1 files changed, 30 insertions, 3 deletions
diff --git a/instruction.h b/instruction.h
index af48ba0..054e629 100644
--- a/instruction.h
+++ b/instruction.h
@@ -27,9 +27,36 @@ void fSTY(Addressing addr, int val){
 	Memory[(fAddressing(addr, val))] = Y;
 }
 
+// Arithmetic Instructions
 
+void fADC(Addressing addr, int val){
+	int buffer = acc + fAddressing(addr, val);
+	setFlagV(buffer, acc);
 
-// Arithmetic Instructions
+	if (buffer > 255){
+		setFlag(flag_C, 1);
+	}else{
+		setFlag(flag_C, 0);
+	}
+
+	acc += fAddressing(addr, val);
+	setFlagN(acc);
+	setFlagZ(acc);
+}
+
+void fSBC(Addressing addr, int val){
+	int buffer = acc - fAddressing(addr, val);
+	setFlagV(buffer, acc);
+
+	if (buffer < 0){
+		setFlag(flag_C, 1);
+	}else{
+		setFlag(flag_C, 0);
+	}
+	acc -= fAddressing(addr, val);
+	setFlagN(acc);
+	setFlagZ(acc);
+}
 
 //Increment and Decrement Instructions
 
@@ -52,7 +79,7 @@ void fORA(Addressing addr, int val){
 
 void fEOR(Addressing addr, int val){
 	acc = acc ^ fAddressing(addr, val);
-	setFlagN();
+	setFlagN(acc);
 	setFlagZ(acc);
 }
 
@@ -67,7 +94,7 @@ void fEOR(Addressing addr, int val){
 void fASL(Addressing addr, int val){
 	setFlag(flag_C, (val & 0x80));
 	acc = (val << 1);
-	setFlagN();
+	setFlagN(acc);
 	setFlagZ(acc);
 }