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DEX: Difference between revisions
From SnesLab
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/452 page 452] on DEX | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/452 page 452] on DEX | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n149 page 139] on DEX | ||
* [[MCS6500 Manual]] page 98 on DEX: https://archive.org/details/mos_microcomputers_programming_manual/page/n116 | * [[MCS6500 Manual]] page 98 on DEX: https://archive.org/details/mos_microcomputers_programming_manual/page/n116 | ||
* [[Carr]] page 258 on DEX: https://archive.org/details/6502UsersManual/page/n271 | * [[Carr]] page 258 on DEX: https://archive.org/details/6502UsersManual/page/n271 | ||
Revision as of 12:24, 8 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | CA | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| N | . | . | . | . | . | Z | . |
DEX is a 65x instruction that decrements the X index register by one. DEX ignores the decimal flag.
Syntax
DEX
See Also
External Links
- Eyes & Lichty, page 452 on DEX
- Labiak, page 139 on DEX
- MCS6500 Manual page 98 on DEX: https://archive.org/details/mos_microcomputers_programming_manual/page/n116
- Carr page 258 on DEX: https://archive.org/details/6502UsersManual/page/n271
- Leventhal page 3-61 on DEX: https://archive.org/details/6502-assembly-language-programming/page/n110
- snes9x implementation of DEX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1484
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.1.1.3