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STA: Difference between revisions

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=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page on STA: https://archive.org/details/0893037893ProgrammingThe65816/page/n529
* [[Eyes & Lichty]] page 503, on STA: https://archive.org/details/0893037893ProgrammingThe65816/page/n529
* [[Labiak]] page on STA: https://archive.org/details/Programming_the_65816/page/n194
* [[Labiak]] page on STA: https://archive.org/details/Programming_the_65816/page/n194
* [[MCS6500 Manual]] page on STA: https://archive.org/details/mos_microcomputers_programming_manual/page/n20
* [[MCS6500 Manual]] page on STA: https://archive.org/details/mos_microcomputers_programming_manual/page/n20

Revision as of 04:14, 21 November 2023

Basic Info
Addressing Mode Opcode Length Speed
Absolute 8D 3 bytes 4 cycles*
absolute long 8F 4 bytes 5 cycles*
Direct Page 85 2 bytes 3 cycles*
direct page indirect 92 2 bytes 5 cycles*
direct page indirect long 87 2 bytes 6 cycles*
absolute indexed by X 9D 3 bytes 4 cycles*
absolute long indexed by X 9F 4 bytes 5 cycles*
absolute indexed by Y 99 3 bytes 4 cycles*
direct page indexed by X 95 2 bytes 4 cycles*
direct page indexed indirect by X 81 2 bytes 6 cycles*
direct page indirect indexed by Y 91 2 bytes 5 cycles*
direct page indirect long indexed by Y 97 2 bytes 6 cycles*
stack relative 83 2 bytes 4 cycles*
stack relative indirect indexed by Y 93 2 bytes 7 cycles*
Flags Affected
N V M X D I Z C
. . . . . . . .

STA (Store Accumulator) is a 65x instruction that stores the value of the accumulator. In all addressing modes, STA takes one additional cycle when the accumulator is 16 bits wide. In direct page addressing modes, STA takes another additional cycle if the low byte of the direct page register is nonzero.

See Also

External Links