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From: usenet@yojna1.UUCP (usenet signon)
Newsgroups: net.micro.trs-80
Subject: Re: Model 100 as a general purpose modem?
Message-ID: <113@yojna1.UUCP>
Date: Fri, 1-Nov-85 18:39:46 EST
Article-I.D.: yojna1.113
Posted: Fri Nov  1 18:39:46 1985
Date-Received: Tue, 5-Nov-85 20:21:49 EST
References: <2263@sdcc6.UUCP> <2049@reed.UUCP>
Organization: Yojna1 Amateur Radio Packet Unix System; Germantown, Md.
Lines: 18


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No, you cannot use the Model 100 as a general purpose modem.  There is only
one UART in the 100 and that is shared between the modem and the RS-232
port.  PB3 of the 81C55 is the signal RS232C- and is used to gate the output
of the IM-6402 UART to _EITHER_ the modem chip _OR_ the RS-232C drivers/
receivers.  Sorry, you can't have your cake and eat it too.  If you are
interested in hacking, port B of the 81C55 is at address B2h.

As an aside, I have had some fun playing with the UART from Basic.  I have
succeeded in sending 1, 1.5, and 2 stop bits; in sending 5, 6, 7, and 8 data
bits; and in setting the baud rate to just about anything.  I will be happy
to share my information with anyone who needs it.

73 de Brian, WB6RQN
...!bellcore!yojna1!wb6rqn
...cp1!yojna1!wb6rqn