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BigEd
PostPosted: Thu Dec 16, 2021 6:13 pm 
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Just a thought, we could collect the markings on any 65816 chips we have.

We might find for example that quite a few years of recent purchases are all from the same batch. Or that they are all very different.

Mine were bought, I think, in April 2008, or not far off. They are marked as follows:
W65C816S6PG-14
SA0627A
D1839A
Taiwan
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GARTHWILSON
PostPosted: Thu Dec 16, 2021 9:25 pm 
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I got these a couple of years ago:
Attachment:
WDC816PQFP2.jpg
WDC816PQFP2.jpg [ 106.22 KiB | Viewed 503 times ]

A couple of years before that, I got a couple of DIPs just for doing half cycle by half cycle experimenting with the various and instructions and interrupts, and years before that, five in PLCC:
Attachment:
WDC816PLCCandDIP.jpg
WDC816PLCCandDIP.jpg [ 62.83 KiB | Viewed 503 times ]

(Pardon me for not taking them out of the taped-up tubes for the picture.)

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BigEd
PostPosted: Thu Dec 16, 2021 9:50 pm 
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Thanks - I dare say BDD can tell us the difference between S6 and S8 parts.
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GARTHWILSON
PostPosted: Thu Dec 16, 2021 10:11 pm 
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I believe it's 6 microns versus 8 microns in minimum die feature size (which is huge compared to the latest 6nm stuff).

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BigEd
PostPosted: Thu Dec 16, 2021 10:15 pm 
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Hmm, much too large... the original 6502 is about 6u, and in the mid 80s I was working with 1 micron.

Here we go: it's 0.6 and 0.8 micron. Still rather large!
https://www.cpu-world.com/info/id/WDC-i ... ation.html
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GARTHWILSON
PostPosted: Thu Dec 16, 2021 10:17 pm 
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Ah yes, you're right.

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