From f245d085cf1ce04009dcbc9f8dc04dcfabf1c745 Mon Sep 17 00:00:00 2001 From: WlodekM Date: Wed, 2 Apr 2025 17:18:05 +0300 Subject: more instructions --- instructions/ASL.ts | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 instructions/ASL.ts (limited to 'instructions/ASL.ts') diff --git a/instructions/ASL.ts b/instructions/ASL.ts new file mode 100644 index 0000000..1f3fcbb --- /dev/null +++ b/instructions/ASL.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.negative = (mem & 128) != 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.negative = (mem & 128) != 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