[A83] Re: Inverting graph buffer in one time

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Inverting graph buffer in one time
From: Peter-Martijn Kuipers <hyper@hysoft-automation.com>
Date: Mon, 29 Oct 2001 21:25:01 +0100 (CET)
In-Reply-To: <F132wzf7apDR1oLxx210001c054@hotmail.com> from "Emir Sakic" at Oct 29, 2001 08:58:37 PM
Reply-To: assembly-83@lists.ticalc.org


> Actual routine from Penguins (courtesy Bill Nagel):
> 
> invert:
>      ld   bc,768
>      ld   hl,plotsscreen
> inv_loop:
>      ld   a,(hl)
>      cpl
>      ld   (hl),a
>      inc  hl
>      dec  bc

Good trick to compare bc with zero...
>      ld   a,b
>      or   c
---

>      jr   nz,inv_loop
> 
>      ret
> 
> 
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
> 
> 
>

References:

[A83] Re: Inverting graph buffer in one time

From: "Emir Sakic" <saka@hotmail.com>

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