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DavidBasarab/6502_instructions.json

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Last active October 27, 2019 01:43
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6502 instruction set in JSON
Raw
6502_instructions.json
[
{
"mode" : "Immediate",
"cycles" : "2",
"opcode" : "$69",
"description" : "Add with Carry",
"bytes" : "2",
"name" : "ADC"
},
{
"name" : "ADC",
"bytes" : "2",
"description" : "Add with Carry",
"cycles" : "3",
"opcode" : "$65",
"mode" : "ZeroPage"
},
{
"opcode" : "$75",
"cycles" : "4",
"mode" : "ZeroPage,X",
"name" : "ADC",
"description" : "Add with Carry",
"bytes" : "2"
},
{
"name" : "ADC",
"description" : "Add with Carry",
"bytes" : "3",
"opcode" : "$6D",
"cycles" : "4",
"mode" : "Absolute"
},
{
"mode" : "Absolute,X",
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$7D",
"description" : "Add with Carry",
"bytes" : "3",
"name" : "ADC"
},
{
"name" : "ADC",
"description" : "Add with Carry",
"bytes" : "3",
"opcode" : "$79",
"cycles" : "4(+1ifpagecrossed)",
"mode" : "Absolute,Y"
},
{
"bytes" : "2",
"description" : "Add with Carry",
"name" : "ADC",
"mode" : "(Indirect,X)",
"cycles" : "6",
"opcode" : "$61"
},
{
"description" : "Add with Carry",
"bytes" : "2",
"name" : "ADC",
"mode" : "(Indirect),Y",
"cycles" : "5(+1ifpagecrossed)",
"opcode" : "$71"
},
{
"opcode" : "$29",
"cycles" : "2",
"mode" : "Immediate",
"name" : "AND",
"description" : "Logical AND",
"bytes" : "2"
},
{
"opcode" : "$25",
"cycles" : "3",
"mode" : "ZeroPage",
"name" : "AND",
"description" : "Logical AND",
"bytes" : "2"
},
{
"bytes" : "2",
"description" : "Logical AND",
"name" : "AND",
"mode" : "ZeroPage,X",
"cycles" : "4",
"opcode" : "$35"
},
{
"description" : "Logical AND",
"bytes" : "3",
"name" : "AND",
"mode" : "Absolute",
"cycles" : "4",
"opcode" : "$2D"
},
{
"bytes" : "3",
"description" : "Logical AND",
"name" : "AND",
"mode" : "Absolute,X",
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$3D"
},
{
"mode" : "Absolute,Y",
"opcode" : "$39",
"cycles" : "4(+1ifpagecrossed)",
"description" : "Logical AND",
"bytes" : "3",
"name" : "AND"
},
{
"description" : "Logical AND",
"bytes" : "2",
"name" : "AND",
"mode" : "(Indirect,X)",
"cycles" : "6",
"opcode" : "$21"
},
{
"bytes" : "2",
"description" : "Logical AND",
"name" : "AND",
"mode" : "(Indirect),Y",
"cycles" : "5(+1ifpagecrossed)",
"opcode" : "$31"
},
{
"mode" : "Accumulator",
"cycles" : "2",
"opcode" : "$0A",
"bytes" : "1",
"description" : "Arithmetic Shift Left",
"name" : "ASL"
},
{
"name" : "ASL",
"description" : "Arithmetic Shift Left",
"bytes" : "2",
"cycles" : "5",
"opcode" : "$06",
"mode" : "ZeroPage"
},
{
"name" : "ASL",
"description" : "Arithmetic Shift Left",
"bytes" : "2",
"opcode" : "$16",
"cycles" : "6",
"mode" : "ZeroPage,X"
},
{
"cycles" : "6",
"opcode" : "$0E",
"mode" : "Absolute",
"name" : "ASL",
"description" : "Arithmetic Shift Left",
"bytes" : "3"
},
{
"opcode" : "$1E",
"cycles" : "7",
"mode" : "Absolute,X",
"name" : "ASL",
"bytes" : "3",
"description" : "Arithmetic Shift Left"
},
{
