• utz
  • utz
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  • Registered: 2015-06-28
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Topic: outi

Encountered something strange a while ago. It seems that on ZX Spectrum the carry flag is reset after OUTI (and possibly OUTD). However, in documentation both official and unofficial, it is claimed that OUTI has no effect on the carry flag. Is this a special "feature" of the Z80 used in the Speccy, or is the documentation incorrect?

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  • From: London
  • Registered: 2015-06-29
  • Posts: 66

Re: outi

I think you need to read section 4.3 of this document: http://www.z80.info/zip/z80-documented.pdf

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  • utz
  • utz
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Re: outi

Gnnnnrrrrr! There goes my wonderful plan for a new 256b sample engine... yikes

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