Re: A86: batt checker


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Re: A86: batt checker




> >are you saying that you can do in and out with all registers? that's really
> >useful.  don't see why zilog kept everyone in the dark about this stuff.
> 
> They probably either didn't think it was useful, or didn't know about it.
...

Another explanation:  Zilog has gauranteed the opcode compatibility
between several of their chips, including the Z80 and Z180(?).  When
they make little improvements to the Z80 but don't do the same to the
other chips in the same family, they can't 'officially' release
information on those opcodes.  There are quite a few of these
undocumented opcodes...


References: