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Thread: Arduino keyboard emulator host wiring.

  1. #11

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    Oh awesome, it auto-resized it for me. No matter, http://binarydinosaurs.co.uk/tandataPASchematics-01.jpg

    That one is zoomable.
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  2. #12
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    Woof--that is one involved keyboard scanning circuit. Do we have a datasheet on Z2? (5089--it seems).

  3. #13

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    Not good. It is a touch tone signal. I thought it was just a regular keyboard. I assume from the pinouts that the two chips connected to the keyboard are 4051s? Z2 is a little more complicated than a regular cross matrix. What is Z2??
    Dwight

  4. #14

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    Hi Chuck
    I was typing while you were posting. It looks like the pinout matches the 5089. Jameco has a pdf for it. I'm looking is it right now. There is a signal on Z5 pin 1 that I don't yet understand. Maybe the pdf will explain.
    Dwight

  5. #15

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    TCM5089ANS Tone encoder, powered by telephones!

    https://www.datasheetarchive.com/pdf...M&term=TCM5089

    This PA is an autodialling hands free telephone too so that kinda makes sense.
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  6. #16

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    I should include the link to my writeup on the whole machine - http://binarydinosaurs.co.uk/Museum/Tandata, some interesting reading in there!
    www.binarydinosaurs.co.uk - UK home computer history
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  7. #17
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    It seems that the 5089 isn't really part of the keyboard decoding per se, as the only output seems to be the DTMF tone for dialing.

    There's a connector to the left of Z6 that I'm having trouble figuring out.

  8. #18

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    I think we need to see the keyboard. It my look like a regular matrix but actually the keys are normally like a double pole switch with a common ground. In other words there are two separate contacts being made, not just two lines connected together.
    Dwight

  9. #19

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    Pics here: http://www.binarydinosaurs.co.uk/Museum/Tandata/pa.php

    It's a rubber dome keyboard, the keys really are two lines connected together as you can see from my little cursor key keyboard I made.

    Chuck, the connector to the left of Z6 looks to be the keyboard connector SK6. I've done a pic showing both sides of the board, two ticks while I upload.
    www.binarydinosaurs.co.uk - UK home computer history
    Where RIFA capacitors come to die
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  10. #20

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    www.binarydinosaurs.co.uk - UK home computer history
    Where RIFA capacitors come to die
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