Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: $Revision: 1.6.2.16 $; site ima.UUCP
Path: utzoo!linus!philabs!cmcl2!seismo!harvard!think!ima!johnl
From: johnl@ima.UUCP
Newsgroups: net.micro.pc
Subject: Re: Does DOS listen to LaserJets?
Message-ID: <103700004@ima.UUCP>
Date: Thu, 1-Aug-85 16:29:00 EDT
Article-I.D.: ima.103700004
Posted: Thu Aug  1 16:29:00 1985
Date-Received: Sat, 3-Aug-85 20:36:47 EDT
References: <596@alberta.UUCP>
Lines: 15
Nf-ID: #R:alberta:-59600:ima:103700004:000:706
Nf-From: ima!johnl    Aug  1 16:29:00 1985


/* Written  7:46 pm  Jul 25, 1985 by andrew@alberta in ima:net.micro.pc */
> Does anybody out there have an HP Laserjet printer hooked up to their
> PC/XT/AT?  If so, does DOS notice when the printer hangs?

The laser jet seems to use all known forms of flow control, simultaneously.
It sends xon/xoff, and also raises and lowers DTR.  The IBM BIOS doesn't
know anything about xon/xoff, but it slavishly follows DTR.  If you're
having flow control problems, most likely your cable isn't bringing the
flow control signals through.  The laser jet manual has a detailed picture
of how the cable should be wired.

Alternatively, there are lots of xon/xoff BIOS filters floating around.

John Levine, ima!johnl