I've recompiled the kernel with all mouse types enabled, with the mouse IRQ
at 2 where it is configured.  The configuration of the mouse according to
msd is:  (This is a bus mouse in an ATI card)

Mouse Hardware           InPort Mouse
Driver Manufacturer      Logitech
DOS Driver Type          InPort Mouse
DOS Driver Version       5.00
Microsoft Driver Version 6.02
Mouse IRQ                2
Number of Mouse Buttons  2
Horizontal Sensitivity   50
Mouse to Cursor Ratio    1 : 1
Vertical Sensitivity     50
Mouse to Cursor Ratio    1 : 1
Threshold Speed          53
Mouse Language           English

Which mouse type should be selected in Xconfig?  I've tried pretty much all
of them, with no mouse control.  Either I boot xwindows without a mouse, or
I get a "Device or resource busy", or I get a "Invalid parameter".

The logical choice seems to be to use the Logitech mouse type, but that is
where I get the message saying some kind of parameter is wrong.  What
parameters should I have set up?

As an alternative, is there a window manager available anywhere which allows
mouse movement under cursor controls?  Perhaps via the numeric keypad?