Name that Ware, December 2019

The Ware for December 2019 is shown below.

This one should be cakewalk, especially because I left some significant hints visible.

I love the construction of the ceramic decoupling capacitors — they look like modern surface-mount capacitors that have been put into retro glass tubes to give them through-hole legs!

12 Responses to “Name that Ware, December 2019”

  1. dwu says:

    Leaving the DEC logo in the upper right gave it away :)

    It’s a DEC DZV11-A module, number M7957: http://bitsavers.trailing-edge.com/pdf/dec/qbus/EK-DZV11-UG-002_DZV11_Asynchronous_Multiplexer_Users_Guide_Aug78.pdf

    Looks like some kind of 4-channel RS232 interface.

  2. Thomas says:

    My guess was a PDP-8 or 11 in one of its incarnations, but others meat me to it.
    DEC/PDP because of the gold lidded chips with DEC on them.

  3. Keith Ward says:

    Definitely some sort of 232 serial interface. But I’ll go out on a limb and say floppy drive controller for the fun of it.

  4. ChuckB says:

    Was at DEC from 87 to 97, I think every component had a DEC internal part number in the format 2-5-2 (number of digits). I think 21 was the prefix for MOS and 19 for bipolar. If chips were custom for DEC, they had the DEC pn. I wonder what those Intersil parts are, I’d guess UARTs.

  5. jb says:

    This board is definitely a DEC DZV11 async multiplexer. It was manufactured at DEC’s Albuquerque plant (the AB code on the QC stamps and initial 2 characters of the serial number label show this).

    The decoupling capacitors are glass cased ceramic devices and as I recall were mostly supplied by Unitrode. They had the advantage of being smaller than any alternatives – being able to fit holes on a 0.25 inch pitch – and were also insertable with an automated axial lead inserter.

  6. Jeff Bell says:

    You will notice that they use the DEC alphabet.

    It omits I and O to avoid confusion with one and zero.

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