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Thread: Tektronix 4010

  1. #1

    Cool Tektronix 4010

    Last week I've picked up some nice old pieces of history. One of them was the Tektronix 4010.

    Tektronix 4010 01.jpg

    Because it has collected dirt for 46 years, I first cleaned thoroughly.

    Tektronix 4010 02.jpg Tektronix 4010 03.jpg Tektronix 4010 04.jpg Tektronix 4010 05.jpg Tektronix 4010 06.jpg

    And I don't want to sit on my knees when servicing this kind of electronics.
    But now I bumped my head several times against the bottom of the terminal.

    Tektronix 4010 07.jpg

    Slowly powered it up. A bridge rectifier already got quite warm with only 40V mains voltage (set at 220V mains).
    And there was one fuse of 8A where a 2A fuse should be. Well, it really does not trip when it is necessary.
    The cause of the hot bridge rectifier was in a shorted tantalum capacitor on the -15V supply line on one of the boards.

    After some further measurements, the + 20V showed enormous ripple voltage. This was caused by a
    dead filter capacitor. And what a worthless construction to get that cap out! So I thought
    let me put that spare power in there which I got with it. It might save some time is that one works.
    Unfortunately the 5V TTL power supply was faulty on that one. So I had two broken power supplies.

    So I repaired the original power supply. Slowly turned up the mains voltage again
    and POOF, there went that -20V fuse again! Now on another board a tantalum on
    the -15V shorted. It remains old stuff of course

    Tektronix 4010 10.jpg Tektronix 4010 11.jpg Tektronix 4010 08.jpg Tektronix 4010 09.jpg

    And I put everything back together again...

    Tektronix 4010 12.jpg Tektronix 4010 13.jpg

    So meanwhile it is running DIR on PDP8 / F:



    Now it would be nice to throw some graphics data to it.

    Regards, Roland
    WTB: Case for Altair 8800 ...... Rolands Github projects

  2. #2
    Join Date
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    Roland,

    Nice find !

    on ftp://ftp.dreesen.ch/TEk4014 you wil find plt.tar, which contains a lot of graphic demos for the 4014. Just send them down the serial port .
    I believe they would also run on the 4010

    Jos

  3. #3

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    Hi Jos,

    Thanks, I will check it out!

    The data cable is a bit messy. Only gnd, rx and tx are connected trough an old mains cable.
    So I want to make it original again, but I can't find the cable pinout in the manual.
    And I can't find this data communication card in the manual... It seems to be pretty old.
    All chips date from 1971...

    Tektronix 4010 14.jpg

    Regards, Roland
    WTB: Case for Altair 8800 ...... Rolands Github projects

  4. #4

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    Roland,

    That was quick repair work on your 4010!

    Now its time to start on your 4052

    Please post a photo of the rear of your 4052 - I'm particularly interested seeing that 4-slot backpack, and any label on the back indicating any other factory options.

    Congratulations on your 4010 repair!

    Monty

  5. #5

    Default

    Hi Monty,

    Quote Originally Posted by nikola-wan View Post
    Now its time to start on your 4052 Please post a photo of the rear of your 4052 -
    I'm particularly interested seeing that 4-slot backpack, and any label on the back indicating any other factory options.
    I will make a new topic for the 4052 and post some pictures from it.
    I've made a lot of pictures of my 4010 and sent them to Kurt for the Tek WiKi.
    Maybe he likes to place them there. My 605 and 611 are displayed there too...

    Quote Originally Posted by nikola-wan View Post
    Congratulations on your 4010 repair!
    Thanks! In the meanwhile I found the part number for the Tektronix 4010 data cable.
    Searching on that number lead to another document which describes
    the serial data board and cable. So that is fixed as well...

    Too bad that there are so few serial port settings on the board.

    Regards, Roland
    WTB: Case for Altair 8800 ...... Rolands Github projects

  6. #6

    Default

    The communications is an option so its in a separate manual
    http://www.bitsavers.org/pdf/tektron...comm_Aug81.pdf
    Mine had the same card and I have the official cable if the manual isn't clear.

    My 4014 had the same shorted tantalum capacitors.

