Testing very old SRAM chips

Discussion in 'Programmer's Corner' started by eyewonder, May 22, 2011.

  1. eyewonder

    Thread Starter New Member

    Oct 21, 2009
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    I need to be able to test some VERY old SRAM chips - HM-6508-9. These are 1K x 1 chips, 16 pin.

    Anyone know of an old (or new) tester that can handle these ancient things?

    Cheers,
    Steve
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
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    I would think this would be a simple task for a microcontroller application. It would not require very fancy programming at all
     
  3. eyewonder

    Thread Starter New Member

    Oct 21, 2009
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    0
    I have thought about building my own tester, but most of my projects take a looooooong time to complete. This is for work, to repair a down machine that should be in production, making money for the company. So time involved is definitely an issue here.

    I was hoping that someone had had experience using an old programmer, possibly one of the old JDR MTC series, or Needham's.

    Cheers,
    Steve
     
  4. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Once you are talking "money and company" it's probably best just to buy some new chips and replace them. Even if to replace some chips in banks (if there are a lot) as an aid to testing.
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    Those sound a lot like what the old Commodore PET's used to use, though I'm not sure. Those old computers used to go through RAM, and it didn't help they used a number that was later used for another chip. Made the old RAM unobtainium.
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Exactly what are you testing? Just the ability to store and retrieve bits, or are you also checking timing?

    Either way it isn't hard to do. I did it a few years back with a 3-byte ISA card plus a few monostables to force the read and write timing to just under the spec minimums.
     
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