My system runs more than 4 hours now...

[Jay "you ignorant splut!" Maynard]

Thanks to the many of you that responded to my call for help. Your
responses were very helpful, and I think the problem has been at least
softened somewhat...

John Plocher told me that the console driver gets flaky in the presence
of two working video adapters. I removed the monochrome display adapter,
which was unused, and the problem appears to have disappeared: my system
has been running for 5 days now without a problem.

Other very good suggestions were to remove the other unused hardware,
which I'll do should the problem recur; make sure the emulate switch on
the VEGA Deluxe was turned off (it was; I did that back when I was
trying to get DOSMerge to work [unsuccessfully]); and try running on
just one hard disk (unfortunately, I have / on /dev/dsk/0s0, /usr on
/dev/dsk/1s2, and /usr/spool on /dev/dsk/0s2, making that one
impractical).

Again, thanks for your help. This is what makes Usenet, for all its
flamage, the valuable resource it is.

-- 
Jay Maynard, EMT-P, K5ZC, PP-ASEL   | Never ascribe to malice that which can
uucp:        uunet!nuchat!   (eieio)| adequately be explained by stupidity.
    hoptoad!academ!uhnix1!splut!jay +----------------------------------------
{killer,bellcore}!texbell!          | "Less great!" "Tastes filling!"