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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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 Posted: Tue Sep 12, 2017 10:38 pm Post subject: 1971 Intel Grey Trace RAM chips w. Custom Numbers |
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I just got these 2 Burroughs boards at the Vintage Computer Fest-Mid West that was held near Chicago this past weekend.
These early (1971) RAM chips have custom part number 1534-9582 and the early "intel" logo.
Does anyone know what the actual Intel part number is??
I Googled the number and only found that this is a Burroughs number for a RAM chip.
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gekaufman
Joined: 08 Dec 2014
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Location: New Hampshire, USA
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johnorun
Joined: 04 Apr 2008
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Location: Chicago, IL- US
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gekaufman
Joined: 08 Dec 2014
Posts: 385
Location: New Hampshire, USA
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| Posted: Wed Sep 13, 2017 10:26 am Post subject: |
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The power supply lines are often thicker, and will have bypass capacitors. If you find an electrolytic or tantalum capacitor they will be polarized and have markings to indicate the +/-.
Looks like a capacitor in the top left (silver) of the first photo (for sale 005.JPG). Follow the tracings from the + and - terminals along to the memory IC's and see what pins they go to.
- Gary |
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alexander
Joined: 08 Aug 2007
Posts: 131
Location: Strasbourg France
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| Posted: Wed Sep 13, 2017 12:47 pm Post subject: |
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Hello John
I think it is a 1101 256x1 Static Ram used on some local memory in the B1700 System. The Texas chip on the Jpeg can be an Shift register on the disk subsystem.
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Mon Oct 23, 2017 7:09 am Post subject: |
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I'm so envious YOU can gi there eyery year. The year I was in Chicago the fest was a week after I left:-((
Nice barbecue anyway, John:-)
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Mon Oct 23, 2017 10:05 am Post subject: |
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| wepwawet wrote: | I'm so envious YOU can gi there eyery year. The year I was in Chicago the fest was a week after I left:-((
Nice barbecue anyway, John:-) |
This was the first time I attended VCF-MW in 3 years and I got lucky. The Fest has grown much bigger and now attracts visitors from other countries.
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johnorun
Joined: 04 Apr 2008
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Location: Chicago, IL- US
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| Posted: Mon Oct 23, 2017 10:08 am Post subject: |
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Thanks to all repliers.
If anyone can show more evidence that these are C1101's, I would really appreciate it!
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