'cpy'},
DEC: {'id': 21, 'name': 'dec'},
DEX: {'id': 22, 'name': 'dex'},
DEY: {'id': 23, 'name': 'dey'},
EOR: {'id': 24, 'name': 'eor'},
INC: {'id': 25, 'name': 'inc'},
INX: {'id': 26, 'name': 'inx'},
INY: {'id': 27, 'name': 'iny'},
JMP: {'id': 28, 'name': 'jmp'},
JSR: {'id': 29, 'name': 'jsr'},
LDA: {'id': 30, 'name': 'lda'},
LDX: {'id': 31, 'name': 'ldx'},
LDY: {'id': 32, 'name': 'ldy'},
LSR: {'id': 33, 'name': 'lsr'},
NOP: {'id': 34, 'name': 'nop'},
ORA: {'id': 35, 'name': 'ora'},
PHA: {'id': 36, 'name': 'pha'},
PHP: {'id': 37, 'name': 'php'},
PLA: {'id': 38, 'name': 'pla'},
PLP: {'id': 39, 'name': 'plp'},
ROL: {'id': 40, 'name': 'rol'},
ROR: {'id': 41, 'name': 'ror'},
RTI: {'id': 42, 'name': 'rti'},
RTS: {'id': 43, 'name': 'rts'},
SBC: {'id': 44, 'name': 'sbc'},
SEC: {'id': 45, 'name': 'sec'},
SED: {'id': 46, 'name': 'sed'},
SEI: {'id': 47, 'name': 'sei'},
STA: {'id': 48, 'name': 'sta'},
STX: {'id': 49, 'name': 'stx'},
STY: {'id': 50, 'name': 'sty'},
TAX: {'id': 51, 'name': 'tax'},
TAY: {'id': 52, 'name': 'tay'},
TSX: {'id': 53, 'name': 'tsx'},
TXA: {'id': 54, 'name': 'txa'},
TXS: {'id': 55, 'name': 'txs'},
TYA: {'id': 56, 'name': 'tya'}
};
// Addressing modes
Cpu.ADDRESSINGS = {
IMMEDIATE: {'id': 0, 'pc': 2, 'name': 'immediate'},
ABSOLUTE: {'id': 1, 'pc': 3, 'name': 'absolute'},
INDEXED_ABSOLUTE_X: {'id': 2, 'pc': 3, 'name': 'indexed_absolute_x'},
INDEXED_ABSOLUTE_Y: {'id': 3, 'pc': 3, 'name': 'indexed_absolute_y'},
ZERO_PAGE: {'id': 4, 'pc': 2, 'name': 'zero_page'},
INDEXED_ZERO_PAGE_X: {'id': 5, 'pc': 2, 'name': 'indexed_zero_page_x'},
INDEXED_ZERO_PAGE_Y: {'id': 6, 'pc': 2, 'name': 'indexed_zero_page_y'},
IMPLIED: {'id': 7, 'pc': 1, 'name': 'implied'},
ACCUMULATOR: {'id': 8, 'pc': 1, 'name': 'accumulator'},
INDIRECT: {'id': 9, 'pc': 3, 'name': 'indirect'},
INDEXED_INDIRECT_X: {'id': 10, 'pc': 2, 'name': 'indexed_indirect_x'},
INDEXED_INDIRECT_Y: {'id': 11, 'pc': 2, 'name': 'indexed_indirect_y'},
RELATIVE: {'id': 12, 'pc': 2, 'name': 'relative'}
};
// Operations (the combinations of interuction and addressing mode)
// Decoding in advance because it's much easier than implementing decoder.
