From 72ba068beb92ebc723e3fdccb9f2304c535ad340 Mon Sep 17 00:00:00 2001
From: Maik Merten <maikmerten@googlemail.com>
Date: Sat, 23 Aug 2014 16:50:34 +0200
Subject: [PATCH] mask all bits beyond bits 0 to 7 on bus reads to ensure no
 surplus bits cause unpredictable system behavior.

---
 src/main/java/com/loomcom/symon/Bus.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/com/loomcom/symon/Bus.java b/src/main/java/com/loomcom/symon/Bus.java
index 2266031..f4d4da0 100644
--- a/src/main/java/com/loomcom/symon/Bus.java
+++ b/src/main/java/com/loomcom/symon/Bus.java
@@ -170,7 +170,7 @@ public class Bus {
         if(d != null) {
             MemoryRange range = d.getMemoryRange();
             int devAddr = address - range.startAddress();
-            return d.read(devAddr);
+            return d.read(devAddr) & 0xff;
         }
         
         throw new MemoryAccessException("Bus read failed. No device at address " + String.format("$%04X", address));