package core6502 /* For the diffrences with NMOS6502 see: http://6502.org/tutorials/65c02opcodes.html http://wilsonminesco.com/NMOS-CMOSdif/ http://www.obelisk.me.uk/65C02/reference.html http://www.obelisk.me.uk/65C02/addressing.html http://anyplatform.net/media/guides/cpus/65xx%20Processor%20Data.txt */ // NewCMOS65c02 returns an initialized 65c02 func NewCMOS65c02(m Memory) *State { var s State s.mem = m var opcodes [256]opcode for i := 0; i < 256; i++ { opcodes[i] = opcodesNMOS6502[i] if opcodes65c02Delta[i].cycles != 0 { opcodes[i] = opcodes65c02Delta[i] } } add65c02NOPs(&opcodes) s.opcodes = &opcodes return &s } func add65c02NOPs(opcodes *[256]opcode) { nop11 := opcode{"NOP", 1, 1, modeImplicit, opNOP} nop22 := opcode{"NOP", 2, 2, modeImmediate, opNOP} nop23 := opcode{"NOP", 2, 3, modeImmediate, opNOP} nop24 := opcode{"NOP", 2, 4, modeImmediate, opNOP} nop34 := opcode{"NOP", 3, 4, modeAbsolute, opNOP} nop38 := opcode{"NOP", 3, 8, modeAbsolute, opNOP} opcodes[0x02] = nop22 opcodes[0x22] = nop22 opcodes[0x42] = nop22 opcodes[0x62] = nop22 opcodes[0x82] = nop22 opcodes[0xc2] = nop22 opcodes[0xe2] = nop22 opcodes[0x44] = nop23 opcodes[0x54] = nop24 opcodes[0xD4] = nop24 opcodes[0xF4] = nop24 opcodes[0x5c] = nop38 opcodes[0xdc] = nop34 opcodes[0xfc] = nop34 for i := 0; i < 0x100; i = i + 0x10 { opcodes[i+0x03] = nop11 // RMB and SMB; opcodes[i+0x07] = nop11 opcodes[i+0x0b] = nop11 // BBR and BBS: opcodes[i+0x0f] = nop11 } // Detection of 65c816 opcodes[0xbf].name = "XCE" } var opcodes65c02Delta = [256]opcode{ // Functional difference 0x00: {"BRK", 1, 7, modeImplicit, opBRKAlt}, 0x24: {"BIT", 2, 3, modeZeroPage, opBIT}, 0x2C: {"BIT", 3, 3, modeAbsolute, opBIT}, // Fixed BCD arithmetic flags 0x69: {"ADC", 2, 2, modeImmediate, opADCAlt}, 0x65: {"ADC", 2, 3, modeZeroPage, opADCAlt}, 0x75: {"ADC", 2, 4, modeZeroPageX, opADCAlt}, 0x6D: {"ADC", 3, 4, modeAbsolute, opADCAlt}, 0x7D: {"ADC", 3, 4, modeAbsoluteX, opADCAlt}, // Extra cycles 0x79: {"ADC", 3, 4, modeAbsoluteY, opADCAlt}, // Extra cycles 0x61: {"ADC", 2, 6, modeIndexedIndirectX, opADCAlt}, 0x71: {"ADC", 2, 5, modeIndirectIndexedY, opADCAlt}, // Extra cycles 0xE9: {"SBC", 2, 2, modeImmediate, opSBCAlt}, 0xE5: {"SBC", 2, 3, modeZeroPage, opSBCAlt}, 0xF5: {"SBC", 2, 4, modeZeroPageX, opSBCAlt}, 0xED: {"SBC", 3, 4, modeAbsolute, opSBCAlt}, 0xFD: {"SBC", 3, 4, modeAbsoluteX, opSBCAlt}, // Extra cycles 0xF9: {"SBC", 3, 4, modeAbsoluteY, opSBCAlt}, // Extra cycles 0xE1: {"SBC", 2, 6, modeIndexedIndirectX, opSBCAlt}, 0xF1: {"SBC", 2, 5, modeIndirectIndexedY, opSBCAlt}, // Extra cycles // Different cycle count 0x1e: {"ASL", 3, 6, modeAbsoluteX, buildOpShift(true, false)}, 0x3e: {"ROL", 3, 6, modeAbsoluteX, buildOpShift(true, true)}, 0x5e: {"LSR", 3, 6, modeAbsoluteX, buildOpShift(false, false)}, 0x7e: {"ROR", 3, 6, modeAbsoluteX, buildOpShift(false, true)}, // New indirect zero page addresssing mode 0x12: {"ORA", 2, 5, modeIndirectZeroPage, buildOpLogic(operationOr)}, 0x32: {"AND", 2, 5, modeIndirectZeroPage, buildOpLogic(operationAnd)}, 0x52: {"EOR", 2, 5, modeIndirectZeroPage, buildOpLogic(operationXor)}, 0x72: {"ADC", 2, 5, modeIndirectZeroPage, opADCAlt}, 0x92: {"STA", 2, 5, modeIndirectZeroPage, buildOpStore(regA)}, 0xb2: {"LDA", 2, 5, modeIndirectZeroPage, buildOpLoad(regA)}, 0xd2: {"CMP", 2, 5, modeIndirectZeroPage, buildOpCompare(regA)}, 0xf2: {"SBC", 2, 5, modeIndirectZeroPage, opSBCAlt}, // New addressing options 0x89: {"BIT", 2, 2, modeImmediate, opBIT}, 0x34: {"BIT", 2, 4, modeZeroPageX, opBIT}, 0x3c: {"BIT", 3, 