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DEX: Difference between revisions
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!colspan="8"|Flags Affected | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[N Flag|N]] | ||
|V | |[[V Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[D Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Z Flag|Z]] | ||
|C | |[[C Flag|C]] | ||
|+ | |+ | ||
| | | | ||
| Line 43: | Line 43: | ||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on DEX: https://archive.org/details/0893037893ProgrammingThe65816/page/n478 | * [[Eyes & Lichty]] page 452, on DEX: https://archive.org/details/0893037893ProgrammingThe65816/page/n478 | ||
* [[Labiak]] page on DEX: https://archive.org/details/Programming_the_65816/page/n149 | * [[Labiak]] page 139 on DEX: https://archive.org/details/Programming_the_65816/page/n149 | ||
* [[MCS6500 Manual]] page 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 on DEX: https://archive.org/details/6502UsersManual/page/n271 | * [[Carr]] page 258 on DEX: https://archive.org/details/6502UsersManual/page/n271 | ||
* [[Leventhal]] page on DEX: https://archive.org/details/6502-assembly-language-programming/page/n110 | * [[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 | * snes9x implementation of DEX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1484 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] | |||
Latest revision as of 11:40, 14 December 2023
| 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.
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