> More detail:
> The rs232 port Com1: is connected via a Null modem cable to an Adam 232 to
> 485 converter.
> In the Bios I have Com2 to 3 disabled.

> An IRQ clash is possible if Cutemouse uses IRQ4 from Com1. 
> My next step is to try different mouse drivers, unless I get more
> suggestions.

there can't be an interrupt conflict: in DOS, there is no interrupt
chaining. if the interrupts would be in conflict, you would not
receive any characters at all.

> In fact it even corrupts without movement as a result of being polled.
you didn't specify: what is 'corrupt' ?

a) characters as received on the other end?
b) input messed?
c) input characters dopped?

if c): are you using the FIFO? do you see the overrun error bit set?
   (most likely caused by the USB BIOS which disables interrupts
   longer then your baudrate allows. use the FIFO!)

Tom


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