DEC 11/70...

From: Jack Harper <>
Date: Mon Apr 6 08:56:01 1998

Hello all...

A couple of weeks ago, I put out an e-mail to the List that mentioned that
a friend had given a DEC PDP-11/70 (or so he thought) to me that had been
'hardened' by Schlumberger for use in the oil patch. The machine supposedly
works and weighs close to 200 lbs. The oldest board claims, I think, to
have been built in late 1978.

I know practically nothing about the PDP series and so don't have the
foggiest as to what I really have.

Finally, over the weekend, I was able to open the box (1/4" armored steel
ugly thing) and take a look at the boards -- there are a total of ten as
follows: (Keep in mind that I don't know what typical DEC parts numbers
look like -- I think that a lot of the numbers that I wrote down are
actually production lots etc):

(1): Obviously a CPU board -- AH13Z-06. Also claims DEC P/N 1216988. Has a
15MHz crystal and is 15.5x8" in size. It has edge connectors (as do all of
the boards).

(2): 'Bootstrap Terminator' - DEC-81. 5013263C-P2. 8x5".

(3): 'Flip Chip" 5008691 PCC-1Vo. 2.5x2". This is some sort of jumper board.

(4): 4MB(?) DRAM. DEC P/N 1216988 (notice that this is the same p/n as the
CPU board -- that is, I suppose?, the system part number), A88D30824
RA1-RA3: RM8-3.3Kx3 (probably a component label for a resistor pack but not
sure); C:TD104/5DX92 AH12Z-12. 15.5x8".

(5-9): H-236341 EXT BRD 10.5x8". These appear to be extendor boards that
bring +15VDC and a few timing signals out to the edge of the cage -- why
there are five, I cannot imagine...

(10): "FLIP CHIP". FEB 78 SCO/R1L OPTION M7856 H236602 -01048. 10.5x8"
This appears(?) to be possibly an I/O controller board of some sort...

Does anyone have any idea of what these things came out of?

They are free to a good home -- preferably someone that can actually use
them and put them back to work (can you imagine how boring it would be to
madly process seismographic data for 20-years -- I bet they would like to
try something different for a change) (postage + packing costs).


Jack Harper (Friend to all things Symbolics)

Jack Harper Bank Systems 2000, Inc.
303-277-1892 Golden, Colorado USA

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Received on Mon Apr 06 1998 - 08:56:01 BST

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