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From: gordon@sage.cs.reading.Ac.Uk (Simon Gordon)
Newsgroups: net.micro.atari16
Subject: Re: Screen saver/dimmer
Message-ID: <190@sage.cs.reading.Ac.Uk>
Date: Fri, 20-Jun-86 17:28:21 EDT
Article-I.D.: sage.190
Posted: Fri Jun 20 17:28:21 1986
Date-Received: Tue, 24-Jun-86 04:23:28 EDT
References: <8606172339.AA28794@ucbvax.Berkeley.EDU>
Reply-To: gordon@sage.UUCP (Simon Gordon)
Organization: Comp. Sci. Dept., Reading Univ. UK. (sage)
Lines: 36

In article <8606172339.AA28794@ucbvax.Berkeley.EDU> K538915@CZHRZU1A.BITNET.UUCP writes:
>2 screen savers: the first one cycles thru the palette registers
>                 (you could make this one even fancier, but i've
>                  only got a monochrome set),
>                 the second one turns the internal gereration of the
>                 horizontal and vertical sync pulses off. This results
>                 in a nice black screen, but it also means you lose
>                 the hblank and vblank interrupts.
>                 ----->>>any routine in the vblank queue stops
>                 ----->>>disk changes will not be noticed
>                 ----->>>drives will not be deselected
>                 so dont flame me if you scramble your disk!!
>                 If anybody finds a way of using a timer interrupt
>                 to get around this: tell me!
>
Ive got a rather good screen saver which i will try to send in some time.
Once the program is run it is hooked into the screendump VBL interupt.
If you type alt help the full pallette and screen data are saved to disk
in degas format. I have converters to go degas>neo neo>degas.

(unfortunately my st isnt connected to the net, so it may be a while before
i can do so)

Thsi works with allmost all games (not bratacus as it replaces the os)
(only monochrome pawn as in colour a split mode is used so they take over
the interupts.)

It apears to have no side affects - i used this to give my local dealer a
good slide demo, and when one of the assistants saw the megaroids screen he
 decided
to play it - and couldnt work out why it didnt work

ps. Im also writing a backup program that can duplicate ANY floppy disk
on the ST. Ill tell you all when its finished.

Simon@sage@reading