🚀 go-pugleaf

     -=> Khan spoke of "Re: vertical retrace inte" <=-
    To All at 08-10-92  13:49
 Kh> For starters, the MS Bus Mouse can use several different IRQ levels;
 Kh> by no means is it fixed at IRQ2 (I know, I have one, and it's set at
 Kh> IRQ5). As for sharing interrupts, your assertion that the PC will not
 Kh> share them is just plain false. As long as there is a reliable way to
 Kh> interrogate the hardware to see if it generated an interrupt, the only
 Kh> thing stopping interrupts from being shared are LAZY or INCOMPETENT
 Kh> PROGRAMMERS. A simple example:

You still don't understand!  I was not talking SW I was talking
about the PC bus!  That's the problem not sogtware.  It APPEARS
as though you did not read the message Carefully.  Very simple.
The PC/AT bus cannot share interupts.  That doesn't mean devices
can't share the IRQ's, the bus can't share them.  It's a hardware
limitation which can only be circumvented by hardware not JUST
software.

Example
4 serial ports on a single card set for com1-4.  Standard this
means 2 share IRQ3 and IRQ4.  They are all on a single card which
or's thier interupts with a logical gate.  This allows them to
share interupts.

Internal modem and a serial port card.  since these are sperate
cards they cannot share the same interupt.  IE one must be IRQ3
and one must be IRQ4 [standard serial port interrupts].

        Stephen Cyberman@Toz.Buffalo.NY.US
        Scripted at Tue  08-11-1992  09:48:29

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