"name" : "BCC",
"bytes" : "2",
"description" : "Branch if Carry Clear",
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"opcode" : "$90",
"mode" : "Relative"
},
{
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"opcode" : "$B0",
"mode" : "Relative",
"name" : "BCS",
"bytes" : "2",
"description" : "Branch if Carry Set"
},
{
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"opcode" : "$F0",
"mode" : "Relative",
"name" : "BEQ",
"bytes" : "2",
"description" : "Branch if Equal"
},
{
"mode" : "ZeroPage",
"opcode" : "$24",
"cycles" : "3",
"description" : "Bit Test",
"bytes" : "2",
"name" : "BIT"
},
{
"description" : "Bit Test",
"bytes" : "3",
"name" : "BIT",
"mode" : "Absolute",
"opcode" : "$2C",
"cycles" : "4"
},
{
"mode" : "Relative",
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"opcode" : "$30",
"description" : "Branch if Minus",
"bytes" : "2",
"name" : "BMI"
},
{
"description" : "Branch if Not Equal",
"bytes" : "2",
"name" : "BNE",
"mode" : "Relative",
"opcode" : "$D0",
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)"
},
{
"name" : "BPL",
"bytes" : "2",
"description" : "Branch if Positive",
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"opcode" : "$10",
"mode" : "Relative"
},
{
"mode" : "Implied",
"opcode" : "$00",
"cycles" : "7",
"bytes" : "1",
"description" : "Force Interrupt",
"name" : "BRK"
},
{
"name" : "BVC",
"description" : "Branch if Overflow Clear",
"bytes" : "2",
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"opcode" : "$50",
"mode" : "Relative"
},
{
"mode" : "Relative",
"opcode" : "$70",
"cycles" : "2(+1ifbranchsucceeds+2iftoanewpage)",
"description" : "Branch if Overflow Set",
"bytes" : "2",
"name" : "BVS"
},
{
"opcode" : "$18",
"cycles" : "2",
"mode" : "Implied",
"name" : "CLC",
"description" : "Clear Carry Flag",
"bytes" : "1"
},
{
"name" : "CLD",
"bytes" : "1",
"description" : "Clear Decimal Mode",
"opcode" : "$D8",
"cycles" : "2",
"mode" : "Implied"
},
{
"opcode" : "$58",
"cycles" : "2",
"mode" : "Implied",
"name" : "CLI",
"description" : "Clear Interrupt Disable",
"bytes" : "1"
},
{
"name" : "CLV",
"description" : "Clear Overflow Flag",
"bytes" : "1",
"opcode" : "$B8",
"cycles" : "2",
"mode" : "Implied"
},
{
"bytes" : "2",
"description" : "Compare",
"name" : "CMP",
"mode" : "Immediate",
"opcode" : "$C9",
"cycles" : "2"
},
{
"cycles" : "3",
"opcode" : "$C5",
"mode" : "ZeroPage",
"name" : "CMP",
"bytes" : "2",
"description" : "Compare"
},
{
"name" : "CMP",
"description" : "Compare",
"bytes" : "2",
"cycles" : "4",
"opcode" : "$D5",
"mode" : "ZeroPage,X"
},
{
"mode" : "Absolute",
"cycles" : "4",
"opcode" : "$CD",
"bytes" : "3",
"description" : "Compare",
"name" : "CMP"
},
{
"mode" : "Absolute,X",
"opcode" : "$DD",
"cycles" : "4(+1ifpagecrossed)",
"description" : "Compare",
"bytes" : "3",
"name" : "CMP"
},
{
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$D9",
"mode" : "Absolute,Y",
"name" : "CMP",
"description" : "Compare",
"bytes" : "3"
},
{
"name" : "CMP",
"bytes" : "2",
"description" : "Compare",
"opcode" : "$C1",
"cycles" : "6",
"mode" : "(Indirect,X)"
},
{
"opcode" : "$D1",
"cycles" : "5(+1ifpagecrossed)",
"mode" : "(Indirect),Y",
"name" : "CMP",
"bytes" : "2",
"description" : "Compare"
},
{
"name" : "CPX",
"bytes" : "2",
"description" : "Compare X Register",
"opcode" : "$E0",
"cycles" : "2",
"mode" : "Immediate"
},
{
"opcode" : "$E4",
"cycles" : "3",
"mode" : "ZeroPage",
"name" : "CPX",
"bytes" : "2",
"description" : "Compare X Register"
},
{
"mode" : "Absolute",
"cycles" : "4",
"opcode" : "$EC",
"bytes" : "3",
"description" : "Compare X Register",
"name" : "CPX"
},
{
"description" : "Compare Y Register",
"bytes" : "2",
"name" : "CPY",
"mode" : "Immediate",
"cycles" : "2",
"opcode" : "$C0"
},
{
"name" : "CPY",
"bytes" : "2",
"description" : "Compare Y Register",
"cycles" : "3",
"opcode" : "$C4",
"mode" : "ZeroPage"
},
{
"mode" : "Absolute",
"opcode" : "$CC",
"cycles" : "4",
"description" : "Compare Y Register",
"bytes" : "3",
"name" : "CPY"
},
{
"mode" : "ZeroPage",
"opcode" : "$C6",
"cycles" : "5",
"description" : "Decrement Memory",
"bytes" : "2",
"name" : "DEC"
},
{
"mode" : "ZeroPage,X",
"opcode" : "$D6",
"cycles" : "6",
"description" : "Decrement Memory",
"bytes" : "2",
"name" : "DEC"
},
{
"opcode" : "$CE",
"cycles" : "6",
"mode" : "Absolute",
"name" : "DEC",
"bytes" : "3",
"description" : "Decrement Memory"
},
{
"description" : "Decrement Memory",
"bytes" : "3",
"name" : "DEC",
"mode" : "Absolute,X",
"cycles" : "7",
"opcode" : "$DE"
},
{
"cycles" : "2",
"opcode" : "$CA",
"mode" : "Implied",
"name" : "DEX",
"bytes" : "1",
"description" : "Decrement X Register"
},
{
"name" : "DEY",
"description" : "Decrement Y Register",
"bytes" : "1",
"opcode" : "$88",
"cycles" : "2",
"mode" : "Implied"
},
{
"mode" : "Immediate",
"opcode" : "$49",
"cycles" : "2",
"bytes" : "2",
"description" : "Exclusive OR",
"name" : "EOR"
},
{
"bytes" : "2",
"description" : "Exclusive OR",
"name" : "EOR",
"mode" : "ZeroPage",
"cycles" : "3",
"opcode" : "$45"
},
{
"mode" : "ZeroPage,X",
"opcode" : "$55",
"cycles" : "4",
"description" : "Exclusive OR",
"bytes" : "2",
"name" : "EOR"
},
{
"name" : "EOR",
"description" : "Exclusive OR",
"bytes" : "3",
"opcode" : "$4D",
"cycles" : "4",
"mode" : "Absolute"
},
{
"mode" : "Absolute,X",
"opcode" : "$5D",
"cycles" : "4(+1ifpagecrossed)",
"description" : "Exclusive OR",
"bytes" : "3",
"name" : "EOR"
},
{
"mode" : "Absolute,Y",
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$59",
"description" : "Exclusive OR",
"bytes" : "3",
"name" : "EOR"
},
{
"name" : "EOR",
"bytes" : "2",
"description" : "Exclusive OR",
"opcode" : "$41",
"cycles" : "6",
"mode" : "(Indirect,X)"
},
{
"description" : "Exclusive OR",
"bytes" : "2",
"name" : "EOR",
"mode" : "(Indirect),Y",
"cycles" : "5(+1ifpagecrossed)",
"opcode" : "$51"
},
{
"name" : "INC",
"bytes" : "2",
"description" : "Increment Memory",
"cycles" : "5",
"opcode" : "$E6",
"mode" : "ZeroPage"
},
{
"description" : "Increment Memory",
"bytes" : "2",
"name" : "INC",
"mode" : "ZeroPage,X",
"cycles" : "6",
"opcode" : "$F6"
},
{
"name" : "INC",
"bytes" : "3",
"description" : "Increment Memory",
"cycles" : "6",
