diff --git a/src/main.rs b/src/main.rs
index 37514c9..b7f3d4f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -103,7 +103,7 @@ impl Memory {
             0x0..0x8000 => {
                 // rom access
                 // todo - switchable rom banks
-                if self.bootrom_enabled && (address as usize) < self.bootrom.len() {
+                if self.bootrom_enabled && ((address as usize) < self.bootrom.len()) {
                     return self.bootrom[address as usize];
                 } else {
                     return self.rom[address as usize];
@@ -126,6 +126,9 @@ impl Memory {
                 return 0x0;
             }
             0xFF00..0xFF4C => {
+                if address == 0xFF00 {
+                    return 0xFF;
+                }
                 return self.io[(address - 0xFF00) as usize];
             }
             0xFF4C..0xFF80 => {