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Thread: ASR43 TAU Help

  1. #1
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    Default ASR43 TAU Help

    I have a model 43 teletype which someone previously pulled the Terminal Auxiliary Unit (the thing that converts the line in to CMOS digital levels) and kludged in a current loop adapter. I want to add support for both current loop and serial again but while I can find the diagrams for the board they list the components with Teletype part numbers. Does anyone have a cross reference or will I need to do a bit of reverse engineering of their numbering?




    474032 - 74LS32 - Quad 2-input OR gate?
    474008 - 74LS08 - Quad 2-input AND gate?
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  2. #2
    Join Date
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    Default

    Okay I think I figured that parts list out by guessing what it might be.

    474032 - 74LS32
    474008 - 74LS08
    404049 - CD4049
    335529 - MC1489
    335528 - MC1488
    335522 - 4N33
    326800 - 4N33

    Technically the optoisolators are something entirely different but you can sub in 4N33's and you should be fine. The only other one I was a bit hung up on was the MC1489. It's an EIA-232 receiver, the pinout of the chip matches the schematic but it has "Response Control". Presumably it's for noise filtering or setting the threshold so I'm not sure if those pins were omitted from the schematic or this isn't the correct part.
    [Need something to waste time on? Click here to visit my YouTube channel CelGenStudios]
    --------------------------------------------------------------------------------------------
    [No time for videos? Click here to visit my Twitter feed @CelGenStudios]

    = Excellent space heater

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