Cpu.OPS = [
/* 0x00 */ {'instruction': Cpu.INSTRUCTIONS.BRK, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x01 */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0x02 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x03 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x04 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x05 */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x06 */ {'instruction': Cpu.INSTRUCTIONS.ASL, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x07 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x08 */ {'instruction': Cpu.INSTRUCTIONS.PHP, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x09 */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0x0A */ {'instruction': Cpu.INSTRUCTIONS.ASL, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.ACCUMULATOR},
/* 0x0B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x0C */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x0D */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x0E */ {'instruction': Cpu.INSTRUCTIONS.ASL, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x0F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x10 */ {'instruction': Cpu.INSTRUCTIONS.BPL, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0x11 */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0x12 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x13 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x14 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x15 */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x16 */ {'instruction': Cpu.INSTRUCTIONS.ASL, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x17 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x18 */ {'instruction': Cpu.INSTRUCTIONS.CLC, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x19 */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0x1A */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x1B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x1C */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x1D */ {'instruction': Cpu.INSTRUCTIONS.ORA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x1E */ {'instruction': Cpu.INSTRUCTIONS.ASL, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x1F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x20 */ {'instruction': Cpu.INSTRUCTIONS.JSR, 'cycle': 0, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x21 */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0x22 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x23 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x24 */ {'instruction': Cpu.INSTRUCTIONS.BIT, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x25 */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x26 */ {'instruction': Cpu.INSTRUCTIONS.ROL, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x27 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x28 */ {'instruction': Cpu.INSTRUCTIONS.PLP, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x29 */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0x2A */ {'instruction': Cpu.INSTRUCTIONS.ROL, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.ACCUMULATOR},
/* 0x2B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x2C */ {'instruction': Cpu.INSTRUCTIONS.BIT, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x2D */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x2E */ {'instruction': Cpu.INSTRUCTIONS.ROL, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x2F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x30 */ {'instruction': Cpu.INSTRUCTIONS.BMI, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0x31 */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0x32 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x33 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x34 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x35 */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x36 */ {'instruction': Cpu.INSTRUCTIONS.ROL, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x37 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x38 */ {'instruction': Cpu.INSTRUCTIONS.SEC, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x39 */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0x3A */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x3B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x3C */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x3D */ {'instruction': Cpu.INSTRUCTIONS.AND, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x3E */ {'instruction': Cpu.INSTRUCTIONS.ROL, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x3F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x40 */ {'instruction': Cpu.INSTRUCTIONS.RTI, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x41 */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0x42 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x43 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x44 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x45 */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x46 */ {'instruction': Cpu.INSTRUCTIONS.LSR, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x47 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x48 */ {'instruction': Cpu.INSTRUCTIONS.PHA, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x49 */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0x4A */ {'instruction': Cpu.INSTRUCTIONS.LSR, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.ACCUMULATOR},
/* 0x4B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x4C */ {'instruction': Cpu.INSTRUCTIONS.JMP, 'cycle': 0, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x4D */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x4E */ {'instruction': Cpu.INSTRUCTIONS.LSR, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x4F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x50 */ {'instruction': Cpu.INSTRUCTIONS.BVC, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0x51 */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0x52 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x53 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x54 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x55 */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x56 */ {'instruction': Cpu.INSTRUCTIONS.LSR, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x57 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x58 */ {'instruction': Cpu.INSTRUCTIONS.CLI, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x59 */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0x5A */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x5B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x5C */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x5D */ {'instruction': Cpu.INSTRUCTIONS.EOR, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x5E */ {'instruction': Cpu.INSTRUCTIONS.LSR, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x5F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x60 */ {'instruction': Cpu.INSTRUCTIONS.RTS, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x61 */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0x62 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x63 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x64 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x65 */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x66 */ {'instruction': Cpu.INSTRUCTIONS.ROR, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x67 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x68 */ {'instruction': Cpu.INSTRUCTIONS.PLA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x69 */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0x6A */ {'instruction': Cpu.INSTRUCTIONS.ROR, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.ACCUMULATOR},
/* 0x6B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x6C */ {'instruction': Cpu.INSTRUCTIONS.JMP, 'cycle': 0, 'mode': Cpu.ADDRESSINGS.INDIRECT},
/* 0x6D */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x6E */ {'instruction': Cpu.INSTRUCTIONS.ROR, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x6F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x70 */ {'instruction': Cpu.INSTRUCTIONS.BVS, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0x71 */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0x72 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x73 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x74 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x75 */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x76 */ {'instruction': Cpu.INSTRUCTIONS.ROR, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x77 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x78 */ {'instruction': Cpu.INSTRUCTIONS.SEI, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x79 */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0x7A */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x7B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x7C */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x7D */ {'instruction': Cpu.INSTRUCTIONS.ADC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x7E */ {'instruction': Cpu.INSTRUCTIONS.ROR, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x7F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x80 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x81 */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0x82 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x83 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x84 */ {'instruction': Cpu.INSTRUCTIONS.STY, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x85 */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x86 */ {'instruction': Cpu.INSTRUCTIONS.STX, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0x87 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x88 */ {'instruction': Cpu.INSTRUCTIONS.DEY, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x89 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x8A */ {'instruction': Cpu.INSTRUCTIONS.TXA, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x8B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x8C */ {'instruction': Cpu.INSTRUCTIONS.STY, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x8D */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x8E */ {'instruction': Cpu.INSTRUCTIONS.STX, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0x8F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x90 */ {'instruction': Cpu.INSTRUCTIONS.BCC, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0x91 */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0x92 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x93 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x94 */ {'instruction': Cpu.INSTRUCTIONS.STY, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x95 */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0x96 */ {'instruction': Cpu.INSTRUCTIONS.STX, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_Y},
/* 0x97 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x98 */ {'instruction': Cpu.INSTRUCTIONS.TYA, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x99 */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0x9A */ {'instruction': Cpu.INSTRUCTIONS.TXS, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0x9B */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x9C */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x9D */ {'instruction': Cpu.INSTRUCTIONS.STA, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0x9E */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0x9F */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xA0 */ {'instruction': Cpu.INSTRUCTIONS.LDY, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xA1 */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0xA2 */ {'instruction': Cpu.INSTRUCTIONS.LDX, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xA3 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xA4 */ {'instruction': Cpu.INSTRUCTIONS.LDY, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xA5 */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xA6 */ {'instruction': Cpu.INSTRUCTIONS.LDX, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xA7 