1 files changed, 11 insertions, 0 deletions
diff --git a/instructions/SBC.ts b/instructions/SBC.ts
new file mode 100644
index 0000000..b6840fb
--- /dev/null
+++ b/instructions/SBC.ts
@@ -0,0 +1,11 @@
+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 mem = this.io.data.num();
+    const result = this.regA.num() - mem - (1-+this.carry)
+    this.flagZCN(result);
+    this.regA.set(result & 0xFF);
+}
\ No newline at end of file