Thanks to all who replied to this posting. I have now got the mouse working.
To summarise : Support for PS/2 mouse is not in the kernel on the standard Debian boot disk, either built in or as a module. Thus, to use a PS/2 mouse one has to obtain a kernel with the required support. The special kernel 1 has the neccessary psaux.o module, so obtaining the corresponding image package, installing it, and adding "psaux" to the appropriate config file (/etc/modules ? I can't remember) will do the job. Ideally, however, I would have liked to compile a kernel which supported the PS/2 mouse, as well as some other features of the GATEWAY 2000, such as APM, and use that. I downloaded and installed the kernel source package from 1.1.3, configured it, and tried to make the image by doing ./debian.rules This did not work, however - the make failed (after the best part of an hour had elapsed) when it was unable to find "as86". I could not find as86 anywhere on my system, and so was stuck. Am I doing something wrong, or is it the case that the kernel-source package is flawed ? BTW, when I tried to config under X with make xconfig, tk failed with a complaint about there being no such colour as "gray" !?!? Any ideas here ? Some suggestions : - The default boot disk should have PS/2 mouse support available as a module, since the PS/2 mouse seems a reasonably common device, and new users will not be happy if they have to go to great lengths just to get their mouse working. - The modules.tgz file on the special kernel 1 boot disk is corrupted. If this was fixed I could have obtained the module I needed by extracting it from this file. - The apparent dependency of the kernel compilation procedure on as86 should be resolved - if this file is neccessary then it should be in one of the packages upon which the kernel-source package depends. Thanks again for everyone's help, Mark Johnston.