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Thread: Netronics Explorer/85

  1. #51

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    I finally got the EPROM programmer design updated to support 8755A chips. There is a new thread on it in the Tech Support goup here: http://www.vcfed.org/forum/showthrea...ROM-programmer

  2. #52

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    It would seem that the programming is the same except the adapter card is different.
    See: http://www.bitsavers.org/pdf/intel/u...anual_1977.pdf
    in section 9.
    The only difference I see is that there is a Schottky diode, 1N5821, between Vcc and Vdd for the 8755A part.
    It would seem that a simple switch on the diode would handle the difference. It would seem that Vdd is to go to 0 volts between programming pulses for the 8755 while it is to go to 5V for the 8755A.
    Dwight
    Last edited by Dwight Elvey; May 17th, 2018 at 10:41 PM.

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