    From when I was playing with them I think some of the files in the tar file are 4014 specific but a number should work fine on the 4010.

  7. #7

    Default

    Quote Originally Posted by djg View Post
    The communications is an option so its in a separate manual
    http://www.bitsavers.org/pdf/tektron...comm_Aug81.pdf
    Mine had the same card and I have the official cable if the manual isn't clear.

    My 4014 had the same shorted tantalum capacitors.

    From when I was playing with them I think some of the files in the tar file are 4014 specific but a number should work fine on the 4010.
    That was the manual I found later indeed. The cable is now back to the original wiring scheme.
    I will check out the plot files!
    WTB: Case for Altair 8800 ...... Rolands Github projects

  8. #8

    Default

    I have been playing a bit with my 4010 and there are a few things which I noticed...

    When connected to a PC the 9600 baud seems to be too fast for the terminal to
    accomplish all tasks in time before the next command arrives. Look at the differences
    between the characters F, I and R in these pictures. The first is 4800 and second 9600 baud

    01 wizidd PC 4800.jpg 02 wizidd PC 9600.jpg

    I thought that my PC wasn't handling the DTR right, so I connected it to a PDP11/10.
    Autsj! Many times, when the PDP11 is buffering from disk, the 4010 throws a glitch onto the screen...
    I made the first picture on 1200 baud and the second at 9600 baud. The F, I and R are still ugly at 9600.
    Bot this is nothing compared to the other mess...

    04 PDP11 1200.jpg 03 PDP11 9600.jpg

    Here another picture. First 9600 baud on a PC and the second on 9600 baud PDP11.
    05 Wizard pc 9600.jpg 06 Wizard ppd11 9600.jpg

    I thought this has something to do with RTS and DTR, but these are just looped back in the terminal.
    The strange thing is that the serial board in this 4010 is very old compared to the rest. Maybe not original?

    Are there some official Tektronix test programs which I can use on the 4010?
    Maybe it has just something to do with a line draw function which does not work well?

    Regards, Roland
    WTB: Case for Altair 8800 ...... Rolands Github projects

  9. #9

    Default

    Roland,

    I suspect the serial issues are due to lack of hardware flow control.

    Here is an image of a couple of pages from the bitsavers 4010 Comm manual:



    Looks like the 4010 has a jumper for communicating with a computer instead of a modem in Table 1-2.

    Also looks like hardware flow control is on 4010 RS-232 pins RTS and DTR, so the jumper on these two pins in the cable may be your issue.

    Only 4010 'plot' files that I have found are posted here:
    https://github.com/rricharz/Tek4010

    Monty
    Last edited by nikola-wan; September 10th, 2020 at 05:18 AM.

  10. #10

    Default

    Hi Monty, thanks for your feedback

    Quote Originally Posted by nikola-wan View Post
    I suspect the serial issues are due to lack of hardware flow control. Also looks like hardware flow control is on 4010 RS-232 pins RTS and DTR, so the jumper on these two pins in the cable may be your issue.
    I suspected that too... But flow control does not exist on the board.
    The RTS and DTR, are just looped back in the terminal on the RS232 board.

    loop back flow control.jpg

    Quote Originally Posted by nikola-wan View Post
    Only 4010 'plot' files that I have found are posted here: https://github.com/rricharz/Tek4010
    There seem to be a lot pictures which Jos has collected also.
    But it would help if there were some tests for the Tektronix.

    Another strange behaviour is with text... This image is made at 4800 baud from my PC.
    No changed made in the setup. Just sending the same file again and again. Just compare the
    text on top of the screen...

    07 tek editor.jpg 08 tek edito.jpg 09 tek editor.jpg 10 tek editor.jpg

    The terminal sometimes adds spaces between characters. In text mode it has the same problems btw...
    Sometimes with typing a text like "Tektronix" appears like "T E K T R O N I X". The baud rate or other serial settings
    don't seem to have any influence on this behaviour.

    So there still seem to be something wrong in the terminal... I'm not sure if both problems have the same cause...

    Regards, Roland
    Last edited by Roland Huisman; September 10th, 2020 at 08:28 AM.
    WTB: Case for Altair 8800 ...... Rolands Github projects

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