diff options
Diffstat (limited to 'instructions/DEC.ts')
| -rw-r--r-- | instructions/DEC.ts | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/instructions/DEC.ts b/instructions/DEC.ts new file mode 100644 index 0000000..9f14487 --- /dev/null +++ b/instructions/DEC.ts @@ -0,0 +1,10 @@ +import type The65c02 from "../65c02.ts"; + +export default function (this: The65c02, mode: string) { + const addr = this.getAddr(mode); + this.io.address.set(addr); + this.read(); + const res = this.io.data.num() - 1; + this.io.data.set(res & 0xFF); + this.flagZN(res & 0xFF) +} \ No newline at end of file |