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From: sdh@joevax.UUCP (Retief of the CDT)
Newsgroups: comp.sys.apple
Subject: Re: // screen memory question
Message-ID: <373@joevax.UUCP>
Date: Fri, 5-Dec-86 10:31:59 EST
Article-I.D.: joevax.373
Posted: Fri Dec  5 10:31:59 1986
Date-Received: Sun, 7-Dec-86 02:53:20 EST
References: <18800002@uiucme> <72@nikhefk.UUCP>
Organization: Bell Communications Research Inc., Morristown, NJ
Lines: 27

> Try the following (I've not tried this so dont blame me if it doesn't work
> exactly this way...) :
> 
> 	/* before saving anything else on /RAM /*
> 
> 	BSAVE /RAM/SCREEN1,A$2000,L$FFFE /* HiResScreen #1 /*
> 	BSAVE /RAM/SCREEN2,A$4000,L$FFFE /* HiResScreen #2 /*
> 
> 	/* You now have to files in your /RAM disk, on the spot
> 	   where in normal life the Double HiRes second page would be /*
> 
> 	/* Now move your screens between the normal HiResScreen and the
> 	   files on the /RAM disk. Since these BSAVE's and BLOAD's are
> 	   in effect memory moves, they ought to go reasonably fast /*
>

DO NOT TRY TO DO THIS!

First of all, the save only does the hires screen, not the text screen,
as was wanted.  Second the length for both is off by a factor of 8!
the most efficient save of a hires screen is using L$1FF8 (the last 8
bytes are not displayed, so why save them?).  Using length $FFFE saves
64K (8 times the length of the hires screen).

Steve Hawley
joevax!sdh