opcodes.txt

Opcode	Hex	Params	Addr Mode	Description

;ADC
ADC	61	i+x	zp	Add value from zerop+X address
ADC	65	zp	zp	Add value at zp address
ADC	69	v	#	Add value to A register
ADC	6D	a	a	Add value at address
ADC	71	i,y	zp	Load zp address, add y, then add value at result addr

;SBC
SBC	E5	zp	zp	Subtract value at zp
SBC	E9	v	#	Subtract value from A
SBC	ED	a	a	Subtract valule at address
SBC	F1	i,y	zp	Load zp address, add y, then subtract value at result addr

;AND
AND	21	i+x	zp	AND value from zerop+X addr
AND	25	zp	zp	AND value at zp addr
AND	29	v	#	AND value with A register
AND	2D	a	a	AND value at addr
AND	31	i,y	zp	Load zp address, add y, then add value at result addr

;ORA
ORA	01	i+x	zp	OR value from zerop+X address
ORA	05	zp	zp	OR value from zp
ORA	09	v	#	OR value with A register
ORA	0D	a	a	OR value from address
ORA	11	i,y	zp	Load zp address, add y to that, then OR value at result addr

;EOR
ERO	45	zp	zp	XOR with value at zp
EOR	49	v	#	XOR value with A register
EOR	4D	a	a	XOR with value at address
EOR	55	zp,x	zp	XOR with value at zp+x
EOR	59	a,y	a	XOR with value at addr+y
EOR	5D	a,x	a	XOR with value at addr+x
EOR	51	i,y	zp	Load value at zp, add y, then XOR with value at that address

;Rotate (ROL/ROR)
ROL	26	zp	zp	Rotate left at zp
ROL	2A	n	n	Rotate accumulator left
ROL	2E	a	a	Rotate address left
ROR	66	zp	zp	Rotate right at zp
ROR	6A	n	n	Rotate accumulator right
ROR	6E	a	a	Rotate address right

;Shift
ASL	0A	n	#	Shift A register left
LSR	4A	n	n	Shift A register right
LSR	46	zp	zp	Shift value at zp right
LSR	4E	a	a	Shift value at address right

;INC
INC	E6	zp	zp	Increment value at zp
INC	EE	a	a	Increment value at address
INC	F6	zp,x	zp	Increment value at zp+x
INC	FE	a,x	a	Increment valuat at address+x

;DEC
DEC	C6	zp	zp	Increment value at zp
DEC	CE	a	a	Increment value at address
DEC	D6	zp,x	zp	Increment value at zp+x
DEC	DE	a,x	a	Increment valuat at address+x

;BIT 
BIT	24	zp	zp	Sets N and V flags to bits 7 and 6 of zp
BIT	2C	a	a	Sets N and V flags to bits 7 and 6 of addr

;Branch
BPL	10	l	r	Jump to label if plus result
BMI	30	l	r	Jump to label if minus result
BVC	50	l	r	Jump to label on overflow clear
BVS	70	l	r	Jump to label on overflow set
BCC	90	l	r	Jump to label on carry clear
BCS	B0	l	r	Jump to label on carry set
BNE	D0	l	r	Jump to label if Z flag is 0
BEQ	F0	l	r	Jump to label if Z flag is 1

;CMP
CMP	C5	zp	zp	Compare with value at zp
CMP	C9	v	#	Compare value to A register
CMP	CD	a	a	Compare with value at addr

;CPX
CPX	E0	v	#	Compare X with value, Z=1 if equal
CPX	E4	zp	zp	Compare X with value at zp
CPX	EC	a	a	Compare X with value at addr

;CPY
CPY	C0	v	#	Compare Y to value
CPY	C4	zp	zp	Compare Y with value at zp
CPY	CC	a	a	Compare Y with value at addr

;LDA
LDA	A1	i+x	zp	Load value from zerop+X address into Y
LDA	A5	zp	zp	Load value at zerop into A
LDA	A9	v	#	Load value into A
LDA	AD	a	a	Load value at address into A
LDA	B1	i,y	zp	Load address from zerop, add y to it, then load that addr into A
LDA	B5	zp,x	zp	Load value at zp+X into A 
LDA	B9	a,y	a	Load value at address+y into A
LDA	BD	a,x	a	Load value at address+x into A

;LDX
LDX	A2	v	#	Load value into X
LDX	A6	zp	zp	Load value at zerop into X
LDX	AE	a	a	Load value at address
LDX	B6	i,y	zp	Load value at zp, add y, then load that address
LDX	BE	a,y	a	Load value at address+Y

;LDY
LDY	A0	v	#	Load value into Y
LDY	A4	zp	zp	Load value at zerop into Y
LDY	AC	a	a	Load value at address
LDY	B4	i,y	zp	Load value at zp, add y, then load that address
LDY	BC	a,y	a	Load value at address+Y

;Registers
DEY	88	n	i	Decrement Y
TXA	8A	n	i	Transfer X to A
TYA	98	n	i	Transfer Y to A
TAY	A8	n	i	Transfer A to Y
TAX	AA	n	i	Transfer A to X
INY	C8	n	i	Increment Y
DEX	CA	n	i	Decrement X
INX	E8	n	i	Increment X

;JMP
JMP	4C	l	a	Jump to label
JMP	6C	i	a	Jump to the address at the argument address.
JSR	20	l	a	Jump to subroutine (at label)

;Returns
RTI	40	n	s	Return from interrupt
RTS	60	n	s	Return from subroutine

;Stack
PHA	48	n	s	Push A to stack ($0100-$01FF, starting from FF)
PHP	08	n	s	Push status to the stack
PLP	28	n	s	Pull status from stack
PLA	68	n	s	Pull off stack to A

;Flags
CLC	18	n	#	Clear carry
SEC	38	n	#	Set carry
CLI	58	n	#	Clear interrupt
SEI	78	n	#	Set interrupt
CLV	B8	n	#	Clear overflow
CLD	D8	n	#	Clear decimal
SED	F8	n	#	Set decimal

;STA
STA	85	zp	zp	Store A to zp
STA	8D	a	a	Store A at address
STA	95	zp,x	zp	Store A to zp+x
STA	99	a,y	a	Store A in address+Y
STA	9D	a,x	a	Store A in address+X

;STX
STX	86	zp	zp	Store X at zp
STX	8E	a	a	Store X at address
STX	96	zp,y	zp	Store X t zp+y

;STY
STY	84	zp	zp	Store Y at zp
STY	8C	a	a	Store Y at address
STY	94	zp,x	zp	Store Y at zp+x

;Misc
BRK	00	n	s	Halt
NOP	EA	n	i	No operation