XENIX 286 2.2.2 help

[Mark Dornfeld]

Hardware: Sperry IT, CDC 40 MB disk, 1Mb RAM on Motherboard,
AST Multi-function card w/ 1.5Mb RAM. Sperry Parallel/Serial
board.

The system ran perfectly for over 2 years.  Then it began to
crash on large print jobs with a trap in system error message
with a bunch of registers dumped.

I have swapped every major plug in board with no better
results.  I tested the parallel ports with "cat >> /dev/lp1"
with proper results, but when I tested "cat >> /dev/lp0" the
system returned a "stray interrupt" error message for every
character typed.

The system is otherwise perfect, but frequent crashes are too
hard to take.

Is it possible the interrup controller on the system board is
shot?

Mark T. Dornfeld
Royal Ontario Museum
100 Queens Park
Toronto, Ontario, CANADA
M5S 2C6

mark at utgpu!rom      - or -     romwa at utgpu