4, modeAbsoluteX, opBIT}, // Extra cycles 0x1a: {"INC", 1, 2, modeAccumulator, buildOpIncDec(true)}, 0x3a: {"DEC", 1, 2, modeAccumulator, buildOpIncDec(false)}, 0x7c: {"JMP", 3, 6, modeAbsoluteIndexedIndirectX, opJMP}, // Additional instructions: BRA, PHX, PHY, PLX, PLY, STZ, TRB, TSB 0xda: {"PHX", 1, 3, modeImplicit, buildOpPush(regX)}, 0x5a: {"PHY", 1, 3, modeImplicit, buildOpPush(regY)}, 0xfa: {"PLX", 1, 4, modeImplicit, buildOpPull(regX)}, 0x7a: {"PLY", 1, 4, modeImplicit, buildOpPull(regY)}, 0x80: {"BRA", 2, 4, modeRelative, opJMP}, // Extra cycles 0x64: {"STZ", 2, 3, modeZeroPage, opSTZ}, 0x74: {"STZ", 2, 4, modeZeroPageX, opSTZ}, 0x9c: {"STZ", 3, 4, modeAbsolute, opSTZ}, 0x9e: {"STZ", 3, 5, modeAbsoluteX, opSTZ}, 0x14: {"TRB", 2, 5, modeZeroPage, opTRB}, 0x1c: {"TRB", 3, 6, modeAbsolute, opTRB}, 0x04: {"TSB", 2, 5, modeZeroPage, opTSB}, 0x0c: {"TSB", 3, 6, modeAbsolute, opTSB}, // Additional in Rockwell 65c02 and WDC 65c02? // They have a double addressing mode: zeropage and relative. 0x0f: {"BBR0", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(0, false)}, // Extra cycles 0x1f: {"BBR1", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(1, false)}, // Extra cycles 0x2f: {"BBR2", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(2, false)}, // Extra cycles 0x3f: {"BBR3", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(3, false)}, // Extra cycles 0x4f: {"BBR4", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(4, false)}, // Extra cycles 0x5f: {"BBR5", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(5, false)}, // Extra cycles 0x6f: {"BBR6", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(6, false)}, // Extra cycles 0x7f: {"BBR7", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(7, false)}, // Extra cycles 0x8f: {"BBS0", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(0, true)}, // Extra cycles 0x9f: {"BBS1", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(1, true)}, // Extra cycles 0xaf: {"BBS2", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(2, true)}, // Extra cycles 0xbf: {"BBS3", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(3, true)}, // Extra cycles 0xcf: {"BBS4", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(4, true)}, // Extra cycles 0xdf: {"BBS5", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(5, true)}, // Extra cycles 0xef: {"BBS6", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(6, true)}, // Extra cycles 0xff: {"BBS7", 3, 2, modeZeroPageAndRelative, buildOpBranchOnBit(7, true)}, // Extra cycles 0x07: {"RMB0", 2, 5, modeZeroPage, buildOpSetBit(0, false)}, 0x17: {"RMB1", 2, 5, modeZeroPage, buildOpSetBit(1, false)}, 0x27: {"RMB2", 2, 5, modeZeroPage, buildOpSetBit(2, false)}, 0x37: {"RMB3", 2, 5, modeZeroPage, buildOpSetBit(3, false)}, 0x47: {"RMB4", 2, 5, modeZeroPage, buildOpSetBit(4, false)}, 0x57: {"RMB5", 2, 5, modeZeroPage, buildOpSetBit(5, false)}, 0x67: {"RMB6", 2, 5, modeZeroPage, buildOpSetBit(6, false)}, 0x77: {"RMB7", 2, 5, modeZeroPage, buildOpSetBit(7, false)}, 0x87: {"SMB0", 2, 5, modeZeroPage, buildOpSetBit(0, true)}, 0x97: {"SMB1", 2, 5, modeZeroPage, buildOpSetBit(1, true)}, 0xa7: {"SMB2", 2, 5, modeZeroPage, buildOpSetBit(2, true)}, 0xb7: {"SMB3", 2, 5, modeZeroPage, buildOpSetBit(3, true)}, 0xc7: {"SMB4", 2, 5, modeZeroPage, buildOpSetBit(4, true)}, 0xd7: {"SMB5", 2, 5, modeZeroPage, buildOpSetBit(5, true)}, 0xe7: {"SMB6", 2, 5, modeZeroPage, buildOpSetBit(6, true)}, 0xf7: {"SMB7", 2, 5, modeZeroPage, buildOpSetBit(7, true)}, // Maybe additional Rockwell: STP, WAI }