> 
> I need an extra (low-speed) serial port on a DECstation 3100 and
> 5000/200.  On the NetBSD pmax page (under the 2100 and 3100) is the
> comment: "Two ports are reserved for a keyboard and mouse. (An
> adaption-connector can make these ports usable as RS-232  serial ports
> with no modem control.)"
> 
> Can anyone give me a part number, or wiring information for such an
> adaptor?  Any advice
> would be appreciated.
> 

Hi,

poke around DEC's place at ftp: crl.dec.com/pub/Digital/CRL/tech-reports

I think there's a PMax functional spec there. Can't remember the title --
but it's about 180KB compressed. This might be enough (haven't read it
in detail). You want it anyway :)

Dave