de.michab.simulator.mos6502
Class Opcodes

java.lang.Object
  de.michab.simulator.mos6502.Opcodes

public final class Opcodes

extends java.lang.Object

Defines instruction encodings. Note that the attribute names are used to formally encode the addressing mode. This is used in reflective code to compute a human readable instruction representation.

The general format is <instructionName>_<addressingMode>, where the name is defined in numerous 6502 assembly language books and the addressingMode is one of:

Suffix	Comment
IMP	Implicit
IMM	Immediate
ZP	Zero page
ZPX	Zero page, x-register relative
ZPY	Zero page, y-register relative
ABS	Absolute
ABSX	Absolute x
ABSY	Absolute y
IND	Indirect
IZX	X indirect
IZY	Y indirect
REL	Relative

Author:

Michael G. Binz

Field Summary

static int	ADC_ABS
static int	ADC_ABSX
static int	ADC_ABSY
static int	ADC_IMM
static int	ADC_IZX
static int	ADC_IZY
static int	ADC_ZP
static int	ADC_ZPX
static int	AND_ABS
static int	AND_ABSX
static int	AND_ABSY
static int	AND_IMM
static int	AND_IZX
static int	AND_IZY
static int	AND_ZP
static int	AND_ZPX
static int	ASL_ABS
static int	ASL_ABSX
static int	ASL_IMP
static int	ASL_ZP
static int	ASL_ZPX
static int	BCC_REL
static int	BCS_REL
static int	BEQ_REL
static int	BIT_ABS
static int	BIT_ABSX
static int	BIT_ZP
static int	BIT_ZPX
static int	BMI_REL
static int	BNE_REL
static int	BPL_REL
static int	BRK_IMP
static int	BVC_REL
static int	BVS_REL
static int	CLC_IMP
static int	CLD_IMP
static int	CLI_IMP
static int	CLV_IMP
static int	CMP_ABS
static int	CMP_ABSX
static int	CMP_ABSY
static int	CMP_IMM
static int	CMP_IZX
static int	CMP_IZY
static int	CMP_ZP
static int	CMP_ZPX
static int	CPX_ABS
static int	CPX_IMM
static int	CPX_ZP
static int	CPY_ABS
static int	CPY_IMM
static int	CPY_ZP
static int	DEC_ABS
static int	DEC_ABSX
static int	DEC_ZP
static int	DEC_ZPX
static int	DEX_IMP
static int	DEY_IMP
static int	EOR_ABS
static int	EOR_ABSX
static int	EOR_ABSY
static int	EOR_IMM
static int	EOR_IZX
static int	EOR_IZY
static int	EOR_ZP
static int	EOR_ZPX
static int	INC_ABS
static int	INC_ABSX
static int	INC_ZP
static int	INC_ZPX
static int	INX_IMP
static int	INY_IMP
static int	JMP_ABS
static int	JMP_IND
static int	JSR_ABS
static int	LDA_ABS
static int	LDA_ABSX
static int	LDA_ABSY
static int	LDA_IMM
static int	LDA_IZX
static int	LDA_IZY
static int	LDA_ZP
static int	LDA_ZPX
static int	LDX_ABS
static int	LDX_ABSY
static int	LDX_IMM
static int	LDX_ZP
static int	LDX_ZPY
static int	LDY_ABS
static int	LDY_ABSX
static int	LDY_IMM
static int	LDY_ZP
static int	LDY_ZPX
static int	LSR_ABS
static int	LSR_ABSX
static int	LSR_IMP
static int	LSR_ZP
static int	LSR_ZPX
static int	NOP_IMP
static int	ORA_ABS
static int	ORA_ABSX
static int	ORA_ABSY
static int	ORA_IMM
static int	ORA_IZX
static int	ORA_IZY
static int	ORA_ZP
static int	ORA_ZPX
static int	PHA_IMP
static int	PHP_IMP
static int	PLA_IMP
static int	PLP_IMP
static int	ROL_ABS
static int	ROL_ABSX
static int	ROL_IMP
static int	ROL_ZP
static int	ROL_ZPX
static int	ROR_ABS
static int	ROR_ABSX
static int	ROR_IMP
static int	ROR_ZP
static int	ROR_ZPX
static int	RTI_IMP
static int	RTS_IMP
static int	SBC_ABS
static int	SBC_ABSX
static int	SBC_ABSY
static int	SBC_IMM
static int	SBC_IZX
static int	SBC_IZY
static int	SBC_ZP
static int	SBC_ZPX
static int	SEC_IMP
static int	SED_IMP
static int	SEI_IMP
static int	STA_ABS
static int	STA_ABSX
static int	STA_ABSY
static int	STA_IZX
static int	STA_IZY
static int	STA_ZP
static int	STA_ZPX
static int	STX_ABS
static int	STX_ZP
static int	STX_ZPY
static int	STY_ABS
static int	STY_ZP
static int	STY_ZPX
static int	TAX_IMP
static int	TAY_IMP
static int	TSX_IMP
static int	TXA_IMP
static int	TXS_IMP
static int	TYA_IMP
static int	uLSE_ABS
static int	uLSE_ABSX
static int	uLSE_ABSY
static int	uLSE_IZX
static int	uLSE_IZY
static int	uLSE_ZP
static int	uLSE_ZPX
static int	uSAX_ABS
static int	uSAX_IZX
static int	uSAX_ZP
static int	uSAX_ZPY

