Re: vertical retrace inte

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Article #492

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#492

From: Cyberman
Date: Sat, 08 Aug 1992 03:10

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     -=> Egg08-06-92  21:49stos3.dsto.gov.au spoke of "Re: vertical retrace inte" <=-
    To All at 08-06-92  21:49
 Eg> I beleive its not a good idea to use the vertical retrace interrupt
 Eg> because according to "Programmers Guide to PC and PS2 video systems"
 Eg> hardware interrupts on IRQ2 cannot be distinguished from Vertical
 Eg> interrupts. I'm not that cluey on the subject but if its in the book
 Eg> ??? Apparently bus versoins of the Microsoft mouse cause this problem,
 Eg> and possibly other hardware that use IRQ2. If you are still keen on
 Eg> using it, The book shows you how. 

I also remember the PC WILL not share interupts.  Serial devices
can if they are on the same board, however if they are on
SEPERATE boards then you are in trouble.  IRQ 2 was specifically
set for the vertical retrace.  MS did it again you might say by
using it for thier blasted mouse.

        Stephen Cyberman@Toz.Buffalo.NY.US
        Scripted at Fri  08-07-1992  10:01:40

... I am still in B testing, wait until I am released
--- Blue Wave/QWK v2.10

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Path: arc1-ca.pugleaf.net!sparky!uunet!usc!rpi!uwm.edu!rutgers!ub!toz!cyberman
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: rec.games.programmer
Subject: Re: vertical retrace inte
Message-ID: <gate.e146oB1w165w@toz.buffalo.ny.us>
Date: 8 Aug 92 03:10:37 GMT
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