From 9c6de724cc3d37c0af09a1f902546d3f261ee53a Mon Sep 17 00:00:00 2001
From: uvok
Date: Sun, 4 Jan 2026 18:22:01 +0100
Subject: createbin: avoid reserved bits

skip in loop, to avoid duplicates
---
 nandgame/assembler/createbin.py | 4 ++++
 1 file changed, 4 insertions(+)

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))
-- 
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