Re: vertical retrace inte

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1 total messages Started by Secret Mud Mon, 10 Aug 1992 10:18

#546

Author: Secret Mud
Date: Mon, 10 Aug 1992 10:18

15 lines
941 bytes

From: cyberman@toz.buffalo.ny.us (Cyberman)
>
>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

The vertical retrace interrupt didn't exist until the EGA card.  Microsoft's
mouse card was already out before the EGA card existed.  IBM "did it again" in
this case.  (Not their fault--other than the lack of ability for the bus to
share interrupts.)

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