Re: A83: Multiplying

To: Chris Hiszpanski <assembly-83@lists.ticalc.org>
Subject: Re: A83: Multiplying
From: Linus Akesson <lairfight@softhome.net>
Date: Mon, 24 Aug 1998 18:39:12 +0100
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <199808231515.PAA29461@scv.net>
Reply-To: assembly-83@lists.ticalc.org

On 23-Aug-98, Chris Hiszpanski wrote:

>Is there another method for multiplying rwo numbers together instead of
>using OP1 and OP2?

>From: Chris
>mecad@scv.net

If they're both 8 bits, you can put one in h and the other in l and then call
_htimesl. Result in hl, no overflow possible. If you're multiplying something
with a constant you might optimize a special routine to multiply by that
certain value. There's one in ROM that's called _HLTIMES9 I think.

Linus

References:

A83: Multiplying

From: "Chris Hiszpanski" <mecad@scv.net>

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