On Sat, Jun 21, 2025 at 11:29:52PM -0700, Leonard D Woren wrote:
> Note however that the only opcode more or less guaranteed to be invalid
> forever, per PoP, is x'00'.
> 
> /Leonard

I like:

        EX      0,*

Which causes an 0C3 execute exception.  An 0C1 might be a bug
but an 0C3 is most likely a "this should never happen".

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