Method Summary

static int	getEncodingLength(int opcode) Get the length that an instruction based on the passed opcode uses in memory.
static java.lang.String	getText(int opcode) Returns the textual representation for the passed opcode.
static int	getTime(int opcode) Get the number of cycles required to execute the passed opcode.
static boolean	isValidOpcode(int opcode) Checks whether the passed opcode is valid.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ADC_IMM

public static final int ADC_IMM

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Constant Field Values

ADC_ZP

public static final int ADC_ZP

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ADC_ZPX

public static final int ADC_ZPX

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ADC_ABS

public static final int ADC_ABS

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ADC_ABSX

public static final int ADC_ABSX

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ADC_ABSY

public static final int ADC_ABSY

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ADC_IZX

public static final int ADC_IZX

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ADC_IZY

public static final int ADC_IZY

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AND_IMM

public static final int AND_IMM

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AND_ZP

public static final int AND_ZP

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AND_ZPX

public static final int AND_ZPX

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AND_IZX

public static final int AND_IZX

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AND_IZY

public static final int AND_IZY

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AND_ABS

public static final int AND_ABS

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AND_ABSX

public static final int AND_ABSX

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AND_ABSY

public static final int AND_ABSY

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ASL_IMP

public static final int ASL_IMP

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ASL_ZP

public static final int ASL_ZP

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ASL_ZPX

public static final int ASL_ZPX

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ASL_ABS

public static final int ASL_ABS

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ASL_ABSX

public static final int ASL_ABSX

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BCC_REL

public static final int BCC_REL

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BCS_REL

public static final int BCS_REL

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BEQ_REL

public static final int BEQ_REL

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BIT_ZP

public static final int BIT_ZP

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BIT_ZPX

public static final int BIT_ZPX

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BIT_ABS

public static final int BIT_ABS

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BIT_ABSX

public static final int BIT_ABSX

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BMI_REL

public static final int BMI_REL

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BNE_REL

public static final int BNE_REL

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BPL_REL

public static final int BPL_REL

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BRK_IMP

public static final int BRK_IMP

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BVC_REL

public static final int BVC_REL

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BVS_REL

public static final int BVS_REL

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CLC_IMP

public static final int CLC_IMP

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CLD_IMP

public static final int CLD_IMP

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CLI_IMP

public static final int CLI_IMP

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CLV_IMP

public static final int CLV_IMP

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CMP_IMM

public static final int CMP_IMM

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CMP_ZP

public static final int CMP_ZP

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CMP_ZPX

public static final int CMP_ZPX

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CMP_IZX

public static final int CMP_IZX

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CMP_IZY

public static final int CMP_IZY

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CMP_ABS

public static final int CMP_ABS

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CMP_ABSX

public static final int CMP_ABSX

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CMP_ABSY

public static final int CMP_ABSY

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CPX_IMM

public static final int CPX_IMM

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CPX_ZP

public static final int CPX_ZP

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CPX_ABS

public static final int CPX_ABS

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CPY_IMM

public static final int CPY_IMM

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CPY_ZP

public static final int CPY_ZP

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CPY_ABS

public static final int CPY_ABS

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DEC_ZP

public static final int DEC_ZP

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DEC_ZPX

public static final int DEC_ZPX

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DEC_ABS

public static final int DEC_ABS

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DEC_ABSX

public static final int DEC_ABSX

