gsg0384@uxa.cso.uiuc.edu (05/07/89)
Hi,
I have a problem with my mouse connected to IBM PS/2 - 50.
(My mouse is MSC Technologies optical three-button mouse.) The system
ocasionally, not always, shows one of the following error codes,
301, 302, 8601, 8602
or some combination of the above at the boot time after RAM check (1024K OK).
Or sometimes it finishes booting process, but the mouse is installed on
COM 1: (Port 3FB IRQ 04) erroneously. It should be installed on
Pointing Device Port. Then I retry booting by powering-off-and-on
(Ctl-Alt-Del sometimes does not cure the problem).
Usually, it becomes OK. When it went wrong, I checked the system with
the Reference Diskette supplied by IBM, putting the diskette and
Ctl-Alt-Del. This displays
8602 : Error in the mouse.
or something like that.
When either 301 or 302 appears, it always appears with either 8601 and 8602.
Both 301 and 302 mean the keyboard error for IBM PCs and IBM PS/2's.
After all I can conclude that the computer fails to self-test the
Input Device Port.
So I disconnected the mouse and have observed the booting behavior of the
system. Those error message has never appeared since then. So I am
confident that I located the problem area correctly.
One of my friends who has an IBM clone and Mouse System's serial mouse
told me that he has never had such problem. So I guess that IBM PS/2's
keyboard-mouse interface is weaker than the RS232-C serial port interface
and vulnerable to initial power-up overshoot of the optical mouse's LED
bias current. Actually I've seen IBM PS/2-60 showing the same problem
with the *original* IBM mouse.
Have you ever had the same problem with the IBM PS/2 machines?
Is there any cure for this problem?
Thanks.
G. Hugh SONG
gsg0384@uxa.cso.uiuc.edu
My PC Mouse model number is
MODEL M4P2