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-rwxr-xr-xnandgame/assembler/createbin.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/nandgame/assembler/createbin.py b/nandgame/assembler/createbin.py
index d4a2e7a..3713389 100755
--- a/nandgame/assembler/createbin.py
+++ b/nandgame/assembler/createbin.py
@@ -11,4 +11,8 @@ with open("allins.bin", "wb") as f:
f.write(ins.to_bytes(2))
for ins in range(0x8000, 0xffff + 1):
+ # unused bytes, force 1
+ if (ins & 0x6800) != 0x6800:
+ continue
+
f.write(ins.to_bytes(2))