1 files changed, 6 insertions, 4 deletions
diff --git a/instructions/ADC.ts b/instructions/ADC.ts
index c8163d0..5e00f15 100644
--- a/instructions/ADC.ts
+++ b/instructions/ADC.ts
@@ -1,9 +1,11 @@
 import type The65c02 from "../65c02.ts";
 
 export default function (this: The65c02, mode: string) {
-    const addr = this.getAddr(mode);
+    const addr = this.getAddr(mode)
     this.io.address.set(addr);
-    this.read();
-    this.flagZN(this.io.data.num())
-    this.regA.set(this.io.data.num())
+    this.read()
+    const mem = this.io.data.num();
+    const result = this.regA.num() + mem
+    this.flagZCN(result);
+    this.regA.set(result & 0xFF);
 }
\ No newline at end of file