Thanks, I've seen the Rockwell wafers on ebay + chipscapes (Steve Emery sent me some nice photomicrographs) but was wondering what the difference was on MOS Technology wafers. WorthPoint (archived eBay listings) had a 6510 wafer listing: https://www.worthpoint.com/worthopedia/silicon-wafer-mos-6510 ...

Just curious -- are there any MOS 65xx processor wafers still in existence somewhere, like a museum?

I am interested in how many die per wafer and what the process control monitors (test structures in place of a die) contained.

Oh, also, probably better to call the 7 numbered things masks, rather than layers.

Done.

I tried measuring in 6 places and got the following poly widths (through my crude eyeballing method), where "nm" is whatever scaling factor is applied on the image. The whole die is about 39550 x 43840 "nm ...

Just so I get the photomicrograph interpretation right, here's an annotated image of that area (rotated the "right way" with decode ROM PLA at top, control logic in middle, registers at bottom, text right side up)

http://forum.6502.org/images/migrated/090058-000.png


the funny submarine-with ...

BTW Antoine Bercovici (@siliconinsid) posted a hi-res photomicrograph of a white-package 6502 rev A a few months ago on https://siliconpr0n.org/archive/doku.php?id=bercovici:mos:6502a (interactive viewer at https://siliconpr0n.org/map/mos/6502a/mz/, twitter announcement: https://twitter.com ...

fyi Visual6502's slide presentation shows a plastic chip labeled "MOS 6502 1683" = 16th week of 1983. Not sure if that is a rev D. (I wish they'd documented which chip they used a little more carefully!)

Walt Eisenhower's resume on team6502.org says:


Oct. 1979 to present - MOS Technology, Inc ...

Segher has written up some of his findings on the visual6502 wiki.

That link (and the whole 6502 wiki) is unfortunately nonfunctional, but thankfully archive.org captured it; the latest capture was in April 2021:

https://web.archive.org/web/20210405071423/http://visual6502.org/wiki/index.php ...

Thanks for the reply!

Welcome! Yes, the various microphotographs of original 6502 die will tell you something about the process size.

Previous calculations suggest 5 micron for the 6502 captured for the visual6502 project.

Segher has said:
There's a good image of the die still in the package on ...

Hi there-- I'm writing an article for my engineering blog, and one section of it is on the 6502.

Does anyone know if there is reliable information about the process geometry of the original 6502 from 1975? Wikipedia mentions 8 micron, but the source is a brief note on a Sun Microsystems webpage by ...