SB> Well first I would suggest, avoid COM4 if you dont absolutely have to use

Hi Simon, Thanx for your help. I tried your suggestion and avoided COM4 
entirely, allocating the Modem card to COM2 after disconnecting COM2 on the 
I/O card. No Joy though.  PortInfo reported COM2 as absent and then after
installing the internal modem card identified COM2 at the address (2F8),
which I believe is correct, but then it went on to say that COM2 is unable to 
generate interrupts. When I re-connected COM2 on the I/O card and used an 
external modem, the port tests OK and the modem runs just fine.  Given that 
the external modem runs at the same baud and is using the same phone line as
the internal card, it seems to me the problem must be at the modem/computer 
end of the system.  Presumably either the I/O or the fax/modem card. 
 
 SB> Umm, problem with your theory here, is that 2e8 *IS* the correct address
 SB> for COM4 - thats what makes it COM4!

Interesting Simon. Could this be a system problem? With the internal modem 
installed I found that by switching it between Com ports, MS Diagnostic from 
DOS 6 also read COM3&4 as 2e8 and 3e8 respectively, are they perhaps allocated 
incorrectly? - Regards Chi
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