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From: lharris@gpu.utcs.toronto.edu (Leonard Harris)
Date: Sun, 24-Jan-88 18:57:20 EST
Message-ID: <1988Jan24.185720.5519@gpu.utcs.toronto.edu>
Organization: University of Toronto Computing Services
Subject: Multiplexing serial ports
Newsgroups: sci.electronics,comp.sys.ibm.pc

Hi.  I have an application that has to look at over 10 serial ports for
data.  Not all of them are active at once so I thought why not use 1 port
and have the rest muxed and just cycle through them until one is active.
It could also be interrupt driven to avoid the need for polling inputs - 
the main thing is I don't want to have to build 10 serial ports and kludge
them into a PC (I would rather do the programming in a high level language 
that understands COM1:)  Anyone have any ideas for a serial port mux (I
don't really need DTR, etc..  just the transmit and receive).
Thanks in advance
/Leonard