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DEX_IMP

public static final int DEX_IMP

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DEY_IMP

public static final int DEY_IMP

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EOR_IMM

public static final int EOR_IMM

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EOR_ZP

public static final int EOR_ZP

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EOR_ZPX

public static final int EOR_ZPX

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EOR_ABS

public static final int EOR_ABS

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EOR_ABSX

public static final int EOR_ABSX

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EOR_ABSY

public static final int EOR_ABSY

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EOR_IZX

public static final int EOR_IZX

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EOR_IZY

public static final int EOR_IZY

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INC_ZP

public static final int INC_ZP

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INC_ZPX

public static final int INC_ZPX

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INC_ABS

public static final int INC_ABS

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INC_ABSX

public static final int INC_ABSX

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INX_IMP

public static final int INX_IMP

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INY_IMP

public static final int INY_IMP

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JMP_ABS

public static final int JMP_ABS

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JMP_IND

public static final int JMP_IND

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JSR_ABS

public static final int JSR_ABS

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LDA_IMM

public static final int LDA_IMM

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LDA_ZP

public static final int LDA_ZP

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LDA_ZPX

public static final int LDA_ZPX

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LDA_ABS

public static final int LDA_ABS

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LDA_ABSX

public static final int LDA_ABSX

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LDA_ABSY

public static final int LDA_ABSY

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LDA_IZX

public static final int LDA_IZX

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LDA_IZY

public static final int LDA_IZY

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LDX_IMM

public static final int LDX_IMM

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LDX_ZP

public static final int LDX_ZP

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LDX_ZPY

public static final int LDX_ZPY

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LDX_ABS

public static final int LDX_ABS

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LDX_ABSY

public static final int LDX_ABSY

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LDY_IMM

public static final int LDY_IMM

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LDY_ZP

public static final int LDY_ZP

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LDY_ZPX

public static final int LDY_ZPX

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LDY_ABS

public static final int LDY_ABS

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LDY_ABSX

public static final int LDY_ABSX

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LSR_IMP

public static final int LSR_IMP

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LSR_ZP

public static final int LSR_ZP

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LSR_ZPX

public static final int LSR_ZPX

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LSR_ABS

public static final int LSR_ABS

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LSR_ABSX

public static final int LSR_ABSX

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NOP_IMP

public static final int NOP_IMP

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ORA_IMM

public static final int ORA_IMM

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ORA_ZP

public static final int ORA_ZP

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ORA_ZPX

public static final int ORA_ZPX

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ORA_IZX

public static final int ORA_IZX

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ORA_IZY

public static final int ORA_IZY

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ORA_ABS

public static final int ORA_ABS

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ORA_ABSX

public static final int ORA_ABSX

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ORA_ABSY

public static final int ORA_ABSY

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PHA_IMP

public static final int PHA_IMP

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PHP_IMP

public static final int PHP_IMP

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PLA_IMP

public static final int PLA_IMP

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PLP_IMP

public static final int PLP_IMP

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ROL_IMP

public static final int ROL_IMP

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ROL_ZP

public static final int ROL_ZP

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ROL_ZPX

public static final int ROL_ZPX

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ROL_ABS

public static final int ROL_ABS

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ROL_ABSX

public static final int ROL_ABSX

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ROR_IMP

public static final int ROR_IMP

