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UNIVAC-1050-4k-CORE-MEMORY-STACK-7-planes
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Details about  UNIVAC 1050 4k CORE MEMORY STACK 7 planes

UNIVAC 1050 4k CORE MEMORY STACK 7 planes

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Item condition:
--not specified
Price:
US $399.95
 
22 watchers
 
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Item location:
Pittsburgh, Pennsylvania, United States
 
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Returns:
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eBay item number:
300630568239
Seller assumes all responsibility for this listing.
Last updated on  May 15, 2014 12:11:17 PDT  View all revisions

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RARE !

UNIVAC 1050 Core Memory Stack

 



Presented for Buy-It-Now is a Complete 4k Core Memory stack for the Univac 1050 Processor. The Univac 1050 was a mid range mainframe computer. It used discrete transistors to make up the logics. Core memory was it's only internal memory. This CPU was a 6 bit octal satellite computer for the Univac III, from the mid 1960's. The first three images presented are of the item for sale, the remaining images are from previous listings. Please click on the thumbnails to enlarge the images.





I was a Senior Systems Engineer for Univac in Philadelpia Pa. for many years beginning in 1968 to the 80's. I saved this core stack after a swap out for an intermittant problem. We later realized the problem was not in the memory. The problem wound up being in the backboard wiring. Anyway, I saved this stack all these years and now haved decided to sell this to a new home where, hopefully, it'll be appreciated. This item is believed to be a working unit, subject to age and having the correct Univac 1050 CPU to run it in. Note that the retainer at the upper center is missing. I can't remember that we locked these in while the system was operating. This is the last stack I own, one was previously sold.

The Univac 1050 had up to 8 seven bit core memory stacks, each containing 4092 locations which gave the system a maximum of 32k of memory. One unit came standard with the processor purchase and the other 7 were features available for purchase at $10,000 per 4k stack. I sold one of the memory stacks for auction in a previous eBay listing. The computer was released in, I believe, 1965. and the drawings are dated 1962 thru 1965.



To the right is an image showing the stack I sold sitting on the engineering drawing, a part of a seperate listing, showing the layout of the 8 memory stacks. This processor used 6 bit octal memory locations which allowed for up to only 64 different characters to be represented. Thus lower case characters didn't exist. The computer used 5 adjacent memory locations to make up a 30 bit instruction word. The computer did arithmetics in decimal or in binary. The Univac 1050 was designed as a satelite to the much larger Univac 3 and many of those that I knew were in IT departments that owned both systems.





I tried to present pictures capable of presenting the condition of the item so that you can make your own decision as to whether this is suitable for your collection. The logic manual is NOT included in this auction. The Logic Manual, is for sale in another (SOLD) eBay listing. This listing is for one 4k Core memory stack as pictured in the first three pictures

Buy-It-Now only $399.95.





For international shipping we must insist on insuring all packages. All international orders will be shipped by United States Post Office Priority Mail International. That shipping service includes free insurance for at least $68 and increases based on weight. No other nsurance is available. We will give the postal clerk the same value for insurance, and for customs declarations.







We will cancel bids for any bidder with negative feedback or with multiple recent negative feedbacks. We reserve the right to cancel bids from those with private feedback.
The pictures in this listing and the page design are copyrighted by John Duda, 2007, 2011. We will bill for any unauthorized use. In addition we will notify appropriate authorities of the fraudulent use of our images to misportray your item for sale on this site.



The following image is for illustrative purposes only and bears no resemblence to the item being auctioned here. The illustration is from a Univac training manual on the Univac 7013 memory, a much larger much faster memory. Click to enlarge.

 

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Shipping and handling

Item location: Pittsburgh, Pennsylvania, United States
Shipping to: United States, Europe, Asia, Canada, Australia
Excludes: Africa, South America, Russian Federation, Bulgaria, Romania, Thailand, Vietnam, China, Iraq, Mexico
Handling time
Will usually ship within 1 business day of receiving cleared payment[newWindowTxt].

Return policy

After receiving the item, contact seller within
Refund will be given as
Return shipping
30 days
Money back
Buyer pays return shipping
Return policy details
This item carries a Full 30 day guarantee, if returned in the same condition as shipped.

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Immediate payment required for this item

Immediate payment of US $399.95 is required.

Seller's payment instructions

Item must be paid for, or contact, made within 4 days to prevent a Non Paying Bidder claim with eBay.
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