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Thread: Erasing UV EPROMs

  1. #41
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    Quote Originally Posted by Chuck(G) View Post
    Do any newer Chinese programmers support the old 3-rail (e.g. 270 EPROMs? I've never seen one that does.
    Even my high end BP Microsystems BP-1610 device programmer doesn't support TMS2716 +5V, +12V, -5V EPROMs. Maybe someday I'll pick up a Data I/O programmer which does.

  2. #42

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    Quote Originally Posted by Chuck(G) View Post
    Do any newer Chinese programmers support the old 3-rail (e.g. 270 EPROMs? I've never seen one that does.
    Not even my upper mid-end programmer from the ealy 90's support those. The need for a negative routable supply would have made the design a lot more complex as well. Maybe some high-end programmers have negative supply and routing neccisary, allthough it may be a stretch to expect all that extra hardware neccisary just to support an obsolete part nobody have been using professionally since the early 80's.

    I went for an older programmer mainly because the most recent popular Chinese USB ones can't handle programming beyond 18V. I got a few EPROMs that needs higher Vpp than that, and it's nice to have a programmer that can go closer to 30V then.
    Last edited by per; May 7th, 2020 at 11:00 AM.
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  3. #43
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    Quote Originally Posted by Chuck(G) View Post
    Do any newer Chinese programmers support the old 3-rail (e.g. 270 EPROMs? I've never seen one that does.
    No, I haven't seen an inexpensive one sold new in 15 years that could, which is why I had to build one. I know it does 2708's, and it probably does 2704's.

  4. #44
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    FWIW, I did find this Arduino-based project that does 2704, 2708 as well as MCM6876x (8K) EPROMs. Looks to be pretty simple.

  5. #45

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    So looking around it turns out that Logical Devices, Inc. is still around and that they are a division of Needhams Electronics.

    I was able to get a "manual" for the eraser and it basically reiterates thing discussed in the thread already:

    1. That florescent lighting will take ~3 years to wipe EPROMs and direct sunlight ~about a week.
    2. 15 minutes should be typical erasure times but two tx maybe needed depending on age of bulb, EPROM, dirty window, etc.
    3. A typical EPROM can last about a week of exposure in the eraser (1 week at 12000 uW/cm2)

    Edit: I should add that for my particular model the manual recommends 20-30 minutes from the get go. Not sure why because all the models in the range seem to use the same UVC bulb.
    Last edited by Shadow Lord; May 8th, 2020 at 03:40 PM.
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