RT 4-port card in 486 isa

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#1224

From: Dan Muntz
Date: Thu, 17 Dec 1992 21:17

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I'm trying to get an RT 16-bit 4-port card to work in a 486 isa box running
386bsd.  The card works if polled, or if another com device generates
interrupts (all ports are checked on any com interrupt), but the 4-port
card doesn't seem to be generating interrupts (IRQ 10).  I've seen
two things in the RT tech ref.: 1) it looks like the 4-port card was
designed to work in a PC AT (I'm not certain of this) and 2) RT 16-bit
cards are supposedly *not* compatible with AT 16-bit cards.

Some questions:

  1) Are the 16-bit slots in an RT wired differently from those in an AT?
  2) If so, can this be corrected with a soldering iron: perhaps by cutting
     the IRQ10 trace on the 4-port (which one is it?) and wiring it to
     either the AT IRQ10 pin, or a lower IRQ line?

Any info, slot diagrams, or random thoughts on the subject would be
appreciated.

  -Dan
   dmuntz@eecs.umich.edu

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Message-ID: <1992Dec17.211743.2068@zip.eecs.umich.edu>

Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!umn.edu!umeecs!quip.eecs.umich.edu!dmuntz

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Newsgroups: comp.sys.ibm.pc.rt,comp.sys.ibm.pc.hardware,comp.unix.bsd
Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!umn.edu!umeecs!quip.eecs.umich.edu!dmuntz
From: dmuntz@quip.eecs.umich.edu (Dan Muntz)
Subject: RT 4-port card in 486 isa
Message-ID: <1992Dec17.211743.2068@zip.eecs.umich.edu>
Sender: news@zip.eecs.umich.edu (Mr. News)
Organization: University of Michigan EECS Dept., Ann Arbor, MI
Date: Thu, 17 Dec 1992 21:17:43 GMT
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