🚀 go-pugleaf

norm@bnr.ca (Norm MacNeil) writes:


>One a 386-33 machine, the IRQs are setup as the following:
>  IRQ1 Keyboard (I think)
>  IRQ2 [Cascade]
>  IRQ3 COM1
>  IRQ4 COM2
>  IRQ5 Mouse (bus)
>  IRQ6 (can't remember)
>  IRQ7 LPT1
>  ...
>The problem is the machine has a SoundBlaster, a bus mouse, and I want to
>connect a parallel printer (LPT1).  The I/O card manual says that LPT1 can
>be IRQ7 or IRQ5, but I can't seem to find out how to change the IRQ of the
>bus mouse even though when I type  MOUSE /?  it says its on IRQ5.  So right
>now I have the SoundBlaster on IRQ7 but cannot use the parallel port 'cause
>it'll lock up.  I could solve this if I could change the IRQ of the bus mouse
>to, say, IRQ10 but cannot find out how to do this.  Any ideas?  The video
>card does not have any jumpers on it so it is probably software changeable
>(if at all).  Another solution might be to change COM1 to IRQ10 but would
>this be advisable?

>Any info would be greatly appreciated.

You should be able to configure the interupt on the 
bus card itself.  On the old Microsoft bus mouse cards you
could set the interupt to 2 or 3 or 4 or 5.

I forget the correct explanation for the cascade - I think
it has something to do with getting into the A20
line or some such guff like that.  There was a series of posts
about IRQ2 and the cascade - history etc a while back.

Correct me if I am wrong but you should be able to set the 
bus mouse to IRQ2.  On my 486, I have the parallel port set
to the default of IRQ7 (I can't change it anyway) and
the soundblaster to IRQ5.  On most systems, you have to
set the soundblaster to something other than
its factory default of IRQ7 anyway as there is usually
a parallel port there.



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