Re: A85: Z80 Undocumented Instructions
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Re: A85: Z80 Undocumented Instructions
For the IXh and IXl instructions, you just use something like:
.db $DD / inc h ;increment IXh
.db $DD / inc l ;increment IXl
.db $FD / inc h ;increment IYh
.db $FD / inc l ;increment IYl
the opcodes are the same as for the instructions with hl, except that
the IX instructions are preceded by $DD and the IY by $FD. I am sure
all of the instructions are slow as molasses like all of the IX and IY
instructions.
-mike pearce
On Sat, 16 Aug 1997 13:35:32 -0500, you wrote:
>Michael Pearce wrote:
>>
>> Has anyone made an updated "tasm80.tab" file with the IXh, IXl, IYh,
>> and IYl instructions included?
>>
>> -mike pearce
>
>Undocumented instructions? What do you mean?!? For one thing, I
>couldn't find any IXh, IXl, IYh, or IYl instructions in the Z80 user's
>manual.. And why wouldn't Zilog document instructions? Wouldn't gain
>them anything by leaving them undocumented..
>--
>* * * * * * * * * * * * * * * * * * *
>* ~mozart <mozart@technologist.com> *
>* * * * * * * * * * * * * * * * * * *
>
References: