Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!uupsi!sunic!dkuug!imada!micro
From: micro@imada.ou.dk (Klaus Pedersen)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Bug in Overscan software.
Message-ID: <1991May19.163606.18142@imada.ou.dk>
Date: 19 May 91 16:36:06 GMT
References: <1991May14.193547.29278@imada.ou.dk> <3365@quepasa.cs.tu-berlin.de>
Sender: news@imada.ou.dk (USENET News System)
Organization: Dept. of Math. & Computer Science, Odense University, Denmark
Lines: 59

ki@opal.cs.tu-berlin.de (Karsten Isakovic) writes:

>In article <1991May14.193547.29278@imada.ou.dk> micro@imada.ou.dk (Klaus Pedersen) writes:
>>There have been some talk about Overscan here lately, that reminded me
>>that I found 2 bugs in the driver software. The bugs are in the same 10
>>lines of code, and they are kind of strange! 

>Hello Klaus,

>the actual driver for the autoswitch-overscan is 51! versions away from the
>old one released into netland. I found lots of bugs ;-)

I my version I have fixed these :
   o a bug that ment that some programs wrote one pixel outside
     the screen, have been fixed.
   o the software is 68010/20/30/40 clean. 
   o the software works on TOS 1.4 and __later__! (it don't use
     undocumented system variables to enlarge the screen memory
     any more!)
   o it is now possible to disable Overscan, from within a bad
     program (last resort, as it is not possible to tell accs
     and the AES about the new screen size).
   o it is also possible to enable/disable Overscan from the
     desktop (general, because it is possible to init. AES and
     accs).
   o the hook into VDI now preserves ALL address registers!
   o the driver is now 3700 bytes, of which 3000 stays in memory,
     (not counting the larger screen (68Kb)).

 
>The autoswitch feature is about 32 versions old and running very stable. I
>ported this feature to some other software, now we have the autoswitch
>SM-124 emulator for TT-High and and autoswitch driver for the Reflex 1024
>card.

How do you tell accs and the AES about the new screen size, I know that you
have a reputation for making some really awsome hooks into TOS/GEM. But 
you can't tell accs that the screen size have changed - can you?

>>Then why don't I release my version?
>>- Overscan is Commercial now so I don't know if it's legal. Also my version 
>>have been hacked so much that it probaly have even more errors.

It have been running stable for some time though, and a lot have been fixed!

>>How can we fix this problem - I guess that Karsten will tell us that he have
>>a fix (called autoswitch Overscan).

>You are right :-)  But it was a good way to say 'what is wrong', so everybody
>interested can change it in the source...

But not everybody can! If I send my version to atari.archive, (driver bin
and source only) would you care? Should I release it as a Patch like KAOS,
so that everybody that allready have overscan can patch it?? (sick)

>>Klaus, micro@imada.ou.dk 
>Karsten, ki@opal.cs.tu-berlin.de

Klaus, micro@imada.ou.dk