Re: PDP 11/24 VS 11/44

Article View: comp.sys.dec

Article #2127

#2127

From: Mike Young
Date: Wed, 26 Sep 1990 13:54

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In article <1990Sep25.201504.5605@uunet!konkord> jar@konkord.uucp (John Roberts) writes:
>
>	PDP users of the world:
>
>		Does anyone know which is the faster/better machine?
>		(The 11/24 or the 11/44)?
>
>	Is it possible to take out all the 11/44 boards and replace them
>	with the 11/24 boards? Are the backplans compatable?
>
>	What does it mean when the DC ON light blinks and its NOT the
>	power suppy. Why does the DC ON light blink when grant cards
>	are not there/or not in the slot?
>

	First of all, sounds like you need to subscribe to the info-PDP11
mailing list - a mail-oriented newsgroup composed of those of us that still
have to deal with PDP11 stuff. Send a note to info-pdp11-request@transarc.com,
asking to be added to the mailing list. Re-posting your request to that
group will undoubtedly generate a useful reply! (The posting should be
mailed to info-pdp11@transarc.com.)

	I can give you some brief info here. The blinking DC ON light is indeed
power supply problems, but not necessarily +5. Could be +/- 12, or +/- 15
as well. The 11/24 and 11/44 do not share backplanes. They may look alike,
but they are wired completely differently. DO NOT try to put an 11/24 CPU
board into al 11/44 backplane, or vice versa. The 11/44 CPU is actually about
six hex boards; the 11/24 CPU is one board. 

	The DC ON light should not be affected by presence/absense of grant
cards.

	I have two 11/44s, and one 11/24. The '24 is in standby mode, in case
one of the 44s dies (11/44 is a lot faster than the 24, and can do split I/D).


>	Sorry for all the questions...

	No problem! 

>
>-- 
>John A. Roberts				(508)460-4646 X197
>Concord Communications, Inc.			uunet!konkord!jar
>753 Forest Street					or
>Marlboro, MA 01752, USA				jar%konkord@uunet.uu.net



--
    |  Mike Young KA9HZE                |       young@ecn.purdue.edu    |
    |  Purdue University EE Dept.       |       ...!pur-ee!young        |
    |  W. Lafayette, IN  47907          |                               |
    _____________________________________________________________________

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!aplcen!samsung!noose.ecn.purdue.edu!dynamo.ecn.purdue.edu!young
From: young@dynamo.ecn.purdue.edu (Mike Young)
Newsgroups: comp.sys.dec
Subject: Re: PDP 11/24 VS 11/44
Message-ID: <1990Sep26.135406.21647@ecn.purdue.edu>
Date: 26 Sep 90 13:54:06 GMT
References: <1990Sep25.201504.5605@uunet!konkord>
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Organization: Purdue University Engineering Computer Network
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