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

ADC: Difference between revisions

From SnesLab
Jump to: navigation, search
(linkify flags)
(→‎External Links: Labiak page number)
Line 114: Line 114:
=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page 423, on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449
* [[Eyes & Lichty]] page 423, on ADC: https://archive.org/details/0893037893ProgrammingThe65816/page/n449
* [[Labiak]] page on ADC: https://archive.org/details/Programming_the_65816/page/n125
* [[Labiak]] page 115 on ADC: https://archive.org/details/Programming_the_65816/page/n125
* [[MCS6500 Manual]] page on ADC: https://archive.org/details/mos_microcomputers_programming_manual/page/n22
* [[MCS6500 Manual]] page on ADC: https://archive.org/details/mos_microcomputers_programming_manual/page/n22
* [[Carr]] page on ADC: https://archive.org/details/6502UsersManual/page/n257
* [[Carr]] page on ADC: https://archive.org/details/6502UsersManual/page/n257

Revision as of 10:30, 27 November 2023

Basic Info
Addressing Mode Opcode Length Speed
Immediate 69 2 bytes 2 cycles*
Absolute 6D 3 bytes 4 cycles*
Absolute Long 6F 4 bytes 5 cycles*
Direct Page 65 2 bytes 3 cycles*
Direct Page Indirect 72 2 bytes 5 cycles*
Direct Page Indirect Long 67 2 bytes 6 cycles*
absolute indexed by X 7D 3 bytes 4 cycles*
absolute long indexed by X 7F 4 bytes 5 cycles*
absolute indexed by Y 79 3 bytes 4 cycles*
direct page indexed by X 75 2 bytes 4 cycles*
direct page indexed indirect by X 61 2 bytes 6 cycles*
direct page indirect indexed by Y 71 2 bytes 5 cycles*
direct page indirect long indexed by Y 77 2 bytes 6 cycles*
Stack Relative 63 2 bytes 4 cycles*
stack relative indirect indexed by Y 73 2 bytes 7 cycles*
Flags Affected
N V M X D I Z C
. . . .

ADC (Add with Carry) is 65x instruction that performs an addition. As there is no add-without-carry instruction, a CLC should be run (or the carry flag otherwise ensured to be clear) before an ADC, or else the sum will be one greater than expected.

See Also

External Links