We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS

STA: Difference between revisions

From SnesLab
Jump to: navigation, search
(→‎External Links: de n'd page number)
(→‎External Links: hid archive URL)
Line 134: Line 134:
=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page 503, on STA: https://archive.org/details/0893037893ProgrammingThe65816/page/503
* [[Eyes & Lichty]] page 503, on STA: https://archive.org/details/0893037893ProgrammingThe65816/page/503
* [[Labiak]] page 184 on STA: https://archive.org/details/Programming_the_65816/page/n194
* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n194 page 184] on STA
* [[MCS6500 Manual]] page 5 on STA: https://archive.org/details/mos_microcomputers_programming_manual/page/n20
* [[MCS6500 Manual]] page 5 on STA: https://archive.org/details/mos_microcomputers_programming_manual/page/n20
* [[Carr]] page 273 on STA: https://archive.org/details/6502UsersManual/page/n286
* [[Carr]] page 273 on STA: https://archive.org/details/6502UsersManual/page/n286

Revision as of 04:32, 6 August 2024

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. If the accumulator is 16 bits wide, its low byte is stored at the effective address and its high byte is stored at the effective address plus one.

No flags are affected.

Syntax

STA addr
STA long
STA dp
STA (dp)
STA [dp]
STA addr, X
STA long, X
STA addr, Y
STA dp, X
STA (dp, X)
STA (dp), Y
STA [dp], Y
STA sr, S
STA (sr, S), Y
Cycle Penalties

See Also

External Links