uccxmgm@unx2.ucc.okstate.edu (Martin McCormick) (03/27/91)
We have a most exasperating problem with an IBM PS2
Model 70 running MSDOS 4.01. The system has a ROM BIOS
copyright date of 1988 and has been working perfectly for
well over a year. I recently wanted to use it with some
applications which required operating the system through the
serial comm port. I discovered that I couldn't make the
CTTY command work at all. I could run "Kermit" and
communicate back and forth between the PS2 and another unit,
but try as I might, I couldn't get CTTY to work.
I also tried using DOS redirection commands to send the
output from directories and the like to the comm port with no
luck. If you use the CTTY command, the machine generates a
write fault error and allows you to regain control by hitting
ctrl-break.
I also ran a special program I had written in assembler which
outputs to the serial port through the ROM BIOS. This
program also failed. It didn't lockup, but nothing came out
of the serial port either. Does anybody have any ideas on
what is happening and how to correct it? Another PS2 Model
70 sitting right next to it can do this with no problem. Our
IBM representative says that there is no bug that he knows of
in the early Model 70's. The diagnostic and DOS installation
routines have been run so many times on this machine that it
is probably the best diagnosed PS2 West of the Mississippi.
Any help is greatly appreciated.
Martin McCormick
WB5AGZ
Oklahoma State University Computer Center
Stillwater, OK