diff --git a/src/rom.rs b/src/rom.rs
index ef5c2f8..b65bbd4 100644
--- a/src/rom.rs
+++ b/src/rom.rs
@@ -81,8 +81,8 @@ impl Card for Rom {
         match address {
             (0..=0xEF) => NullableResult::Ok(self.ram[address as usize]),
             (0xF0..=0xF1) => NullableResult::Ok(u16_get_be_byte(self.start, address - 0xF0)),
-            0xF2 => NullableResult::Ok(self.enabled as u8),
-            (0xFE..=0xFF) => NullableResult::Ok(u16_get_be_byte(ID, address - 0xFE)),
+            0xF3 => NullableResult::Ok(self.enabled as u8),
+            (0xFE..=0xFF) => NullableResult::Ok(u16_get_be_byte(0x1, address - 0xFE)),
             _ => NullableResult::Null,
         }
     }
@@ -95,7 +95,7 @@ impl Card for Rom {
             (0xF0..=0xF1) => {
                 self.start = u16_set_be_byte(self.start, address - 0xF0, data);
             }
-            0xF2 => {
+            0xF3 => {
                 self.enabled = data > 0;
             }
             _ => (),