Path: utzoo!mnetor!uunet!husc6!bbn!uwmcsd1!ig!agate!ucbvax!bknlvms.BITNET!droms
From: droms@bknlvms.BITNET
Newsgroups: comp.os.xinu
Subject: Problems with DEQNA
Message-ID: <8802141949.AA08430@arthur.cs.purdue.edu>
Date: 14 Feb 88 20:04:56 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 17
X-Unparsable-Date: Sun, 14 Feb 1988 14:49:32.63 EST


I recently added a DEQNA (M7504) module, etch b, rev a to an LSI 11/2
system.  I'm trying to run Xinu V7.  The DEQNA is exhibiting some strange
behavior.  When I run Xinu, the program terminates with an illegal
instruction panic at the first access to the DEQNA I/O registers.  I
checked the machine code at the point the panic was generated, and it
seems to be a perfectly valid MOV instruction, with one of the I/O
registers as an operand.  If I try to access the I/O registers
through the LSI 11/2 microcode ODT, the processor goes into
an unknown state in which it incorrectly echoes or ignores keyboard
input, and I have to reboot the system.

Anyone seen these symptoms before?  Any advice or ideas would be
greatly appreciated.

- Ralph Droms
  Bucknell University
  droms@bknlvms.bitnet