Re: Weird thing ID (core stack?)

[Tom Uban via cctalk]

Yep, looks like a CDC stack.

--tom

On 1/17/18 2:24 PM, Toby Thain via cctalk wrote:
> Hi,
>
> An acquiantance was wondering about more details on this part:
>
>   https://imgur.com/a/p1GQ2
>
> It seems to be a core memory stack? But of what type? CDC?
>
> Any info appreciated.
> --Toby
>

Re: Weird thing ID (core stack?)

[Paul Koning via cctalk]

> On Jan 17, 2018, at 3:58 PM, Christian Kennedy via cctalk 
>  wrote:
> 
> 
> 
> On 1/17/18 12:24 PM, Toby Thain via cctalk wrote:
> 
>> It seems to be a core memory stack? But of what type? CDC?
> 
> Almost certainly a 6000-series core memory "block" from a PP. 

6000 series central memory uses the same memory blocks, in groups of 5 to make 
up 60 bit words, 4kW per bank, 32 banks in a fully loaded 6600 (128 kW).

paul

Re: Weird thing ID (core stack?)

[Christian Kennedy via cctalk]

On 1/17/18 12:24 PM, Toby Thain via cctalk wrote:

> It seems to be a core memory stack? But of what type? CDC?

Almost certainly a 6000-series core memory "block" from a PP. They
measured 6.75 by 6.75 by 3.625 inches tall, so you might check to see if
the dimensions match...

-- 
Christian Kennedy, Ph.D.
ch...@mainecoon.com AF6AP | DB0692 | PG00029419
http://www.mainecoon.comPGP KeyID 108DAB97
PGP fingerprint: 4E99 10B6 7253 B048 6685 6CBC 55E1 20A3 108D AB97
"Mr. McKittrick, after careful consideration…"

Re: Weird thing ID (core stack?)

[Paul Koning via cctalk]

The marking on the connector certainly says CDC.  And the next to last picture 
shows a black faceplate that pretty much matches what you see in 6000 
computers.  Look in the Thornton book 
(http://www.bitsavers.org/pdf/cdc/cyber/books/DesignOfAComputer_CDC6600.pdf 
) 
which shows a photo on page 31.  Two connectors, 30 pins each in 2 rows of 15 
matches what those memories use.

You could confirm it further by looking at the number of core planes in the 
stack.  The 6000 memory modules use 12 planes for the 12 bit PPU words (5 
memory units combine to make the 60 bit CPU word).

Finally, if you're inclined to take off some covers so you can look at the 
memory plane, the fact that it has 5 wires per core (x, y, x inhibit, y 
inhibit, and sense) is distinctive.  Most other memories have only a single 
inhibit wire per core, not two.  The details of how this is used are in chapter 
4 of 60147400A_6600_Training_Manual_Jun65.pdf which you can find on Bitsavers.

paul

> On Jan 17, 2018, at 3:24 PM, Toby Thain via cctalk  
> wrote:
> 
> Hi,
> 
> An acquiantance was wondering about more details on this part:
> 
>  https://imgur.com/a/p1GQ2
> 
> It seems to be a core memory stack? But of what type? CDC?
> 
> Any info appreciated.
> --Toby