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antique
Joined: 12 Jun 2018
Posts: 17
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 Posted: Mon Jul 23, 2018 10:01 am Post subject: Strange Intel C8086 with black square lid. |
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C8086 with black square lid? I've got this chip recent.
This C8086 with square lid is not the same as picture of C8086 I've seem on Internet.
Last edited by antique on Mon Jul 23, 2018 10:17 am; edited 2 times in total |
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antique
Joined: 12 Jun 2018
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| Posted: Mon Jul 23, 2018 10:06 am Post subject: |
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| More photo of this strange C8086 chip. |
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antique
Joined: 12 Jun 2018
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| Posted: Mon Jul 23, 2018 10:10 am Post subject: |
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| More photo of this strange C8086 chip. |
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CHips
Joined: 01 May 2016
Posts: 834
Location: Switzerland
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| Posted: Mon Jul 23, 2018 10:26 am Post subject: |
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2 Sspecs are known for a standard Intel C8086, S2829 and S2864.
It seems that most of the C8086 that we can find via Google Images are S2864, which all seem to have a rectangular lid.
Thus, I suppose that the S2829 have square lids, and S2864 rectangular ones.
The C8086 ES also have square lids, like this one found here or this one. C8085s too.
I have a S2864 with 7832 datecode, yours is probably a bit older. Intel likely changed slightly the package between 7814-7832.
In all cases, nice find, all C8086 are very rare. S2829 seems more rare, this is the only one that I have ever seen.
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debs3759
Joined: 18 Jan 2006
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Location: Northampton, Divided Kingdom
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| Posted: Mon Jul 23, 2018 11:49 am Post subject: |
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Nice rare find 
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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antique
Joined: 12 Jun 2018
Posts: 17
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| Posted: Wed Jul 25, 2018 6:23 am Post subject: |
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| CHips wrote: | 2 Sspecs are known for a standard Intel C8086, S2829 and S2864.
It seems that most of the C8086 that we can find via Google Images are S2864, which all seem to have a rectangular lid.
Thus, I suppose that the S2829 have square lids, and S2864 rectangular ones.
The C8086 ES also have square lids, like this one found here or this one. C8085s too.
I have a S2864 with 7832 datecode, yours is probably a bit older. Intel likely changed slightly the package between 7814-7832.
In all cases, nice find, all C8086 are very rare. S2829 seems more rare, this is the only one that I have ever seen. |
You guess right. My square lid C8086 is produced between 23 weeks - 24 weeks of 1978. |
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antique
Joined: 12 Jun 2018
Posts: 17
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| Posted: Wed Jul 25, 2018 6:26 am Post subject: |
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| CPUShack wrote: | | s-spec on these is independent of package (for example I have a S2864 in a D8086) |
I can safty guess from S2865 there’s no C8086 exist.
My D8086 S2865 was produced in 39th week of 1978, this is evidence. |
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CHips
Joined: 01 May 2016
Posts: 834
Location: Switzerland
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| Posted: Wed Jul 25, 2018 12:23 pm Post subject: |
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| CPUShack wrote: | | s-spec on these is independent of package (for example I have a S2864 in a D8086) |
Interesting, I did not know that until now. In this case, I can suppose that the S2829 and S2864 in C package will still coincide with the respective square and rectangular lids, at least most of time.
| antique wrote: | I can safty guess from S2865 there’s no C8086 exist.
My D8086 S2865 was produced in 39th week of 1978, this is evidence. |
Actually, someone has a S2865 C8086-4 (7830).
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antique
Joined: 12 Jun 2018
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| Posted: Fri Jul 27, 2018 8:22 pm Post subject: |
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| CHips wrote: | | CPUShack wrote: | | s-spec on these is independent of package (for example I have a S2864 in a D8086) |
Interesting, I did not know that until now. In this case, I can suppose that the S2829 and S2864 in C package will still coincide with the respective square and rectangular lids, at least most of time.
| antique wrote: | I can safty guess from S2865 there’s no C8086 exist.
My D8086 S2865 was produced in 39th week of 1978, this is evidence. |
Actually, someone has a S2865 C8086-4 (7830). |
Exciting, Maybe D8086 and C8086 co-exist between 28th week and 30th weeks. |
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river25
Joined: 24 Dec 2018
Posts: 14
Location: Sydney, Australia
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| Posted: Mon Dec 24, 2018 2:43 am Post subject: |
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Hi,
I'm a newbie to these forums, so hello to everyone. However, I am not new to old processors as I used to collect them many years ago, and I still use them for personal enjoyment in programming and wire-wrapping things together.
Anyway, I was looking through the net for the details on a C8086 CPU I have in one of my SDK86 boards. It looks the same as the one in the above pictures, but it has the following stamped on it....
C8086
S2805
5701B
I can send a pic if you want.
Is S2805 something special or am I looking at a pretty ordinary 8086? |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Mon Dec 24, 2018 2:54 am Post subject: |
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| All C8086 are uncommon and your seems to have new s-spec, please post photos. |
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river25
Joined: 24 Dec 2018
Posts: 14
Location: Sydney, Australia
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| Posted: Mon Dec 24, 2018 2:56 am Post subject: |
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| Okay, here it is... sorry, the image is so big. |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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CHips
Joined: 01 May 2016
Posts: 834
Location: Switzerland
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| Posted: Wed Dec 26, 2018 9:57 pm Post subject: |
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Awesome find  !
And a lower Sspec should also be older, no? This would be a very early non-Es C8086, I am curious to know the date code.
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