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xA8 */ {'instruction': Cpu.INSTRUCTIONS.TAY, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xA9 */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xAA */ {'instruction': Cpu.INSTRUCTIONS.TAX, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xAB */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xAC */ {'instruction': Cpu.INSTRUCTIONS.LDY, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xAD */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xAE */ {'instruction': Cpu.INSTRUCTIONS.LDX, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xAF */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xB0 */ {'instruction': Cpu.INSTRUCTIONS.BCS, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0xB1 */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0xB2 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xB3 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xB4 */ {'instruction': Cpu.INSTRUCTIONS.LDY, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0xB5 */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0xB6 */ {'instruction': Cpu.INSTRUCTIONS.LDX, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_Y},
/* 0xB7 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xB8 */ {'instruction': Cpu.INSTRUCTIONS.CLV, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xB9 */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0xBA */ {'instruction': Cpu.INSTRUCTIONS.TSX, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xBB */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xBC */ {'instruction': Cpu.INSTRUCTIONS.LDY, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0xBD */ {'instruction': Cpu.INSTRUCTIONS.LDA, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0xBE */ {'instruction': Cpu.INSTRUCTIONS.LDX, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0xBF */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xC0 */ {'instruction': Cpu.INSTRUCTIONS.CPY, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xC1 */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0xC2 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xC3 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xC4 */ {'instruction': Cpu.INSTRUCTIONS.CPY, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xC5 */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xC6 */ {'instruction': Cpu.INSTRUCTIONS.DEC, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xC7 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xC8 */ {'instruction': Cpu.INSTRUCTIONS.INY, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xC9 */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xCA */ {'instruction': Cpu.INSTRUCTIONS.DEX, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xCB */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xCC */ {'instruction': Cpu.INSTRUCTIONS.CPY, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xCD */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xCE */ {'instruction': Cpu.INSTRUCTIONS.DEC, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xCF */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xD0 */ {'instruction': Cpu.INSTRUCTIONS.BNE, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0xD1 */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0xD2 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xD3 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xD4 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xD5 */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0xD6 */ {'instruction': Cpu.INSTRUCTIONS.DEC, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0xD7 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xD8 */ {'instruction': Cpu.INSTRUCTIONS.CLD, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xD9 */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0xDA */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xDB */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xDC */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xDD */ {'instruction': Cpu.INSTRUCTIONS.CMP, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0xDE */ {'instruction': Cpu.INSTRUCTIONS.DEC, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0xDF */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xE0 */ {'instruction': Cpu.INSTRUCTIONS.CPX, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xE1 */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_X},
/* 0xE2 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xE3 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xE4 */ {'instruction': Cpu.INSTRUCTIONS.CPX, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xE5 */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 3, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xE6 */ {'instruction': Cpu.INSTRUCTIONS.INC, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.ZERO_PAGE},
/* 0xE7 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xE8 */ {'instruction': Cpu.INSTRUCTIONS.INX, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xE9 */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMMEDIATE},
/* 0xEA */ {'instruction': Cpu.INSTRUCTIONS.NOP, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xEB */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xEC */ {'instruction': Cpu.INSTRUCTIONS.CPX, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xED */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xEE */ {'instruction': Cpu.INSTRUCTIONS.INC, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.ABSOLUTE},
/* 0xEF */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xF0 */ {'instruction': Cpu.INSTRUCTIONS.BEQ, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.RELATIVE},
/* 0xF1 */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 5, 'mode': Cpu.ADDRESSINGS.INDEXED_INDIRECT_Y},
/* 0xF2 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xF3 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xF4 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xF5 */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0xF6 */ {'instruction': Cpu.INSTRUCTIONS.INC, 'cycle': 6, 'mode': Cpu.ADDRESSINGS.INDEXED_ZERO_PAGE_X},
