Re: A85: 16 bit registers...

To: assembly-85@lists.ticalc.org
Subject: Re: A85: 16 bit registers...
From: Kaus <kaus@cybrzn.com>
Date: Tue, 29 Dec 1998 06:59:34 -0600
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <Pine.A41.3.96.981229175940.49816A-100000@acs2.acs.ucalgary .ca>
References: <004d01be338b$8de94ba0$6601d2d1@desktop-1>
Reply-To: assembly-85@lists.ticalc.org


hey man. thats good stuff!

At 06:00 PM 12/29/98 -0700, you wrote:
>
>
>Here's probably the quickest, smallest way to do this:
>
>loop:
>; loop stuff here
>dec bc
>ld a, b
>or c
>jr nz, loop
>
>On Tue, 29 Dec 1998, Michael Turitzin wrote:
>
>> 
>> 
>> I'm VERY new(about 2 days) to ti-85 assembly code, so excuse this newbie
>> question.  I'm trying to check if a 16 bit register( bc ) is 0, but I can't
>> find a way to do it other than checking b and then c for 0 values.  "dec"
>> seems to only set z if the register is 8 bit, and most everything else I
can
>> find that sets this value uses A and needs an 8 bit register as the
>> "parameter".  This is the code I am currently using:
>> 
>>  dec      bc
>>  ld       a, 0
>>  cp       b
>>  jr       nz, FlashLoop
>>  cp       c
>>  jr       nz, FlashLoop
>>  jr       MainLoop
>> 
>> Is there a better way of checking for a zero value in bc?
>> 
>> MaNiAc
>> 
>> 
>
> from the Dark Side of the Moon...
>			              /\       ________________
>			  -----------/  \======================
>          			    /____\     ----------------
>   Erik Huizing
>   ehuizing@ucalgary.ca
>   http://www.ucalgary.ca/~ehuizing
>
>

References:

A85: 16 bit registers...

From: "Michael Turitzin" <stevet@thevision.net>

From: