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From: hundt@occlusal.rutgers.edu (Thomas M. Hundt)
Newsgroups: comp.os.minix
Subject: Re: Hooking up a HP terminal to Minix 1.4a
Keywords: HP2392A PC-Minix1.4a
Message-ID: <Sep.11.15.53.54.1989.6550@occlusal.rutgers.edu>
Date: 11 Sep 89 19:53:54 GMT
References: <890@eutrc3.urc.tue.nl>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 14

Wim van Dorst:
|I can connect the terminal to a modem, works fine
|I can connect the modem to /dev/tty1, works fine
|I can connect the terminal to /dev/tty1, nothing

You need a null modem between terminal and PC.

Reason is (basically) that wires 2 and 3 in the RS-232 cable
need to be switched (one is Transmit Data, one is Receive Data). 
The terminal and PC both are wired similarly and thus conflict. 
Note that this is a simplified description; there are also
handshaking lines that need to be taken care of. 

-Tom Hundt