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ROR_ZP

public static final int ROR_ZP

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ROR_ZPX

public static final int ROR_ZPX

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ROR_ABS

public static final int ROR_ABS

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ROR_ABSX

public static final int ROR_ABSX

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RTI_IMP

public static final int RTI_IMP

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RTS_IMP

public static final int RTS_IMP

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SBC_IMM

public static final int SBC_IMM

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SBC_ZP

public static final int SBC_ZP

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SBC_ZPX

public static final int SBC_ZPX

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SBC_ABS

public static final int SBC_ABS

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SBC_ABSX

public static final int SBC_ABSX

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SBC_ABSY

public static final int SBC_ABSY

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SBC_IZX

public static final int SBC_IZX

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SBC_IZY

public static final int SBC_IZY

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Constant Field Values

SEC_IMP

public static final int SEC_IMP

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SED_IMP

public static final int SED_IMP

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SEI_IMP

public static final int SEI_IMP

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STA_ZP

public static final int STA_ZP

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STA_ZPX

public static final int STA_ZPX

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STA_ABS

public static final int STA_ABS

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STA_ABSX

public static final int STA_ABSX

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STA_ABSY

public static final int STA_ABSY

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STA_IZX

public static final int STA_IZX

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STA_IZY

public static final int STA_IZY

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STX_ZP

public static final int STX_ZP

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STX_ZPY

public static final int STX_ZPY

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STX_ABS

public static final int STX_ABS

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STY_ZP

public static final int STY_ZP

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STY_ZPX

public static final int STY_ZPX

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STY_ABS

public static final int STY_ABS

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TAX_IMP

public static final int TAX_IMP

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TAY_IMP

public static final int TAY_IMP

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TSX_IMP

public static final int TSX_IMP

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TXA_IMP

public static final int TXA_IMP

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TXS_IMP

public static final int TXS_IMP

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TYA_IMP

public static final int TYA_IMP

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uLSE_ZP

public static final int uLSE_ZP

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uLSE_ZPX

public static final int uLSE_ZPX

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uLSE_IZX

public static final int uLSE_IZX

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uLSE_IZY

public static final int uLSE_IZY

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uLSE_ABS

public static final int uLSE_ABS

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uLSE_ABSX

public static final int uLSE_ABSX

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uLSE_ABSY

public static final int uLSE_ABSY

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uSAX_ZP

public static final int uSAX_ZP

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uSAX_ZPY

public static final int uSAX_ZPY

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uSAX_IZX

public static final int uSAX_IZX

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uSAX_ABS

public static final int uSAX_ABS

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Method Detail

getText

public static java.lang.String getText(int opcode)

Returns the textual representation for the passed opcode. This may contain argument slots in a java.text.MessageFormat compatible way. Note that only the lower eight bits of the passed opcode are used for lookup.

Parameters:

opcode - The opcode to decode.

Returns:

The textual representation for the passed opcode.

getEncodingLength

public static int getEncodingLength(int opcode)

Get the length that an instruction based on the passed opcode uses in memory.

Parameters:

opcode - The opcode to decode.

Returns:

The length of an instruction based on the passed opcode.

getTime

public static int getTime(int opcode)

Get the number of cycles required to execute the passed opcode.

Parameters:

opcode - The opcode.

Returns:

The number of cycles required to execute the passed instruction.

isValidOpcode

public static boolean isValidOpcode(int opcode)

Checks whether the passed opcode is valid. Valid means that this class knows a string representation for this opcode, it does not mean that it is a documented opcode.

Parameters:

opcode - The opcode to check.

Returns:

true in case the opcode can be translated into a mnemonic.