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From: Robertdkeys@aol.com (Robertdkeys@aol.com)
Subject: [TUHS] flaky webster or sigma WQESD4 and RQD11 controllers on KA650???
Date: Fri, 13 Dec 2002 23:00:39 EST	[thread overview]
Message-ID: <102.2123e287.2b2c06e7@aol.com> (raw)

The particular webster wqesd4 I have looks like
about an '86 or so board, from chip dates, and
the main chip that is socketed is marked with
"ENGR-SAMPLE"...doh....  Maybe I do have a very
early board that won't run with a faster cpu.
The rom is a part no. 080469-01 REV 01, if that
means anything to anyone, as marked on its paper
label.  The later sigma board does not have the
problem.  Oh, well, if I have to run it with a
KA630 at slo-poke gait, so be it....(:+\\...

There are two diodes, one looks like an ordinary
silicon rectifier and one looks like a zener of
some sort, possibly, off pin 19 of the 74ls240
at position V2 on the board.  Those come off
the J6 pin 10 of 10, and are in parallel.

Thanks

Bob



             reply	other threads:[~2002-12-14  4:00 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-12-14  4:00 Robertdkeys [this message]
  -- strict thread matches above, loose matches on Subject: below --
2002-12-14  2:30 John Holden
2002-12-14  1:21 Norman Wilson
2002-12-13 19:33 Carl Lowenstein
2002-12-13 16:52 Robertdkeys
2002-12-13  7:29 Michael Sokolov
2002-12-13  5:50 Robertdkeys

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