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MOS MCS 6501 CPU on Ebay - Apple-1 Spec

tcolegrove

Member
Joined
Jun 19, 2019
Messages
44
Location
Boston, MA
Hey all. I just listed an extremely rare MOS MCS6501 CPU on Ebay. Penny auction no reserve. https://www.ebay.com/itm/265718367024

"The MCS6501 is a first and very rare member of the MOS Technology 65xx CPU family. Introduced in 1975 with the MCS6502 to MCS6505, it was pin compatible with the Motorola 6800 and, after legal issues, was not produced afterwards. This particular example is date coded 4575, the 45th week of 1975. The chip is in excellent cosmetic condition. No testing has been done on the chip due to its rarity. It is sold AS-IS with no guarantee that it is operational.

The MCS6501 was sold with very few microcomputers of its day. The Digital Group and Ohio Scientific sold CPU boards that were compatible and Apple Computer famously specified the MCS 6501 as one of three CPU's compatible with the Apple-1 alongside the MCS6502 and Motorola 6800. According to Steve Wozniak the earliest prototype Apple-1's were built using the 6501 for testing purposes.

I purchased this CPU from the estate of David Towson of Baltimore, MD. David spent his career at the Department of the Army Signal Corps where he purchased it, along with several others, from his co-worker Bob Winterhalter sometime in 1977. Bob Winterhalter passed away 12/27/2010. According to handwritten notes that accompanied the CPU, it was tested good 10/7/77. It's unclear what Mr. Towson had hoped to do with the 6501's, but according to a note submitted to Bucknell University by his friend Bob Nevin, David was, "an engineer who never fails to impress me with his grasp of electronic circuits and never fails to amaze me with his ability to build them and make them work." According to Bob Nevin, David was a ham radio enthusiast in his spare time."
 

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Gary C

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May 26, 2018
Messages
1,520
Location
Lancashire, UK
While its crazy, its a piece of history and an auction as such might never be seen again for a working 6501.

Pointless ?, maybe, but I think we all can understand the desire to own something like this.

Problem comes when its price becomes a liability. I have a car I bought for not a great deal, its now worth almost 10 times as much, which does limit my enjoyment as I never really drive it.
 

VERAULT

Veteran Member
Joined
Jan 30, 2012
Messages
5,534
Location
Connecticut, USA
While its crazy, its a piece of history and an auction as such might never be seen again for a working 6501.

Pointless ?, maybe, but I think we all can understand the desire to own something like this.

Problem comes when its price becomes a liability. I have a car I bought for not a great deal, its now worth almost 10 times as much, which does limit my enjoyment as I never really drive it.
I get it. This is the first 6501 I have ever seen listed or referenced.

Jaguar?
 
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