From cec2dc2b9f2598cdf341627fe2ab91c37d637eac Mon Sep 17 00:00:00 2001 From: WlodekM Date: Wed, 2 Apr 2025 21:12:13 +0300 Subject: yea --- instructions/ROL.ts | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 instructions/ROL.ts (limited to 'instructions/ROL.ts') diff --git a/instructions/ROL.ts b/instructions/ROL.ts new file mode 100644 index 0000000..c76ef8b --- /dev/null +++ b/instructions/ROL.ts @@ -0,0 +1,21 @@ +import type The65c02 from "../65c02.ts"; + +export default function (this: The65c02, mode: string) { + if (mode == 'implicit') { + const mem = this.regA.num(); + const result = (mem << 1) | +this.carry; + this.negative = (result & 256) != 0 + this.carry = (mem & 256) != 0 + this.regA.set(result & 0xFF); + } else { + const addr = this.getAddr(mode) + this.io.address.set(addr); + this.read() + const mem = this.io.data.num(); + const result = (mem << 1) | +this.carry; + this.negative = (result & 256) != 0 + this.carry = (mem & 256) != 0 + this.io.data.set(result & 0xFF); + this.write() + } +} \ No newline at end of file -- cgit 1.4.1-2-gfad0