Re: A86: another undoc attempt

To: assembly-86@lists.ticalc.org
Subject: Re: A86: another undoc attempt
From: Dan Eble <eble@cis.ohio-state.edu>
Date: Fri, 22 May 1998 10:22:24 -0400 (EDT)
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <3564F292.5B2B371@eden.rutgers.edu>
Reply-To: assembly-86@lists.ticalc.org

On Thu, 21 May 1998, Dux Gregis wrote:

> Ok, I think this might be an undocumented instruction:
> 
>  sll ixh
> 
> $dd,$cb,$34

Nope... that's not even a whole opcode.  $dd,$cb,nn,$34 would be 
"SL1 H,(IX+nn)", which is to say, "shift (IX+nn) left, insert one into
the low bit, and copy the answer into H".

I don't like using SLL for this instruction because normally, a "logical
left shift" would insert a 0 into the low bit.

I'll post a complete list of Z80 opcodes so you can stop wasting your time
looking for new undocumented ones.  (It should be *somewhere* on my drive) 

--------
Dan Eble (mailto:eble@cis.ohio-state.edu)
         (http://www.cis.ohio-state.edu/~eble)

"Behold, how great a matter a little fire kindleth!" -- James 3:5

References:

A86: another undoc attempt

From: Dux Gregis <assets@eden.rutgers.edu>

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