"opcode" : "$EE",
"mode" : "Absolute"
},
{
"name" : "INC",
"description" : "Increment Memory",
"bytes" : "3",
"cycles" : "7",
"opcode" : "$FE",
"mode" : "Absolute,X"
},
{
"description" : "Increment X Register",
"bytes" : "1",
"name" : "INX",
"mode" : "Implied",
"opcode" : "$E8",
"cycles" : "2"
},
{
"name" : "INY",
"bytes" : "1",
"description" : "Increment Y Register",
"opcode" : "$C8",
"cycles" : "2",
"mode" : "Implied"
},
{
"opcode" : "$4C",
"cycles" : "3",
"mode" : "Absolute",
"name" : "JMP",
"description" : "Jump",
"bytes" : "3"
},
{
"description" : "Jump",
"bytes" : "3",
"name" : "JMP",
"mode" : "Indirect�",
"cycles" : "5",
"opcode" : "$6C"
},
{
"name" : "JSR",
"bytes" : "3",
"description" : "Jump to Subroutine",
"opcode" : "$20",
"cycles" : "6",
"mode" : "Absolute"
},
{
"bytes" : "2",
"description" : "Load Accumulator",
"name" : "LDA",
"mode" : "Immediate",
"opcode" : "$A9",
"cycles" : "2"
},
{
"description" : "Load Accumulator",
"bytes" : "2",
"name" : "LDA",
"mode" : "ZeroPage",
"opcode" : "$A5",
"cycles" : "3"
},
{
"name" : "LDA",
"description" : "Load Accumulator",
"bytes" : "2",
"opcode" : "$B5",
"cycles" : "4",
"mode" : "ZeroPage,X"
},
{
"mode" : "Absolute",
"opcode" : "$AD",
"cycles" : "4",
"bytes" : "3",
"description" : "Load Accumulator",
"name" : "LDA"
},
{
"name" : "LDA",
"bytes" : "3",
"description" : "Load Accumulator",
"opcode" : "$BD",
"cycles" : "4(+1ifpagecrossed)",
"mode" : "Absolute,X"
},
{
"mode" : "Absolute,Y",
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$B9",
"description" : "Load Accumulator",
"bytes" : "3",
"name" : "LDA"
},
{
"mode" : "(Indirect,X)",
"cycles" : "6",
"opcode" : "$A1",
"bytes" : "2",
"description" : "Load Accumulator",
"name" : "LDA"
},
{
"mode" : "(Indirect),Y",
"opcode" : "$B1",
"cycles" : "5(+1ifpagecrossed)",
"bytes" : "2",
"description" : "Load Accumulator",
"name" : "LDA"
},
{
"cycles" : "2",
"opcode" : "$A2",
"mode" : "Immediate",
"name" : "LDX",
"bytes" : "2",
"description" : "Load X Register"
},
{
"cycles" : "3",
"opcode" : "$A6",
"mode" : "ZeroPage",
"name" : "LDX",
"bytes" : "2",
"description" : "Load X Register"
},
{
"description" : "Load X Register",
"bytes" : "2",
"name" : "LDX",
"mode" : "ZeroPage,Y",
"opcode" : "$B6",
"cycles" : "4"
},
{
"cycles" : "4",
"opcode" : "$AE",
"mode" : "Absolute",
"name" : "LDX",
"description" : "Load X Register",
"bytes" : "3"
},
{
"opcode" : "$BE",
"cycles" : "4(+1ifpagecrossed)",
"mode" : "Absolute,Y",
"name" : "LDX",
"description" : "Load X Register",
"bytes" : "3"
},
{
"mode" : "Immediate",
"cycles" : "2",
"opcode" : "$A0",
"description" : "Load Y Register",
"bytes" : "2",
"name" : "LDY"
},
{
"name" : "LDY",
"bytes" : "2",
"description" : "Load Y Register",
"cycles" : "3",
"opcode" : "$A4",
"mode" : "ZeroPage"
},
{
"bytes" : "2",
"description" : "Load Y Register",
"name" : "LDY",
"mode" : "ZeroPage,X",
"cycles" : "4",
"opcode" : "$B4"
},
{
"mode" : "Absolute",
"cycles" : "4",
"opcode" : "$AC",
"bytes" : "3",
"description" : "Load Y Register",
"name" : "LDY"
},
{
"name" : "LDY",
"bytes" : "3",
"description" : "Load Y Register",
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$BC",
"mode" : "Absolute,X"
},
{
"description" : "Logical Shift Right",
"bytes" : "1",
"name" : "LSR",
"mode" : "Accumulator",
"cycles" : "2",
"opcode" : "$4A"
},
{
"opcode" : "$46",
"cycles" : "5",
"mode" : "ZeroPage",
"name" : "LSR",
"bytes" : "2",
"description" : "Logical Shift Right"
},
{
"mode" : "ZeroPage,X",
"cycles" : "6",
"opcode" : "$56",
"description" : "Logical Shift Right",
"bytes" : "2",
"name" : "LSR"
},
{
"opcode" : "$4E",
"cycles" : "6",
"mode" : "Absolute",
"name" : "LSR",
"description" : "Logical Shift Right",
"bytes" : "3"
},
{
"mode" : "Absolute,X",
"cycles" : "7",
"opcode" : "$5E",
"bytes" : "3",
"description" : "Logical Shift Right",
"name" : "LSR"
},
{
"name" : "NOP",
"bytes" : "1",
"description" : "No Operation",
"opcode" : "$EA",
"cycles" : "2",
"mode" : "Implied"
},
{
"mode" : "Immediate",
"opcode" : "$09",
"cycles" : "2",
"bytes" : "2",
"description" : "Logical Inclusive OR",
"name" : "ORA"
},
{
"cycles" : "3",
"opcode" : "$05",
"mode" : "ZeroPage",
"name" : "ORA",
"description" : "Logical Inclusive OR",
"bytes" : "2"
},
{
"mode" : "ZeroPage,X",
"opcode" : "$15",
"cycles" : "4",
"description" : "Logical Inclusive OR",
"bytes" : "2",
"name" : "ORA"
},
{
"mode" : "Absolute",
"cycles" : "4",
"opcode" : "$0D",
"description" : "Logical Inclusive OR",
"bytes" : "3",
"name" : "ORA"
},
{
"opcode" : "$1D",
"cycles" : "4(+1ifpagecrossed)",
"mode" : "Absolute,X",
"name" : "ORA",
"bytes" : "3",
"description" : "Logical Inclusive OR"
},
{
"mode" : "Absolute,Y",
"opcode" : "$19",
"cycles" : "4(+1ifpagecrossed)",
"description" : "Logical Inclusive OR",
"bytes" : "3",
"name" : "ORA"
},
{
"mode" : "(Indirect,X)",
"opcode" : "$01",
"cycles" : "6",
"description" : "Logical Inclusive OR",
"bytes" : "2",
"name" : "ORA"
},
{
"cycles" : "5(+1ifpagecrossed)",
"opcode" : "$11",
"mode" : "(Indirect),Y",
"name" : "ORA",
"bytes" : "2",
"description" : "Logical Inclusive OR"
},
{
"opcode" : "$48",
"cycles" : "3",
"mode" : "Implied",
"name" : "PHA",
"bytes" : "1",
"description" : "Push Accumulator"
},
{
"opcode" : "$08",
"cycles" : "3",
"mode" : "Implied",
"name" : "PHP",
"description" : "Push Processor Status",
"bytes" : "1"
},
{
"description" : "Pull Accumulator",
"bytes" : "1",
"name" : "PLA",
"mode" : "Implied",
"cycles" : "4",
"opcode" : "$68"
},
{
"cycles" : "4",
"opcode" : "$28",
"mode" : "Implied",
"name" : "PLP",
"description" : "Pull Processor Status",
"bytes" : "1"
},
{
"mode" : "Accumulator",
"cycles" : "2",
"opcode" : "$2A",
"description" : "Rotate Left",
"bytes" : "1",
"name" : "ROL"
},
{
"mode" : "ZeroPage",
"opcode" : "$26",
"cycles" : "5",
"bytes" : "2",
"description" : "Rotate Left",
"name" : "ROL"
},
{
"opcode" : "$36",
"cycles" : "6",
"mode" : "ZeroPage,X",
"name" : "ROL",
"description" : "Rotate Left",
"bytes" : "2"
},
{
"mode" : "Absolute",
"opcode" : "$2E",
"cycles" : "6",
"bytes" : "3",
"description" : "Rotate Left",
"name" : "ROL"
},
{
"mode" : "Absolute,X",
"cycles" : "7",
"opcode" : "$3E",
"bytes" : "3",
"description" : "Rotate Left",
"name" : "ROL"
},
{
"mode" : "Accumulator",
"cycles" : "2",
"opcode" : "$6A",
"bytes" : "1",
"description" : "Rotate Right",
"name" : "ROR"
},
{
"mode" : "ZeroPage",
"cycles" : "5",
"opcode" : "$66",
"bytes" : "2",
"description" : "Rotate Right",
"name" : "ROR"
},
{
"name" : "ROR",
"bytes" : "2",
"description" : "Rotate Right",
"cycles" : "6",
"opcode" : "$76",
"mode" : "ZeroPage,X"
},
{
"bytes" : "3",
"description" : "Rotate Right",
"name" : "ROR",
"mode" : "Absolute",
"opcode" : "$6E",
"cycles" : "6"
},
{
"mode" : "Absolute,X",
"cycles" : "7",
"opcode" : "$7E",
"bytes" : "3",
"description" : "Rotate Right",
"name" : "ROR"
},
{
"name" : "RTI",
"description" : "Return from Interrupt",
"bytes" : "1",
"cycles" : "6",
"opcode" : "$40",
"mode" : "Implied"
},
{
"name" : "RTS",
"description" : "Return from Subroutine",
"bytes" : "1",
"opcode" : "$60",
"cycles" : "6",
"mode" : "Implied"
},
{
"bytes" : "2",
"description" : "Subtract with Carry",
"name" : "SBC",
"mode" : "Immediate",
"opcode" : "$E9",
"cycles" : "2"
},
{
"description" : "Subtract with Carry",
"bytes" : "2",
"name" : "SBC",
"mode" : "ZeroPage",
"cycles" : "3",
"opcode" : "$E5"
},
{
"name" : "SBC",
"bytes" : "2",
"description" : "Subtract with Carry",
"opcode" : "$F5",
"cycles" : "4",
"mode" : "ZeroPage,X"
},
{
"description" : "Subtract with Carry",
"bytes" : "3",
"name" : "SBC",
"mode" : "Absolute",
"cycles" : "4",
"opcode" : "$ED"
},
{
"bytes" : "3",
"description" : "Subtract with Carry",
"name" : "SBC",
"mode" : "Absolute,X",
"cycles" : "4(+1ifpagecrossed)",
"opcode" : "$FD"
},
{
"description" : "Subtract with Carry",
"bytes" : "3",
"name" : "SBC",
"mode" : "Absolute,Y",
"opcode" : "$F9",
"cycles" : "4(+1ifpagecrossed)"
},
{
"opcode" : "$E1",
"cycles" : "6",
"mode" : "(Indirect,X)",
"name" : "SBC",
"bytes" : "2",
"description" : "Subtract with Carry"
},
{
"name" : "SBC",
"bytes" : "2",
"description" : "Subtract with Carry",
"cycles" : "5(+1ifpagecrossed)",
"opcode" : "$F1",
"mode" : "(Indirect),Y"
},
{
"name" : "SEC",
"bytes" : "1",
"description" : "Set Carry Flag",
"cycles" : "2",
"opcode" : "$38",
"mode" : "Implied"
},
{
"cycles" : "2",
"opcode" : "$F8",
"mode" : "Implied",
"name" : "SED",
"description" : "Set Decimal Flag",
"bytes" : "1"
},
{
"name" : "SEI",
"bytes" : "1",
"description" : "Set Interrupt Disable",
"cycles" : "2",
"opcode" : "$78",
"mode" : "Implied"
},
{
"name" : "STA",
"bytes" : "2",
"description" : "Store Accumulator",
"opcode" : "$85",
"cycles" : "3",
"mode" : "ZeroPage"
},
{
"cycles" : "4",
"opcode" : "$95",
"mode" : "ZeroPage,X",
"name" : "STA",
"bytes" : "2",
"description" : "Store Accumulator"
},
{
"name" : "STA",
"bytes" : "3",
"description" : "Store Accumulator",
"opcode" : "$8D",
"cycles" : "4",
"mode" : "Absolute"
},
{
"mode" : "Absolute,X",
"opcode" : "$9D",
"cycles" : "5",
"bytes" : "3",
"description" : "Store Accumulator",
"name" : "STA"
},
{
"name" : "STA",
"bytes" : "3",
"description" : "Store Accumulator",
"opcode" : "$99",
"cycles" : "5",
"mode" : "Absolute,Y"
},
{
"opcode" : "$81",
"cycles" : "6",
