A85: Re: Assembly-85 Digest V1 #530

To: <assembly-85@towerguard.unix.edu.sollentuna.se>
Subject: A85: Re: Assembly-85 Digest V1 #530
From: "Jimi Malcolm" <MalcolmJ1@email.msn.com>
Date: Sat, 27 Mar 1999 23:19:09 -0500
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-85@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-85@lists.ticalc.org


i'm including a routine that multiplies h and l and puts the answer in hl
(hl=h*l).  you probably want to do something like the following example.

jimi

usage:
ld h,16    ;you wanted to multiply something by 16
ld l,<what you wanted to multiply it by...i'm assuming rows of pixels>
call &mult_hl
ld de,VIDEO_MEM
add hl,de


===============
MULTIPLY H&L
input:  h,l
output: hl=h*l
destroy:b
---------------
mult_hl:
 dec h
 ld b,h
 ld h,0
m_1:
 add hl,hl
 djnz m_1
 ret
===============

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A85: Re: Re: Assembly-85 Digest V1 #530

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