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From: asbesto@freaknet.org (asbesto)
Subject: [TUHS] PDP11/34 boot problems, here i am again :)
Date: Tue, 15 Apr 2003 21:22:42 +0000	[thread overview]
Message-ID: <20030415212242.GA2131@freaknet.org> (raw)
In-Reply-To: <200304151942.h3FJgO900113@opihi.ucsd.edu>

Il Tue, Apr 15, 2003 at 12:42:24PM -0700, Carl Lowenstein rigurgitava:

> While you probably _do_ have a real hardware problem with the broken
> IC, I think that the red Parity Error light on first turn-on is normal
> behavior.  The MOS memory comes up with random values, and about half
> of them will have the wrong parity.  Some software routine must turn
> off parity error detection and write a known data pattern (all 0's) to
> each memory location.  I don't remember whether this is something that
> is done by the boot ROM of an 11/34.

hmmm
but running any code on the pdp11/34 (specifically, some boot 
code) will also result in the red light turn off and on again :(

-- 
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  reply	other threads:[~2003-04-15 21:22 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-04-15 19:42 Carl Lowenstein
2003-04-15 21:22 ` asbesto [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-04-15  6:37 Gooijen H
2003-04-15  8:50 ` asbesto
2003-04-15  0:00 asbesto

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