=== Illegal instructions ===
The opcodes Opcodes in red are unstable. Only 2 of those 7 opcodes ($8B, $AB) are actually unstable in the sense that they may produce a truly unpredictable result. The other 5 opcodes actually produce predictable results – but the conditions under which they do that and the produced results are a bit unexpected.
{| class="wikitable" style="white-space: nowrap;"