- Joined: 18 Sep 1999
- Posts: 498
- Location: Portland, Oregon USA
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Undocumented Z80 Instructions
 Posted: Mon Aug 07, 2000 5:02 pm
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Have any of you SMS/GG emulator authors encountered any undocumented Z80 opcodes in commercial SMS or GG software?
If so, which ones? Specifically, I'm curious about opcodes in of the [ED D?] area.
Thanks.
Eric Quinn
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vecna
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Posted: Tue Aug 08, 2000 5:37 am
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Quote > Have any of you SMS/GG emulator authors encountered any undocumented Z80 opcodes in commercial SMS or GG software?
> If so, which ones? Specifically, I'm curious about opcodes in of the [ED D?] area.
I don't think any of the major SMS emus have custom Z80 cores.. but most of the standard cores emulate a majority of undocumented functions (or the most common ones anyway), so it's tough to say. It might be worth doing, but basically we'd have to trap those specific opcodes and then playtest a whole crapload of games to find out...
- vecna
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