STA: Difference between revisions

Revision as of 20:48, 17 May 2023

STA (Store Accumulator) is a 65x instruction that stores the value of the accumulator.


Basic Info
Addressing Mode	Opcode	Length	Speed
absolute	8D	3 bytes	4 cycles
absolute long	8F	4 bytes	5 cycles
direct page	85	2 bytes	3 cycles
direct page indirect	92	2 bytes	5 cycles
direct page indirect long	87	2 bytes	6 cycles
absolute indexed by X	9D	3 bytes	4 cycles
absolute long indexed by X	9F	4 bytes	5 cycles
absolute indexed by Y	99	3 bytes	4 cycles
direct page indexed by X	95	2 bytes	4 cycles
direct page indexed indirect by X	81	2 bytes	6 cycles
direct page indirect indexed by Y	91	2 bytes	5 cycles
direct page indirect long indexed by Y	97	2 bytes	6 cycles
stack relative	83	2 bytes	4 cycles
stack relative indirect indexed by Y	93	2 bytes	7 cycles


Flags Clobbered
N	V	M	X	D	I	Z	C
.	.	.	.	.	.	.	.

@@ Line 113: / Line 113: @@
 * [[Carr]] page on STA: https://archive.org/details/6502UsersManual/page/n286
 * [[Leventhal]] page on STA: https://archive.org/details/6502-assembly-language-programming/page/n145
+* snes9x implementation of STA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1219
 [[Category:ASM]]
 [[Category:Group One Instructions]]
 [[Category:Inherited from 6502]]