how to connect a modem to the PS2 port?

Ted Mittelstaedt tedm at
Sat Oct 14 17:49:48 PDT 2006

The PS/2 port is not a RS232 serial port.

It is a serial port, but it is specifically designed for a "PS/2 mouse"
serial protocol, that has nothing to do with RS232.

Your going to have to do what the rest of us do and use a
USB to serial port adapter.


----- Original Message ----- 
From: "ches" <ches at>
To: <freebsd-questions at>
Sent: Saturday, October 14, 2006 5:34 PM
Subject: how to connect a modem to the PS2 port?

> I am using a laptop as a server, and need a second serial port on it.  I'd
> love to use the psm0 port (I know it is an RS232C serial port) connected
> a modem, but I am guessing the the psm driver is getting in the way.
> It is hard to ask the right question in Google.
> Anyone know how to use the PS2 port as a simple serial port?  I never
> use a mouse on this machine.
> Bill Cheswick
> ches at
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