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Hennes
Joined: 05 May 2022
Posts: 4
Location: JN49ES
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 Posted: Thu May 05, 2022 9:01 am Post subject: What kind of chip is the "1449 1104"? |
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Long ago, when I used to recycle old computer systems, I pulled out the memory chips "for further use". Now, 40 years later I still have that cardboard box of memory chips, mostly MM2102A type (some of them labeled "1449 1112" with the intel logo at the left side). I'm dreaming of a nice CP/M computer, 4 kB per ECB-card, 16 cards for 64kB, 10A current consumption... 
But some of the chips are labeled "1449 1104". Has anyone an idea, what the heck that is? The chips have 16 pins, and two lines on the top
1449 1104
S 7650 CK280
The "S" in the second row is a company logo, but I don't know which one.
on the back side are also two rows:
82S10
FY4VC
Any hints?
Ralf
Last edited by Hennes on Thu May 12, 2022 4:29 am; edited 3 times in total |
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Guest
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| Posted: Wed May 11, 2022 8:17 pm Post subject: S logos |
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Hi Ralf
It might help if you were to post photos of those chips, as they could be easier to identify that way.
As to the S logo... there was more than one company that used an S, so again... photos could help.
Some S logos are from a few well-known companies [Signetics, Siemens, Siliconix], but there might be S logos from others?
DM8800'er |
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DM8800er
Joined: 28 Jun 2012
Posts: 279
Location: California
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| Posted: Wed May 11, 2022 8:20 pm Post subject: |
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lol
thought I was signed-in when I sent that
DM8800'er |
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Hennes
Joined: 05 May 2022
Posts: 4
Location: JN49ES
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| Posted: Thu May 12, 2022 4:23 am Post subject: |
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Looking at your logos, I'd say Signetics.
I added images into my original post. |
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gekaufman
Joined: 08 Dec 2014
Posts: 385
Location: New Hampshire, USA
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| Posted: Thu May 12, 2022 5:59 am Post subject: |
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82S10 is a Signetics 1024 x 1 bipolar ram (open collector)
+5v, ttl compatible. |
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Hennes
Joined: 05 May 2022
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Location: JN49ES
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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Hennes
Joined: 05 May 2022
Posts: 4
Location: JN49ES
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| Posted: Tue May 31, 2022 12:32 pm Post subject: |
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Finally got some time to rewire my arduino powered chip tester for this kind of memory chip. At first it reported only errors. But then I checked the manual more carefully and found out, this chip has o.c. output. So I wired a 5k1 resistor from Dout to +5V and finally the test was positive.
Thanks for your help! |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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