K65 Instructions

Standard 6502 opcodes
Opcode	Description	K65 Syntax
		Acc	Implied	Imm	Mem	Mem,X	Mem,Y	(Mem,X)	(Mem),Y	(Mem)
ADC	add with carry			a+imm	a+mem	a+mem,x	a+mem,y	a+(mem,x)	a+(mem),y
AND	and (with accumulator)			a&imm	a&mem	a&mem,x	a&mem,y	a&(mem,x)	a&(mem),y
ASL	arithmetic shift left	a<<			mem<<	mem,x<<
BCC	branch on carry clear	>={ ... }   or   < goto label   or   { ... } <   or   c+{ ... }   or   c- goto label   or   { ... } c-
BCS	branch on carry set	<{ ... }   or   >= goto label   or   { ... } >=   or   c-{ ... }   or   c+ goto label   or   { ... } c+
BEQ	branch on equal (zero set)	{ ... }   or   == goto label   or   { ... } ==
BIT	bit test				a?mem
BMI	branch on minus (negative set)	>=0{ ... }   or   <0 goto label   or   { ... } <0
BNE	branch on not equal (zero clear)	=={ ... }   or   != goto label   or   { ... } !=
BPL	branch on plus (negative clear)	<0{ ... }   or   >=0 goto label   or   { ... } >=0
BRK	interrupt		TBD
BVC	branch on overflow clear	<<={ ... }   or   >>= goto label   or   { ... } >>=   or   o+{ ... }   or   o- goto label   or   { ... } o-
BVS	branch on overflow set	>>={ ... }   or   <<= goto label   or   { ... } <<=   or   o-{ ... }   or   o+ goto label   or   { ... } o+
CLC	clear carry		c-
CLD	clear decimal		d-
CLI	clear interrupt disable		i-
CLV	clear overflow		o-
CMP	compare (with accumulator)			a?imm	a?mem	a?mem,x	a?mem,y	a?(mem,x)	a?(mem),y
CPX	compare with X			x?imm	x?mem
CPY	compare with Y			y?imm	y?mem
DEC	decrement				mem--	mem,x--
DEX	decrement X		x--
DEY	decrement Y		y--
EOR	exclusive or (with accumulator)			a^imm	a^mem	a^mem,x	a^mem,y	a^(mem,x)	a^(mem),y
INC	increment				mem++	mem,x++
INX	increment X		x++
INY	increment Y		y++
JMP	jump				goto mem					goto (mem)
JSR	jump subroutine				call mem
LAS
LDA	load accumulator			a=imm	a=mem	a=mem,x	a=mem,y	a=(mem,x)	a=(mem),y
LDX	load X			x=imm	x=mem		x=mem,y
LDY	load Y			y=imm	y=mem	y=mem,x
LSR	logical shift right	a>>			mem>>	mem,x>>
NOP	no operation	* (for single NOP)   or   *<number> (to wait <number> of cycles)
ORA	or with accumulator			imm	mem	mem,x	mem,y	(mem,x)	(mem),y
PHA	push accumulator		a!!
PHP	push processor status (SR)		flag!!
PLA	pull accumulator		a??
PLP	pull processor status (SR)		flag??
ROL	rotate left	a<<<			mem<<<	mem,x<<<
ROR	rotate right	a>>>			mem>>>	mem,x>>>
RRA
RTI	return from interrupt		TBD
RTS	return from subroutine		return
SBC	subtract with carry			a-imm	a-mem	a-mem,x	a-mem,y	a-(mem,x)	a-(mem),y
SEC	set carry		c+
SED	set decimal		d+
SEI	set interrupt disable		i-
STA	store accumulator				mem=a	mem,x=a	mem,y=a	(mem,x)=a	(mem),y=a
STX	store X				mem=x
STY	store Y				mem=y
TAX	transfer accumulator to X		x=a
TAY	transfer accumulator to Y		y=a
TSX	transfer stack pointer to X		x=s
TXA	transfer X to accumulator		a=x
TXS	transfer X to stack pointer		s=x
TYA	transfer Y to accumulator		a=y

Undocumented 6502 opcodes
Opcode	Description	K65 Syntax
		Acc	Implied	Imm	Mem	Mem,X	Mem,Y	(Mem,X)	(Mem),Y	(Mem)
ANC	A <- A & imm, C <- bit 7			a&.imm
ARR	A <- (A & imm) ror>>>			TBD
ASR	A <- (A & imm) >> 1			TBD
AXS	X <- (A & X) - imm   (no borrow)			x&=a-imm
DCP	decrement mem, then compare Acc to mem				a?--mem	a?--mem,x	a?--mem,y	a?--(mem,x)	a?--(mem),y
ISC	increment mem, then subtract mem from Acc (with borrow)				a - ++mem	a - ++mem,x	a - ++mem,y	a - ++(mem,x)	a - ++(mem),y
LAX	load to Acc and X				a=x=mem		a=x=mem,y	a=x=(mem,x)	a=x=(mem),y
RLA	mem <- mem <<<, A <- A & mem				TBD	TBD	TBD	TBD	TBD
SAX	mem = A & X				mem=a&x			(mem,x)=a&x
SLO	mem <- mem << 1, A <- A | mem				TBD	TBD	TBD	TBD	TBD
SRE	mem <- mem >> 1, A <- A ^ mem				TBD	TBD	TBD	TBD	TBD