🚀 go-pugleaf

In <1993Jan7.122713.17450@walter.cray.com> kelly@spyro.cray.com (Matt Kelly) writes:
>HELP!!!!

>I built a home-brew MIDI interface for my synthesizer setup.  When
>I built it, I had an old PC-XT clone.  I hooked up the receiver
>section of the interface's UART chip (8250) to IRQ2.  This worked
>just dandy.

>Now I have a 386-SX system.  IRQ 2 doesn't work anymore.  All docu-
>mentation I have read has said that IRQ2 is a "cascade" interrupt.
>WHAT DOES THIS MEAN, AND HOW DO I MAKE IT WORK????

>In an effort to speed up my success, I rewired the interface so
>that it would use IRQ5 instead of IRQ2.  Still no interrupt response.

>I took the software I was using on the old system (which I wrote),
>and re-compiled the .ASM files which handle the interrupts so that
>they would use IRQ5 instead.  Total death.

>Any help would be appreciated.  The system I have is a Goldstar with
>2 serial, 1 parallel, 1 game port, 40 meg HD, 2 floppy drives, VGA.

>Thanks in advance,

>Matt K.
>==============================================================================
>kelly@els.cray.com                   |   Cray Research, Inc.
>                                     |
>Opinions expressed herein are just   |   "The world's fastest supercomputers".
>that.                                |
>==============================================================================

That's "cascade" as in falls into a bunch of pieces.  The IRQ2 was split
at the time of the AT (I think) to provide more interrupts for use.  Eight
bit cards still can't use the bigger numbers, but I understand that the
16bit cards that need interrupts can do so.  

According to my new motherboard's manual, here they are:

IRQ 2	|--IRQ 8	Realtime clock interrupt
        |--IRQ 9	INT 0AH
        |--IRQ 10	Reserved
        |--IRQ 11	Reserved
        |--IRQ 12	Reserved
        |--IRQ 13	Coprocessor
        |--IRQ 14	Hard Disk
        |--IRQ 15	Reserved
       

-- 
__
"Even if you're on the right track, 
you'll get run over if you don't move."  --Will Rogers.

terry@dadstoy.gbdata.com	Terry Stockdale		Houston, Texas