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From: johnl@ima.ima.isc.com (John R. Levine)
Newsgroups: comp.sys.next
Subject: Re: dumb terminal dumb
Message-ID: <4076@ima.ima.isc.com>
Date: 16 Jun 89 01:10:22 GMT
References: <9001@phoenix.Princeton.EDU>
Reply-To: johnl@ima.UUCP (John R. Levine)
Organization: Segue Software, Inc.
Lines: 14

In article <9001@phoenix.Princeton.EDU> andy@phoenix.Princeton.EDU (Andrew M. Milburn) writes:
>I'm having some difficulty connecting a dumb terminal to my cube.
>A perfectly good null-modem cable results in data travelling succesfully
>from the NeXT to my adm3a, but nothing goes the other way.

The problem is that the NeXT is RS422 while your terminal is RS232.  I had
exactly the same problem trying to hook up an IBM PS/2-50 as a terminal.
Turns out that the NeXT is using levels of (roughly) +5 and ground, while the
terminal wants +5 and -5.  Many RS232 receivers are forgiving enough to
accept +5/0 but others aren't.  Another terminal might work better.
-- 
John R. Levine, Segue Software, POB 349, Cambridge MA 02238, +1 617 492 3869
{ bbn | spdcc | decvax | harvard | yale }!ima!johnl, Levine@YALE.something
Massachusetts has 64 licensed drivers who are over 100 years old.  -The Globe