[A83] Re: APD in getk loop

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: APD in getk loop
From: "Henk Poley" <HPoley@DDS.nl>
Date: Wed, 6 Feb 2002 12:24:39 +0100
Reply-To: assembly-83@lists.ticalc.org


> Van: TypeR unknown <typerfuture@hotmail.com>
> 
> Can somebody tell me how I can use the Automatic Power Down in a Getk
loop?
> 
> This loop currently looks like this;
> 
> loop:
>    call _getk
>    or a
>    jr z,label

If you want to save plotSScreen to the APD-buffer you can use _SaveDisp (or
_SaveOscreen) at $4859, and _RestoreDisp at $4BA4 to put it back again.


To switch off the calc:

	ld	a,2		;
	out	($10),a		; display off
	ld	a,1		;
	out	(3),a		; enable only [ON]-interrupt and turn
				; LCD-driver into standby mode
	halt			; wait 'til [ON] keypress
	ld	a,%1011		;
	out	(3),a		; enable [ON] interrupt and periodic
				; interrupt. Turn on LCD driver
	ld	a,3		;
	out	($10),a		; display on

You should know that when you switch off the LCD-driver the screen will be
cleared. The above *routine* doesn't affect plotSScreen so just calling
FastCopy will help.

	Henk Poley <><

Follow-Ups:

[A83] Re: APD in getk loop

From: =?iso-8859-1?Q?David_Lindstr=F6m?= <okvin@tiscali.se>