Re: A83: a question

To: assembly-83@lists.ticalc.org
Subject: Re: A83: a question
From: Jkhum98@aol.com
Date: Sat, 10 Jul 1999 16:25:18 EDT
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-83@lists.ticalc.org
Reply-To: assembly-83@lists.ticalc.org

In a message dated 7/10/99 3:16:41 PM Central Daylight Time, 
bomber912@hotmail.com writes:

> Hi everybody ...
>  
>  I have a question and it is really freacing me out
>  
>  There is a place in my prog that generates an ERR : Overflow...
>  
>  it looks like this :
>  
>  I have xy coordinates in bc
>  
>  push bc
>  couple of things that screw with registers
>  pop bc
>  
>  ;now i want to display the value of my x and y coordinates at 5,5 and 5,9
>  
>  	push bc
>  	ld hl,0505h
>  	ld (PENCOL),hl
>  	ld a,b
>  	call _SETXXOP1
>  	call _DISPOP1A
>  
>  	pop bc
>  	ld hl,0905h
>  	ld (PENCOL),hl
>  	ld a,c
>  	call _SETXXOP1
>  	call _DISPOP1A
>  
>  
>  and it does the overflow error ... now is there something I'm not seeing 
>  here or is it a logic problem
>  
>  thanks for any suggestions
>  
>  homonerdicus
>  
>  "summer is here, bring on the beer"

Do a "call _zeroop1" before each of your "call _setxxop1" commands, because 
that command wont set all of OP1 to what A is, just the first byte, so there 
could be crap in the rest of OP1 which is why _DispOP1a cant handle it. Btw, 
you have to put the value into A of how many characters you want to display, 
that also may be causing th overflow error. cya...

Jason_K