SBC: Difference between revisions

Revision as of 20:46, 17 May 2023

SBC (Subtract with Carry/Borrow) is 65x instruction that performs a subtraction.


Basic Info
Addressing Mode	Opcode	Length	Speed
immediate	E9	2 bytes	2 cycles
absolute	ED	3 bytes	4 cycles
absolute long	EF	4 bytes	5 cycles
direct page	E5	2 bytes	3 cycles
direct page indirect	F2	2 bytes	5 cycles
direct page indirect long	E7	2 bytes	6 cycles
absolute indexed by X	FD	3 bytes	4 cycles
absolute long indexed by X	FF	4 bytes	5 cycles
absolute indexed by Y	F9	3 bytes	4 cycles
direct page indexed by X	F5	2 bytes	4 cycles
direct page indirect indexed by X	E1	2 bytes	6 cycles
direct page indirect indexed by Y	F1	2 bytes	5 cycles
direct page indirect long indexed by Y	F7	2 bytes	6 cycles
stack relative	E3	2 bytes	4 cycles
stack relative indirect indexed by Y	F3	2 bytes	7 cycles


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

@@ Line 116: / Line 116: @@
 * [[Carr]] page on SBC: https://archive.org/details/6502UsersManual/page/n284
 * [[Leventhal]] page on SBC: https://archive.org/details/6502-assembly-language-programming/page/n140
+* snes9x implementation of SBC: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1133
 [[Category:ASM]]
 [[Category:Group One Instructions]]
 [[Category:Inherited from 6502]]