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ORA: Difference between revisions
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Revision as of 03:28, 13 July 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 Clobbered | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | ||
ORA is a 65x instruction that performs a logical OR.
See Also
External Links
- Eyes & Lichty page on ORA: https://archive.org/details/0893037893ProgrammingThe65816/page/n497
- Labiak page on ORA: https://archive.org/details/Programming_the_65816/page/n166
- 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
- Leventhal page 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
- undisbeliever on ORA: https://undisbeliever.net/snesdev/65816-opcodes.html#ora-or-accumulator-with-memory