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hugo929
Joined: 27 Oct 2006
Posts: 6163
Location: China
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 Posted: Fri Sep 30, 2011 10:31 pm Post subject: Question on ES datecode |
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Hi I recently come across a few ES were made right after the production date. They looks fine but I cannot explain the datecode issue.
I did not buy them so I prefer not to post pictures.
I just ask questions:
Do you believe a Intel A80386DX-20 ES was made at 1991? While there are mass product of DX-20 at 1989. And Even a lot kinds of A80486 production were made between 1989~1991.
Another is AMD 486DX4100-V16BGC ES, its datecode is also far behind some normal productions of the same kind, which I mean same suffix and same stepping. 
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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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| Posted: Fri Sep 30, 2011 11:03 pm Post subject: |
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Intel 386DX-20 was made until 2007 and I have seen personally seen examples of 2002 production
just not sure when the final stepping first came out
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hugo929
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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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| Posted: Fri Sep 30, 2011 11:14 pm Post subject: |
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well there is 4 known listed in CPU-World info pages
but an ES could also be for other reasons like a die shrink
can you post a picture of the bottom at least and see if die cap matches time period
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hugo929
Joined: 27 Oct 2006
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| Posted: Fri Sep 30, 2011 11:32 pm Post subject: |
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the marking on top:
A80386DX-20 IV
Q328
L1335671
i M C 1985 1987
the marking on bottom:
91079191NE
MALAY
131
DB
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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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| Posted: Fri Sep 30, 2011 11:38 pm Post subject: |
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markings look all good
this really looks like a qualification rather than a Engineering sample
found references to these.. so I would go for it
A80386DX-16 Q327
A80386DX-20 Q328
A80386DX-25 Q329
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gshv
Joined: 01 Feb 2003
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| Posted: Fri Sep 30, 2011 11:49 pm Post subject: |
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I agree. It looks like qualification sample.
Gennadiy |
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hugo929
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Neon_WA
Joined: 08 Nov 2008
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| Posted: Sat Oct 01, 2011 12:18 am Post subject: |
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could be just a minor stepping change
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