/* 0xF7 */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xF8 */ {'instruction': Cpu.INSTRUCTIONS.SED, 'cycle': 2, 'mode': Cpu.ADDRESSINGS.IMPLIED},
/* 0xF9 */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_Y},
/* 0xFA */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xFB */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xFC */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null},
/* 0xFD */ {'instruction': Cpu.INSTRUCTIONS.SBC, 'cycle': 4, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0xFE */ {'instruction': Cpu.INSTRUCTIONS.INC, 'cycle': 7, 'mode': Cpu.ADDRESSINGS.INDEXED_ABSOLUTE_X},
/* 0xFF */ {'instruction': Cpu.INSTRUCTIONS.INV, 'cycle': 0, 'mode': null}
];
Object.assign(Cpu.prototype, {
isCpu: true,
//
INTERRUPTS: Cpu.INTERRUPTS,
INTERRUPT_HANDLER_ADDRESSES: Cpu.INTERRUPT_HANDLER_ADDRESSES,
ADDRESSINGS: Cpu.ADDRESSINGS,
INSTRUCTIONS: Cpu.INSTRUCTIONS,
OPS: Cpu.OPS,
// public methods
// set methods
/**
*
*/
setPpu: function(ppu) {
this.ppu = ppu;
},
/**
*
*/
setApu: function(apu) {
this.apu = apu;
},
/**
*
*/
setJoypad1: function(pad1) {
this.pad1 = pad1;
},
/**
*
*/
setJoypad2: function(pad2) {
this.pad2 = pad2;
},
/**
*
*/
setRom: function(rom) {
this.rom = rom;
},
//
/**
* Refer to https://wiki.nesdev.com/w/index.php/CPU_power_up_state
*/
bootup: function() {
this.p.store(0x34);
this.a.clear();
this.x.clear();
this.y.clear();
this.sp.store(0xFD);
for(var i = 0; i < 0xF; i++)
this.store(0x4000 + i, 0);
this.store(0x4015, 0);
this.store(0x4017, 0);
this.interrupt(this.INTERRUPTS.RESET);
},
/**
* Refer to https://wiki.nesdev.com/w/index.php/CPU_power_up_state
*/
reset: function() {
this.sp.sub(3);
this.p.setI();
this.interrupt(this.INTERRUPTS.RESET);
},
/**
*
*/
runCycle: function() {
if(this.isStall() !== true) {
var opc = this.fetch();
var op = this.decode(opc);
this.operate(op, opc);
this.stallCycle = op.cycle;
}
this.stallCycle--;
},
/**
*
*/
isStall: function() {
return this.stallCycle > 0;
},
/**
*
*/
interrupt: function(type) {
if(type === this.INTERRUPTS.IRQ && this.p.isI() === true)
return;
if(type !== this.INTERRUPTS.RESET) {
if(type !== this.INTERRUPTS.BRK)
this.p.clearB();
this.p.setA();
this.pushStack2Bytes(this.pc.load());
this.pushStack(this.p.load());
this.p.setI();
}
this.jumpToInterruptHandler(type);
},
// load/store methods
/**
*
*/
load: function(address) {
address = address & 0xFFFF; // just in case
// 0x0000 - 0x07FF: 2KB internal RAM
// 0x0800 - 0x1FFF: Mirrors of 0x0000 - 0x07FF (repeats every 0x800 bytes)
if(address >= 0 && address < 0x2000)
return this.ram.load(address & 0x07FF);
// 0x2000 - 0x2007: PPU registers
// 0x2008 - 0x3FFF: Mirrors of 0x2000 - 0x2007 (repeats every 8 bytes)
if(address >= 0x2000 && address < 0x4000)
return this.ppu.loadRegister(address & 0x2007);
// 0x4000 - 0x4017: APU, PPU and I/O registers
// 0x4018 - 0x401F: APU and I/O functionality that is normally disabled
if(address >= 0x4000 && address < 0x4014)
return this.apu.loadRegister(address);
if(address === 0x4014)
return this.ppu.loadRegister(address);
if(address === 0x4015)
return this.apu.loadRegister(address);
if(address === 0x4016)
return this.pad1.loadRegister();
if(address >= 0x4017 && address < 0x4020)
return this.apu.loadRegister(address);
// cartridge space
if(address >= 0x4020 && address < 0x6000)
return this.ram.load(address);
// 0x6000 - 0x7FFF: Battery Backed Save or Work RAM
if(address >= 0x6000 && address < 0x8000)
return this.ram.load(address);
// 0x8000 - 0xFFFF: ROM
if(address >= 0x8000 && address < 0x10000)
return this.rom.load(address);
},
/**
*
*/
store: function(address, value) {
address = address & 0xFFFF; // just in case
// 0x0000 - 0x07FF: 2KB internal RAM
// 0x0800 - 0x1FFF: Mirrors of 0x0000 - 0x07FF (repeats every 0x800 bytes)
if(address >= 0 && address < 0x2000)
return this.ram.store(address & 0x07FF, value);
// 0x2000 - 0x2007: PPU registers
// 0x2008 - 0x3FFF: Mirrors of 0x2000 - 0x2007 (repeats every 8 bytes)
if(address >= 0x2000 && address < 0x4000)
return this.ppu.storeRegister(address & 0x2007, value);
// 0x4000 - 0x4017: APU, PPU and I/O registers
// 0x4018 - 0x401F: APU and I/O functionality that is normally disabled
if(address >= 0x4000 && address < 0x4014)
return this.apu.storeRegister(address, value);
if(address === 0x4014)
return this.ppu.storeRegister(address, value);
if(address === 0x4015)
return this.apu.storeRegister(address, value);
if(address === 0x4016)
return this.pad1.storeRegister(value);
if(address >= 0x4017 && address < 0x4020)
return this.apu.storeRegister(address, value);
// cartridge space
if(address >= 0x4020 && address < 0x6000)
return this.ram.store(address, value);
// 0x6000 - 0x7FFF: Battery Backed Save or Work RAM
if(address >= 0x6000 && address < 0x8000)
return this.ram.store(address, value);
// 0x8000 - 0xFFFF: ROM
if(address >= 0x8000 && address < 0x10000)
return this.rom.store(address, value);
},
// private methods
// load/store methods
/**
*
*/
load2Bytes: function(address) {
return this.load(address) | (this.load(address + 1) << 8);
},
/**
*
*/
load2BytesFromZeropage: function(address) {
return this.ram.load(address & 0xff) | (this.ram.load((address + 1) & 0xff) << 8);
},
/**
*
*/
load2BytesInPage: function(address) {
var addr1 = address;
var addr2 = (address & 0xff00) | ((address + 1) & 0xff);
return this.load(addr1) | (this.load(addr2) << 8);
},
/**
*
*/
store2Bytes: function(address, value) {
this.store(address, value);
this.store(address + 1, value >> 8);
},
// processing methods
/**
*
*/
fetch: function() {
var opc = this.load(this.pc.load());
this.pc.increment();
return opc;
},
/**
*
*/
decode: function(opc) {
return this.OPS[opc];
},
/**
*
*/
jumpToInterruptHandler: function(type) {
this.pc.store(this.load2Bytes(this.INTERRUPT_HANDLER_ADDRESSES[type]));
},
//
/**
*
*/
loadWithAddressingMode: function(op) {
if(op.mode.id === this.ADDRESSINGS.ACCUMULATOR.id)
return this.a.load();
var address = this.getAddressWithAddressingMode(op);
var value = this.load(address);
// expects that relative addressing mode is used only for load.
