Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site yojna1.UUCP Path: utzoo!linus!decvax!decwrl!greipa!pesnta!amd!amdcad!lll-crg!gymble!umcp-cs!aplcen!cp1!yojna1!usenet 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 *** REPLACE THIS LINE WITH YOUR MESSAGE *** 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