Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!mailrus!uflorida!gatech!dscatl!lindsay
From: lindsay@dscatl.UUCP (Lindsay Cleveland)
Newsgroups: comp.unix.microport
Subject: Re: AST 4-port under uport /386 v 3.0-2.2L
Summary: Possible solution, disable interrupt sharing
Message-ID: <10230@dscatl.UUCP>
Date: 26 Aug 88 17:08:30 GMT
References: <3985@freja.dk>
Reply-To: lindsay@dscatl.UUCP (Lindsay Cleveland)
Organization: Digital Systems Co,  Atlanta, Ga
Lines: 72

In article <3985@freja.dk> keld@freja.dk (Keld J|rn Simonsen) writes:
>I have problems installing an AST 4-port card on an NCR PC 916
>machine running Microport UNIX/386 release 3.0 2.2L

I also had a problem, but it turned out to be an option switch
setting.  Specifically, if the AST's "Interrupt Sharing" switch is
enabled (SW3-3 down), the AST board is then looking for *another*
AST board to be installed in your computer.  If it doesn't find it,
things tend to just sit there.  Turning the switch ON (disable
interrupt sharing) made everything work just just fine.

On my system, I have a multi-purpose board on IRQ4 (parallel
printer and serial port /dev/tty0), so I set up the AST for IRQ3.
Here are the specifics...(I saved it in /etc/ttysetup just so I could
always do it the same way again when the next system upgrade comes
through):

----/etc/ttysetup--------------
  #  Setup for AST 4-port Cluster board
  #
  #  NOTE: AST Interrupt sharing switch is set to "disabled" (SW3-3 ON)
  #   tty1 (IRQ 3 == COM2) is not connected
  #
  #  IRQ     3
  #  Vector  447 (0x1bf)
  #  Channel 1   416-423 (0x1a0-0x1a7) tty2
  #  Channel 2   424-431 (0x1a8-0x1af) tty3
  #  Channel 3   432-439 (0x1b0-0x1b7) tty4
  #  Channel 4   440-446 (0x1b8-0x1be) tty5
  #
  /etc/ttypatch -t2 -n4 -i3 -v447 -a416  -m0
  
  #  IRQ    4   1016-1023 (0x3f8-0x3ff) tty0
  #
  /etc/ttypatch -t0 -n1 -i4       -a1016 -m12
  
  #  No tty1 defined
  #
  /etc/ttypatch -t1 -n1 -c


System specifics:

  Computer:  Everex CLUB/AT 1800 (i286-AT clone)
  Clock:     10 Mhz
  System:    Microport 2.3.0-UM  (Unlimited users, DOS/Merge)
  Other Interrupts:
         IRQ2   Voyetra MIDI Interface board
         IRQ3   AST 4-port board
         IRQ4   SUNTEK I/O Extension Board (1st serial port)
         IRQ5   Microsoft Mouse
         IRQ6   Floppy Disk
         IRQ7   SUNTEK I/O Extension Board (parallel printer port)
  AST Switch Settings:
     SW1-1 off
     SW1-2 on   IRQ3
     SW1-3 off
     SW2-1 off
     SW2-2 off
     SW2-3 off
     SW3-1 off  Enhanced Mode
     SW3-2 off  Channel addrs: 01A0-01BE, Vector: 01BF
     SW3-3 on   Disable Interrupt Sharing
     SW3-4 off  (reserved...must be off)

Hope this information helps.

Cheers,
  Lindsay

Lindsay Cleveland         Digital Systems Co.   Atlanta, Ga
  gatech!dscatl!lindsay     (404) 497-1902
                         (U.S. Mail:  PO Box 1140, Duluth, GA  30136)