Re: 9600 bps bottleneck on Laserwriter Plus

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#1493

From: C.E. Thompson
Date: Thu, 11 Jan 1990 15:14

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In article <21091@pasteur.Berkeley.EDU> hastings@hemlock.Berkeley.EDU (Mark Hastings) writes:
>Has anyone heard of another "safety valve" feature of the Laserwriter
>that allows you
>to reset the EPROM settings in case you accidentally screw up the baud
>rate?  I've
>been reluctant to try any of these speedups unless I knew I could return
>things to
>normal if problems arose (and finding a 9-pin serial cable for our sun
>would take
>a long time).
>

That's what the "1200" position of the four-position switch is for.
Setting the switch in this position causes it to ignore the eeprom settings,
and drive both serial ports at 1200 baud, parity ignored. Provided that
you can drive the connection with these options, you have a way of backing
off from bad eeprom settings.

Chris Thompson
JANET:    cet1@uk.ac.cam.phx
Internet: cet1%phx.cam.ac.uk@nsfnet-relay.ac.uk

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References: <1200@cernvax.UUCP> <3495@hub.UUCP> <1990Jan10.042555.19571@grian.cps.altadena.ca.us> <21091@pasteur.Berkeley.EDU>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!mcsun!ukc!cam-cl!cet1
From: cet1@cl.cam.ac.uk (C.E. Thompson)
Newsgroups: comp.lang.postscript
Subject: Re: 9600 bps bottleneck on Laserwriter Plus
Message-ID: <1724@gannet.cl.cam.ac.uk>
Date: 11 Jan 90 15:14:59 GMT
References: <1200@cernvax.UUCP> <3495@hub.UUCP> <1990Jan10.042555.19571@grian.cps.altadena.ca.us> <21091@pasteur.Berkeley.EDU>
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Reply-To: cet1@cl.cam.ac.uk (C.E. Thompson)
Organization: U of Cambridge Comp Lab, UK
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