Apple 1 correct MCS6502 on eBay

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Joined: Oct 9 2011
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Re: Apple 1 correct MCS6502 on eBay

To be clear it is the correct package for the pre-NTI Apple-1.

The NTI used the "spider" leg 6502. Also we don't know maybe the later byte shop did, no one knows.

This 6502 on eBay is very very rare and does have the ROR bug. So is valuable to chip collectors as well. Is it worth that much, the last one went for almost 2k over a year ago... So maybe.... If you had a real byte shop A1 missing the 6502, the definitely.

Cheers,
Corey

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Re: Apple 1 correct MCS6502 on eBay

Same seller has the correct 6820 for all types of Apple-1

http://pages.ebay.com/link/?nav=item.view&alt=web&id=191520699618

This one I'm torn about. The price is high for a plastic chip, but it's a rare chip.

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Re: Apple 1 correct MCS6502 on eBay

Actually, that's not quite the correct 6820. The embossed AMI logo on the Apple 1 6820s is different. This one has the A,M,I letters all in a row, wheras on the Apple 1 chips the letters in the logo are in a different arrangement with the A on a separate line to the M and I.

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Re: Apple 1 correct MCS6502 on eBay

Not to mention the price is ridiculous for a chip with a missing leg...

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Re: Apple 1 correct MCS6502 on eBay

Missed the fact it's missing a leg...

I could have sworn I saw an NTI board with the horizontal embossed NTI logo. Maybe it was a replacement.

Anyone out there with an original Apple-1 with the logo similar to this chip?

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Re: Apple 1 correct MCS6502 on eBay

This looks like one, assuming it is not a replacement, but it is black not grey: http://4.bp.blogspot.com/_zxI22dsOsAo/S5B-X0UKw8I/AAAAAAAAAbU/URE_2ErXPnk/s1600-h/Picture+2.png

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Re: Apple 1 correct MCS6502 on eBay

That must be a replacement, the 6502 has been replaced on that. The 6820 is connected to the outside world, so they can go bad or be "borrowed".

I might be wrong, I looked at all my pictures of systems I have worked on that have original 6820 chips and they all have the AMI logo arranged in a circle.

Specifically they all are very early 1976, Like first week kind of early of the S6820. So it could be the date or the specific foundry that made it had the different logo.

Cheers,
Corey

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Re: Apple 1 correct MCS6502 on eBay

Then there is this one also listed for the same price: http://www.ebay.com/itm/291392182106

My understanding based on previous discussions is that it is too early for the non-NTI Apple 1 as it has the gold cap on it.

Interestingly, the S6820 has sold at the asking price, apparently.

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Re: Apple 1 correct MCS6502 on eBay

Another AMI 6820 on ebay: http://www.ebay.com/itm/231523690807?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_sacat%3D0%26_nkw%3D231523690807%26_rdc%3D1.

Its a '77 instead of a more desirable '75 or '76, and it has the one line AMI Logo instead of two, but it is as close as many of us will get....

(I have no affiliation with the seller).

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Re: Apple 1 correct MCS6502 on eBay

ChristopherB wrote:

Then there is this one also listed for the same price: http://www.ebay.com/itm/291392182106

My understanding based on previous discussions is that it is too early for the non-NTI Apple 1 as it has the gold cap on it.

Interestingly, the S6820 has sold at the asking price, apparently.

The earliest batch of Apple 1 boards used the gold cap MOS 6502. Paul Terrell's Byte Shop images of the early Apple I's show the gold capped chip. You can see this on the second image at the link below, just visible under the keyboard cable ribbon: http://techland.time.com/2012/11/22/behold-some-of-the-first-apple-computer-photos-ever/

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Re: Apple 1 correct MCS6502 on eBay

The Paul Terrell pictures are of a pre-production prototype. There is no solder mask, and some traces are different. I believe that the edge connector received regulated +/- 12 on that board. The location of that board and any other, if there were any more, from the same batch are unknown (at least to me). Early production Byte Shop boards with known original 6502's include Wendell Sander's, which is not gold topped. Unfortunately, Liza Loop's board has had the 6502 replaced.

regards,
Mike Willegal