"mode" : "(Indirect,X)",
"name" : "STA",
"bytes" : "2",
"description" : "Store Accumulator"
},
{
"mode" : "(Indirect),Y",
"cycles" : "6",
"opcode" : "$91",
"description" : "Store Accumulator",
"bytes" : "2",
"name" : "STA"
},
{
"opcode" : "$86",
"cycles" : "3",
"mode" : "ZeroPage",
"name" : "STX",
"bytes" : "2",
"description" : "Store X Register"
},
{
"opcode" : "$96",
"cycles" : "4",
"mode" : "ZeroPage,Y",
"name" : "STX",
"bytes" : "2",
"description" : "Store X Register"
},
{
"opcode" : "$8E",
"cycles" : "4",
"mode" : "Absolute",
"name" : "STX",
"description" : "Store X Register",
"bytes" : "3"
},
{
"description" : "Store Y Register",
"bytes" : "2",
"name" : "STY",
"mode" : "ZeroPage",
"cycles" : "3",
"opcode" : "$84"
},
{
"opcode" : "$94",
"cycles" : "4",
"mode" : "ZeroPage,X",
"name" : "STY",
"description" : "Store Y Register",
"bytes" : "2"
},
{
"name" : "STY",
"bytes" : "3",
"description" : "Store Y Register",
"opcode" : "$8C",
"cycles" : "4",
"mode" : "Absolute"
},
{
"mode" : "Implied",
"opcode" : "$AA",
"cycles" : "2",
"bytes" : "1",
"description" : "Transfer Accumulator to X",
"name" : "TAX"
},
{
"name" : "TAY",
"bytes" : "1",
"description" : "Transfer Accumulator to Y",
"cycles" : "2",
"opcode" : "$A8",
"mode" : "Implied"
},
{
"opcode" : "$BA",
"cycles" : "2",
"mode" : "Implied",
"name" : "TSX",
"description" : "Transfer Stack Pointer to X",
"bytes" : "1"
},
{
"mode" : "Implied",
"opcode" : "$8A",
"cycles" : "2",
"bytes" : "1",
"description" : "Transfer X to Accumulator",
"name" : "TXA"
},
{
"mode" : "Implied",
"opcode" : "$9A",
"cycles" : "2",
"bytes" : "1",
"description" : "Transfer X to Stack Pointer",
"name" : "TXS"
},
{
"name" : "TYA",
"description" : "Transfer Y to Accumulator",
"bytes" : "1",
"cycles" : "2",
"opcode" : "$98",
"mode" : "Implied"
}
]
Raw
6502_instructions.pl
#!/usr/bin/perl -w
use JSON;
use HTML::TableExtract;
use LWP::Simple;
use strict;
# Download the file if needed
my $reference = "reference.html";
if (! -f $reference)
{
my $url = "http://www.obelisk.me.uk/6502/reference.html";
getstore($url, $reference);
}
my $html;
{
local $/;
open my $file, '<', $reference or die "Cannot open '$reference': $!\n";
$html = <$file>;
close $file;
}
# Get the instructions and their descriptions from H3 tags
my @headers;
while ($html =~ m{<H3><A NAME="([A-Z]{3})"></A>\1 - (.*)</H3>}g)
{
push @headers, { "name" => "$1", "description" => "$2" };
}
# Parse the tables to gain information about individual instructions
my @instructions;
my $i = 0;
my $te = HTML::TableExtract->new("headers" => [ "Addressing Mode", "Opcode", "Bytes", "Cycles" ]);
$te->parse($html);
for my $ts ($te->tables)
{
for my $row ($ts->rows)
{
s/[\n\s]//g for (@{$row});
push @instructions, {
"name" => $headers[$i]->{"name"},
"description" => $headers[$i]->{"description"},
"mode" => ${$row}[0],
"opcode" => ${$row}[1],
"bytes" => ${$row}[2],
"cycles" => ${$row}[3],
};
}
$i++;
}
my $json = JSON->new();
open (fh, ">", "OpCodes.json");
print fh $json->pretty->encode(\@instructions);
close(fh);
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