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DEX: Difference between revisions
From SnesLab
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'''DEX''' is a 65x instruction that decrements the [[X index register]] by one. | '''DEX''' is a 65x instruction that decrements the [[X index register]] by one. DEX ignores the [[decimal flag]]. | ||
=== See Also === | === See Also === | ||
Revision as of 22:17, 27 June 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 |
| . | . | . | . | . | . | ||
DEX is a 65x instruction that decrements the X index register by one. DEX ignores the decimal flag.
See Also
External Links
- Eyes & Lichty page 452, on DEX: https://archive.org/details/0893037893ProgrammingThe65816/page/n478
- Labiak page 139 on DEX: https://archive.org/details/Programming_the_65816/page/n149
- 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