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Help identifying IC

Discussion in 'Datasheets, Manuals and Component Identification' started by Danno, Sep 1, 2015.

  1. Danno

    Danno

    65
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    Aug 31, 2015
    Hi,
    Does anybody have any info or data sheets on this IC please? All I know is it's some kind of RAM. I have searched Google but cannot find anything on it.

    Thanks

    Snap 2015-09-01.gif
     
    Last edited by a moderator: Sep 2, 2015
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,404
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    Nov 17, 2011
  3. Danno

    Danno

    65
    2
    Aug 31, 2015
    Thank you very much,

    One thing I'm confused about is in the system I am looking at there is a note on the schematic that says "Fit 9410 when available until then use assembly 39-013-001"
    Now I know assembly 39-013-001 is a small board with a battery on and a 74C910N which plugs into IC8 socket via a flying lead, now if a 9410 is to be fitted when available (remember this is in the 1970's) how does it retain the data as the old board had a battery?
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    1,920
    Nov 17, 2011
    It doesn't. Maybe assembly 39-013-001 was simply available and the battery not really required in this application?
     
  5. Danno

    Danno

    65
    2
    Aug 31, 2015
    Battery was definitely required as the system has a data retrieval port for which data was periodically collected via hand held devices, some ROM's also monitor the battery voltage and indicate low battery via a error code on a 2 digit display.
     
  6. Old Steve

    Old Steve

    734
    169
    Jul 23, 2015
    They appear to be 2 different 9410 ICs

    I've searched high and low, but can't find a matching IC. You would expect it to be a 64 x 4-bit EEPROM, (Non-volatile static RAM), going by the address and data pins and the 'ST' (Store) pin, but did EEPROMs even exist back then? Xicor used to make some early EEPROMS, and I thought I had it when I saw an Xicor 9410, but it's a digital pot.
     
    Last edited: Sep 1, 2015
  7. Danno

    Danno

    65
    2
    Aug 31, 2015
  8. Old Steve

    Old Steve

    734
    169
    Jul 23, 2015
    Yeah, that's what I meant by "They appear to be 2 different 9410 ICs"

    It MUST be an early EEPROM, but I can't find data anywhere.
    A bit of reading tells me that EEPROMS were invented in the late '70s, so it's possible.
     
  9. Danno

    Danno

    65
    2
    Aug 31, 2015

    Ah yes I see where your coming from, if it was an EEPROM it would retain data?
     
  10. Old Steve

    Old Steve

    734
    169
    Jul 23, 2015
    Yep - Electrically Erasable Programmable Read Only Memory. They called them non-volatile static RAM, (NOVRAM or NVRAM), back then.
    I still have an Xicor X22C12P chip here, brand new, from 30+ years ago. 128 x 4-bit storage. Pretty useless nowadays, but big in their day.
    I've been using the above keywords to search, but have only come up with X22C10 and S22H10I, both 64 x 4-bit but their pinouts are different to the 9410. Still looking, though. Unfortunately, that sort of memory has pretty well disappeared into the pages of history and most never made it onto the internet.
     
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