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ORA: Difference between revisions

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* [[Eyes & Lichty]] page on ORA: https://archive.org/details/0893037893ProgrammingThe65816/page/n497
* [[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
* [[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


[[Category:ASM]]
[[Category:ASM]]
[[Category:Group One Instructions]]
[[Category:Group One Instructions]]
[[Category:Inherited from 6502]]
[[Category:Inherited from 6502]]

Revision as of 03:37, 16 May 2023

ORA is a 65x instruction that performs a logical OR.

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
. . . . . .

See Also

External Links