Re: A86: RLD & RRD

To: "TI-86 Assembly Mailing List (E-mail)" <assembly-86@lists.ticalc.org>
Subject: Re: A86: RLD & RRD
From: Dan Eble <eble@cis.ohio-state.edu>
Date: Sat, 27 Sep 1997 13:09:08 -0400 (EDT)
In-Reply-To: <01BCCB50.D39F83C0@isdn-a207.itea.unit.no>
Reply-To: assembly-86@lists.ticalc.org

On Sat, 27 Sep 1997, Martin Blix Grydeland wrote:

> Any information about how these (RLD & RRD) two roll routines work would
> be appreciated. It's got something to do with (HL)???

They rotate a 12-bit operand by 4 bits.  The high 4 bits of the operand
are the low 4 bits of register A, and the low 8 bits of the are in
memory location (HL).  Is that clear, or do you want ASCII art?

--------
Dan Eble <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: RLD & RRD

From: Martin Blix Grydeland <grydelan@stud.ntnu.no>

Prev: A86: Sprites
Next: RE: A86: list
Index(es):
- Main
- Thread