Signetics' 25120 9046xN Random Access Write-Only Memory (WOM)

Discussion in 'Off-Topic' started by SgtWookie, Aug 22, 2008.

  1. SgtWookie

    Thread Starter Expert

    Jul 17, 2007
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    Happened across this advertisement for Signetics' Write-Only Memory IC, which was published in 1972 - you guess the exact date of publication.

    A copy of it resides here: http://www.national.com/rap/files/datasheet.pdf
    Be sure to zoom in on the Block Diagram to note the handy features, and the novel Drain concept.

    The "Bit capacity vs Temperature" chart on page 2 is quite illuminating, along with the "Pins Remaining vs Number of Socket Insertions" diagram. It's too bad that more vendors don't supply this kind of data.

    Anyway, I'd been looking for just such a device for implementation of a non-intelligent microcontroller. Now if I could only find a FISH (First In Still Here) register I'd be all set.
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    Someone was bored that day, I'm guessing it was printed April 1st.
     
  3. Papabravo

    Expert

    Feb 24, 2006
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    The most useful examples of WOMs are printers, card punches, and tape punches. We don't need no steenkin' read after write. Yuuuuh!
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Now if we can only find the ad for the Electro-Voice speakers with the DC to blue light response..
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I remember seeing that when it was first printed. Reminds me of the Darkness Emitting Arsenide Diode (DEAD). I understand the yield is very high.
     
  6. Ron H

    AAC Fanatic!

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  7. RiJoRI

    Well-Known Member

    Aug 15, 2007
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    Those WOMs cost too much! I have recently discovered (4 months, 24 days ago) that I can get WOMs if I tie the /OE pin of a 27(C)xxx EPROM high! I now have a selection of WOMs from 1Kx8 (2708) to 512Kx8 (27C040)! :eek:

    --Rich
     
  8. SgtWookie

    Thread Starter Expert

    Jul 17, 2007
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    Last edited: Aug 25, 2008
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