Kearney & Trecker Core memory, may be PDP8

[Anders Sandahl]

Hello,

Here is some hi resolution pictures on front/back of a MM8-AB 16K core.
Fits perfectly in a PDP-8a that has the correct power supply (G8018).

http://www.abc80.net/docs/pdp8/pdp8a/DSC_2252.JPG
http://www.abc80.net/docs/pdp8/pdp8a/DSC_2253.JPG

The picture on ebay is really bad, but you can see that it is the same.

/Anders

> Message: 5
> Date: Wed, 12 Nov 2014 08:47:37 +0100
> From: Mattis Lind <mattislind at gmail.com>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> 	<cctalk at classiccmp.org>
> Subject: Re: Kearney & Trecker Core memory, may be PDP8
> Message-ID:
> 	<CABr82SLXMERy5JWVtoCvpC07EuLJydYLvcEuGEaTyU=QHB00Xw at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> This is another Ebay item which seems to be identical :
> http://www.ebay.com/itm/DEC-H219B-16K-x-12-Core-Memory-Stack-Board-Flip-Chip-PDP-two-board-set-/151472858658?pt=BI_Control_Systems_PLCs&hash=item23447c6622
> .
>
> Also indicate PDP8/a system core mem, MM8-AB.
>
> 2014-11-12 8:41 GMT+01:00 Mattis Lind <mattislind at gmail.com>:
>
>> Looking at page 3-17 of
>> http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8a/EK-8A001-OP-002_PDP-8A_Operators_Handbook_Sep76.pdf
>> shows that it is as far as I can see identical to the 16 k MM8-AB.
>>
>> 2014-11-12 8:13 GMT+01:00 Paul Anderson <useddec at gmail.com>:
>>
>>> pic #4 shows a DEC core sticker on the back, but out of focus.
>>>
>>> On Wed, Nov 12, 2014 at 1:09 AM, jwsmobile <jws at jwsss.com> wrote:
>>>
>>> >
>>> > On 11/11/2014 9:12 PM, Jon Elson wrote:
>>> >
>>> >> On 11/11/2014 09:18 PM, Johnny Billquist wrote:
>>> >>
>>> >>> On 2014-11-12 04:00, Jon Elson wrote:
>>> >>>
>>> >>>> On 11/11/2014 07:33 PM, jwsmobile wrote:
>>> >>>>
>>> >>>>> I can't tell for sure, but this auction may be for  PDP8 core
>>> board.
>>> >>>>>
>>> >>>>> KT-KEARNEY-TRECKER-ASSY-KT83-0933-KT84-020-SYSTEM-BOARD
>>> >>>>>
>>> >>>>> http://www.ebay.com/itm/181565552717
>>> >>>>>
>>> >>>>>
>>> >>>>
>>> >>> The fact that the board have four edge connectors and not six
>>> totally
>>> >>> excludes PDP-11.
>>> >>>
>>> >> The first and last picture of the ebay listing above clearly has SIX
>>> edge
>>> >> connectors.
>>> >> And, in fact, a number of PDP-11 peripheral boards had only 4
>>> connectors.
>>> >> CPU boards and memory did usually have 6.
>>> >>
>>> >> Jon
>>> >>
>>> >>
>>> >>  I based my PDP8 on googling and looking for comments about the
>>> processor
>>> > type.  There was a history page which said they used PDP8s in their
>>> > designs.  I know that the 6 up is more common for PDP11, but wanted
>>> to
>>> > throw it out there.  I figured a core board of the right variety for
>>> $195
>>> > might be a steal since the seller didn't list it to be on the DEC
>>> hardware
>>> > searches on Ebay.
>>> >
>>> > Thanks for Al's comment on the 6800 board.  I see about half of all
>>> photos
>>> > being crap these days on ebay.  I was crossing fingers it would be a
>>> design
>>> > that started out as an actual dec, and maybe had a small board built
>>> up
>>> > with a Harris pdp processor on it.  I know that is a really long
>>> shot,
>>> but
>>> > not impossible.
>>> >
>>> > thanks for the comments.
>>> > Jim
>>> >
>>>
>>
>>
>