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ORA: Difference between revisions

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'''ORA''' is a 65x instruction that performs a logical OR.  In all [[addressing modes]], ORA takes one extra cycle when the accumulator is 16 bits wide.
'''ORA''' is a 65x instruction that performs a logical OR.  In all [[addressing modes]], ORA takes one extra cycle when the accumulator is 16 bits wide.  In [[direct page addressing]] modes, ORA takes another extra cycle if the low byte of the [[direct page register]] is nonzero.


=== See Also ===
=== See Also ===

Revision as of 00:22, 20 November 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. In all addressing modes, ORA takes one extra cycle when the accumulator is 16 bits wide. In direct page addressing modes, ORA takes another extra cycle if the low byte of the direct page register is nonzero.

See Also

External Links

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