Get a serial to PS2 adapter or a PS2 mouse.  This, of course assumes this older machine has a PS2 plug.  This would be safe and cheap as well as quick and dirty.

>I apologize in advance for not having more information
>on this but I have a hardware issue posed to me which
>I need to see if there's anything I can do.
>
>From what I know it's an NEC Laptop (age unknown)
>running Windows95.
>
>The trackball apparently does not work right now and
>the user has a serial mouse and a modem and they use
>on this machine as well. The modem is external and
>apparently there is only one serial port on this unit.
>
>
>My experience pretty much precludes knowledge of what
>to do in this instance. Assuming I can't fix the
>trackball, how can I get both the serial mouse and
>modem working? Is there a way to daisy chain them
>that's not going to create an IRQ conflict?
>
>It's not critical that I solve this as they have a
>desktop machine as well now but I would like to be
>able to provide a solution.
>
>I will post more the early part of the week if more
>info is needed.
>
>I appreciate any suggestions I can at least explore.
>


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