Date: Fri, 20 Aug 93 09:58:24 -0400
From: DJ Delorie <dj AT ctron DOT com>
To: akrause AT saturn DOT sdsu DOT edu
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: 

Most libraries only support COM1 and COM2 because they're the only
ones that have an IBM-defined standard for programming to them.
There's probably a common API for COM3 and COM4, but it's not as rigid
as for 1&2.