23 Aug
1999
23 Aug
'99
1:57 p.m.
<Of course no program should ever intentionally use undefined opcodes, but
<copy-protection systems often do in my experience. So it's useful if
<emulators do the Right Thing with them.
In the case of 8085 and z80 they were actually useful extensions and worth
using. Those that came to depend on them kept spcing the part to have them
and the vendors would make sure they were there.
Allison