diff options
Diffstat (limited to 'instructions/DEX.ts')
| -rw-r--r-- | instructions/DEX.ts | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/instructions/DEX.ts b/instructions/DEX.ts new file mode 100644 index 0000000..f5452e8 --- /dev/null +++ b/instructions/DEX.ts @@ -0,0 +1,8 @@ +import type The65c02 from "../65c02.ts"; + +export default function (this: The65c02) { + const res = this.regX.num() - 1; + this.regX.set(res & 0xFF); + this.flagZN(res & 0xFF); + this.programCounter.increment(); +} \ No newline at end of file |