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.

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