Well, I downloaded the latest AMouse and installed it.
This what it did to the config.sys:
It didn't touch the USB statements, but replaced USBMOUSE.SYS.
My system has one EHCI controller and two OHCI controllers.
Anyway, with the above, the system trapped at startup, blaming CDFS.
I modified the first USB line to this after reading the docs of AMouse:
BASEDEV=USBD.SYS /V /REQ:USBOHCD$
This produced a bizarre message stating that the system did not have
enough space to activate swapping (there's plenty of space on the
designated swapper drive). But it did get to the desktop. The USB mouse,
however, was completely ignored.
I tried changing it to /REQ:USBEHCD$ as well, just in case I'm mistaken
about it being in a USB 1.1 port instead of 2.0, but there was no change
(same odd message about swapping).
I also tried with and without /DEVICE:1 on the USBMOUSE.SYS statement.
After copying the old USBMOUSE.SYS back to try the IBM drivers again, I
get a trap in OS2KRNL. I've now disabled USB completely, and will just
use the old PS/2 mouse, since it appears to be a lost cause.
Remove 'spambegone.net' and reverse to send e-mail.