Re: A86: Question

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Question
From: Wil Mahan <wmahan@asheboro.com>
Date: Sun, 21 Dec 1997 12:56:16 -0500
References: <3.0.5.32.19971221111239.007a4990@postoffice.worldnet.att.net>
Reply-To: assembly-86@lists.ticalc.org


A. El-Helw wrote:
> 
> Hello,
>         I am sorry if this is a stupid question, but I was trying to draw a line
> on one of my progs, and when I got it, I always get at least some junk
> around it... Anyone can see what I am doing wrong ?
> 
> Initialize:
>         call _runindicoff
>         call _clrLCD
>         ld b,85
>         ld c,0
>         ld d,85
>         ld e,64
>         ld h,1
>         call _ILine
>         call _getkey
>         ret
> 
>                                         =Ahmed
> 
> btw - clrscrn doesn't do the trick either...


There is a bug (or feature?) in the ROM that causes _ILine to display
part of the graph in the area around the line. Clearing the graph memory
first should fix the problem:

	ld hl,GRAPH_MEM
	ld (hl),0
	ld de,GRAPH_MEM+1
	ld bc,1024
	ldir
	set graphdraw,(iy+graphflags)

wil mahan
icq #4641865

References:

A86: Question

From: "A. El-Helw" <ahmed3@worldnet.att.net>

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