if(op.mode.id === this.ADDRESSINGS.RELATIVE.id) {
// TODO: confirm if this logic is right.
if(value & 0x80)
value = value | 0xff00;
}
return value;
},
storeWithAddressingMode: function(op, value) {
if(op.mode.id === this.ADDRESSINGS.ACCUMULATOR.id) {
this.a.store(value);
return;
}
var address = this.getAddressWithAddressingMode(op);
this.store(address, value);
},
updateMemoryWithAddressingMode: function(op, func) {
var address;
var src;
if(op.mode.id == this.ADDRESSINGS.ACCUMULATOR.id) {
src = this.a.load();
} else {
address = this.getAddressWithAddressingMode(op);
src = this.load(address);
}
var result = func(src);
if(op.mode.id == this.ADDRESSINGS.ACCUMULATOR.id) {
this.a.store(result);
} else {
this.store(address, result);
}
},
getAddressWithAddressingMode: function(op) {
var address = null;
switch(op.mode.id) {
case this.ADDRESSINGS.IMMEDIATE.id:
case this.ADDRESSINGS.RELATIVE.id:
address = this.pc.load();
this.pc.increment();
break;
case this.ADDRESSINGS.ABSOLUTE.id:
case this.ADDRESSINGS.INDEXED_ABSOLUTE_X.id:
case this.ADDRESSINGS.INDEXED_ABSOLUTE_Y.id:
address = this.load2Bytes(this.pc.load());
this.pc.incrementBy2();
switch(op.mode.id) {
case this.ADDRESSINGS.INDEXED_ABSOLUTE_X.id:
address += this.x.load();
break;
case this.ADDRESSINGS.INDEXED_ABSOLUTE_Y.id:
address += this.y.load();
break;
}
address = address & 0xffff;
break;
case this.ADDRESSINGS.ZERO_PAGE.id:
case this.ADDRESSINGS.INDEXED_ZERO_PAGE_X.id:
case this.ADDRESSINGS.INDEXED_ZERO_PAGE_Y.id:
address = this.load(this.pc.load());
this.pc.increment();
switch(op.mode.id) {
case this.ADDRESSINGS.INDEXED_ZERO_PAGE_X.id:
address += this.x.load();
break;
case this.ADDRESSINGS.INDEXED_ZERO_PAGE_Y.id:
address += this.y.load();
break;
}
address = address & 0xff;
break;
case this.ADDRESSINGS.INDIRECT.id:
var tmp = this.load2Bytes(this.pc.load());
this.pc.incrementBy2();
address = this.load2BytesInPage(tmp);
break;
case this.ADDRESSINGS.INDEXED_INDIRECT_X.id:
var tmp = this.load(this.pc.load());
this.pc.increment();
tmp += this.x.load();
tmp = tmp & 0xff;
address = this.load2BytesFromZeropage(tmp);
break;
case this.ADDRESSINGS.INDEXED_INDIRECT_Y.id:
var tmp = this.load(this.pc.load());
this.pc.increment();
address = this.load2BytesFromZeropage(tmp);
address += this.y.load();
address = address & 0xffff;
break;
default:
throw new Error('Cpu: Unkown addressing mode.');
break;
}
return address;
},
/**
*
*/
updateN: function(value) {
if((value & 0x80) === 0)
this.p.clearN();
else
this.p.setN();
},
/**
*
*/
updateZ: function(value) {
if((value & 0xff) === 0)
this.p.setZ();
else
this.p.clearZ();
},
/**
*
*/
updateC: function(value) {
if((value & 0x100) === 0)
this.p.clearC();
else
this.p.setC();
},
getStackAddress: function() {
return this.sp.load() + 0x100;
},
pushStack: function(value) {
this.store(this.getStackAddress(), value);
this.sp.decrement();
},
pushStack2Bytes: function(value) {
this.store(this.getStackAddress(), (value >> 8) & 0xff);
this.sp.decrement();
this.store(this.getStackAddress(), value & 0xff);
this.sp.decrement();
},
popStack: function() {
this.sp.increment();
return this.load(this.getStackAddress());
},
popStack2Bytes: function() {
this.sp.increment();
var value = this.load(this.getStackAddress());
this.sp.increment();
return (this.load(this.getStackAddress()) << 8) | value;
},
doBranch: function(op, flag) {
var result = this.loadWithAddressingMode(op);
if(flag)
this.pc.add(result);
},
operate: function(op, opc) {
switch(op.instruction.id) {
case this.INSTRUCTIONS.ADC.id:
var src1 = this.a.load();
var src2 = this.loadWithAddressingMode(op);
var c = this.p.isC() ? 1 : 0;
var result = src1 + src2 + c;
this.a.store(result);
this.updateN(result)
this.updateZ(result)
this.updateC(result)
if(!((src1 ^ src2) & 0x80) && ((src2 ^ result) & 0x80))
this.p.setV();
else
this.p.clearV();
break;
case this.INSTRUCTIONS.AND.id:
var src1 = this.a.load();
var src2 = this.loadWithAddressingMode(op);
var result = src1 & src2;
this.a.store(result);
this.updateN(result);
this.updateZ(result);
break;
case this.INSTRUCTIONS.ASL.id:
var self = this;
var func = function(src) {
var result = src << 1;
self.updateN(result)
self.updateZ(result);
self.updateC(result);
return result;
};
this.updateMemoryWithAddressingMode(op, func);
break;
case this.INSTRUCTIONS.BCC.id:
this.doBranch(op, !this.p.isC());
break;
case this.INSTRUCTIONS.BCS.id:
this.doBranch(op, this.p.isC());
break;
case this.INSTRUCTIONS.BEQ.id:
this.doBranch(op, this.p.isZ());
break;
// TODO: check logic.
case this.INSTRUCTIONS.BIT.id:
var src1 = this.a.load();
var src2 = this.loadWithAddressingMode(op);
var result = src1 & src2;
this.updateN(src2);
this.updateZ(result);
if((src2 & 0x40) == 0)
this.p.clearV();
else
this.p.setV();
break;
case this.INSTRUCTIONS.BMI.id:
this.doBranch(op, this.p.isN());
break;
case this.INSTRUCTIONS.BNE.id:
this.doBranch(op, !this.p.isZ());
break;
case this.INSTRUCTIONS.BPL.id:
this.doBranch(op, !this.p.isN());
break;
case this.INSTRUCTIONS.BRK.id:
this.pc.increment(); // seems like necessary
this.p.setA();
this.p.setB();
this.interrupt(this.INTERRUPTS.BRK);
break;
case this.INSTRUCTIONS.BVC.id:
this.doBranch(op, !this.p.isV());
break;
case this.INSTRUCTIONS.BVS.id:
this.doBranch(op, this.p.isV());
break;
case this.INSTRUCTIONS.CLC.id:
this.p.clearC();
break;
case this.INSTRUCTIONS.CLD.id:
this.p.clearD();
break;