diff --git a/NORFlasherFirmware.ino b/NORFlasherFirmware.ino
index 3e8ee73..c6f1584 100644
--- a/NORFlasherFirmware.ino
+++ b/NORFlasherFirmware.ino
@@ -6,7 +6,8 @@ enum {
   CMD_INVALID,
   CMD_WRITE,
   CMD_TEST,
-  CMD_DUMP
+  CMD_DUMP,
+  CMD_ERASE
 };
 
 char line[120];
@@ -32,7 +33,7 @@ void setup() {
   setCtrlPins();
 
   setAddrPinsOut();
-  setDataPinsIn();
+  setDataPinsOut();
   //setDataPinsOut();
 
   Serial.begin(9600, SERIAL_8N1);
@@ -84,6 +85,7 @@ byte parseCommand(char c) {
     case 'w': cmd = CMD_WRITE; break;
     case 't': cmd = CMD_TEST; break;
     case 'd': cmd = CMD_DUMP; break;
+    case 'e': cmd = CMD_ERASE; break;
     default: cmd = CMD_INVALID; break;
   }
 
@@ -122,7 +124,7 @@ void loop() {
       Serial.println("Wrote: 0x3F");
       setDataPinsIn();
       delay(500);
-      Serial.println("Received: ");
+      Serial.print("Received: ");
       Serial.println(readData(0x0000), HEX);
       cmd = NULL;
       break;
@@ -136,6 +138,10 @@ void loop() {
       // }
       cmd = NULL;
       break;
+    case CMD_ERASE:
+      eraseROM();
+      cmd = NULL;
+      break;
 
     case CMD_INVALID:
     default:
@@ -144,6 +150,8 @@ void loop() {
       Serial.println("Commands: ");
       Serial.println("w\twrite new firmware");
       Serial.println("d\tdump firmware");
+      Serial.println("t\tdo a test write and then read");
+      Serial.println("e\terase chip");
       Serial.println();
       break;
   }
@@ -154,4 +162,18 @@ void dumpROM() {
     byte data = readData(0x0000 | i);
     Serial.println(data, HEX);
   }
+}
+
+void eraseROM() {
+  setDataPinsOut();
+
+  writeByte(0xAA, 0x5555);
+  writeByte(0x55, 0x2AAA);
+  writeByte(0x80, 0x5555);
+  writeByte(0xAA, 0x5555);
+  writeByte(0x55, 0x2AAA);
+  writeByte(0x10, 0x5555);
+
+  delay(100);
+  setDataPinsIn();
 }
\ No newline at end of file