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ORA: Difference between revisions

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* [[MCS6500 Manual]] page on ORA: https://archive.org/details/mos_microcomputers_programming_manual/page/n36
* [[MCS6500 Manual]] page on ORA: https://archive.org/details/mos_microcomputers_programming_manual/page/n36
* [[Carr]] page on ORA: https://archive.org/details/6502UsersManual/page/n279
* [[Carr]] page on ORA: https://archive.org/details/6502UsersManual/page/n279
* [[Leventhal]] page on ORA: https://archive.org/details/6502-assembly-language-programming/page/n128
* [[Leventhal]] page 3-79 on ORA: https://archive.org/details/6502-assembly-language-programming/page/n128
* snes9x implementation of ORA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L917
* snes9x implementation of ORA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L917
* undisbeliever on ORA: https://undisbeliever.net/snesdev/65816-opcodes.html#ora-or-accumulator-with-memory
* undisbeliever on ORA: https://undisbeliever.net/snesdev/65816-opcodes.html#ora-or-accumulator-with-memory

Revision as of 10:36, 4 December 2023

Basic Info
Addressing Mode Opcode Length Speed
Immediate 09 2 bytes 2 cycles*
Absolute 0D 3 bytes 4 cycles*
Absolute Long 0F 4 bytes 5 cycles*
Direct Page 05 2 bytes 3 cycles*
Direct Page Indirect 12 2 bytes 5 cycles*
Direct Page Indirect Long 07 2 bytes 6 cycles*
absolute indexed by X 1D 3 bytes 4 cycles*
absolute long indexed by X 1F 4 bytes 5 cycles*
absolute indexed by Y 19 3 bytes 4 cycles*
direct page indexed by X 15 2 bytes 4 cycles*
direct page indexed indirect by X 01 2 bytes 6 cycles*
direct page indirect indexed by Y 11 2 bytes 5 cycles*
direct page indirect long indexed by Y 17 2 bytes 6 cycles*
Stack Relative 03 2 bytes 4 cycles*
stack relative indirect indexed by Y 13 2 bytes 7 cycles*
Flags Affected
N V M X D I Z C
. . . . . .

ORA is a 65x instruction that performs a logical OR and stores the result in the accumulator.

Cycle Penalties

See Also

External Links