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-rw-r--r--src/apple.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/apple.c b/src/apple.c
index 18f1763..5ef87f6 100644
--- a/src/apple.c
+++ b/src/apple.c
@@ -92,7 +92,8 @@ void SetMemory(address x, byte y){
switch(x)
{
case DSP:
- DisplayInput(y);
+ if (y & 0x80)
+ DisplayInput(y);
}
if (x < MEMORY_SIZE) {
Memory[x] = y;