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Thread: Tektronix 4052/4054 System Test Fixture

  1. #1

    Default Tektronix 4052/4054 System Test Fixture

    I want to post information on the Tektronix 4052/4054 System Test Fixture I purchased many years ago.

    I have not been able to find any more information on this test fixture. A similar 4051 System Test Fixture is described in the 4051 service manual.

    This is a photo of the front of this System Test Fixture, Tektronix part number 067-0942-00:



    Here is a photo of the top with the ribbon cables. Note no labels on the LEDs and slide switches.



    Here is a closeup of the keypad, LEDs and slide switches:



    The back view shows only the ribbon cables - no power cord, so the System Test Fixture must be powered from the ribbon cables



    Lets look inside - cool, a small board with three EPROMs:



    I wonder if the EPROMs are code for the 4052/4054?

    What is behind the keypad and LEDs?



    Ok - this looks like more than required to just scan the keys - lets see the board



    Here is a closeup - wow a Motorola 6800 CPU. The EPROMs on the small board must be 6800 firmware.



    I took more photos around the LEDs and switches - I can now understand their functions:



    The corner of the board with the Motorola 6800 has a header with no cable - labeled +5,12,-12 and GND



    I wonder if I should just try powering up that header

    Top row of LEDs:

    P0 P1 P3 P4 (parity bits?) LA0 through LA23

    Second row of LEDs:

    LD0 through LD31

    LEDs above the four slide switches:

    RUN Fault

    Aerr Perr

    Top two slide switches:

    Parity Error "PE" Address Error "AE"

    Two LEDs between the four slide switches

    ACOMP PCOMP

    Bottom two slide switches

    Address Compare "AC" Program Counter Compare "PC"
    Last edited by nikola-wan; July 15th, 2019 at 07:04 PM. Reason: added info on LED labels

  2. #2
    Join Date
    Mar 2006
    Location
    Salt Lake City, UT, USA
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    Default

    This looks pretty neat. I would definitely dump the firmware!

    Quote Originally Posted by nikola-wan View Post
    I wonder if I should just try powering up that header
    My guess is that the header can be used to power up the board when disconnected from the system under test.

    Top row of LEDs:

    P0 P1 P3 P4 (parity bits?) LA0 through LA23
    My guess would be that P0-4 are just output bits from a port on the 6800 or perhaps represent some parallel data.
    I'm not super familiar with the internals of the 405x to say if the P/LA lines mean something significant in terms of
    the internal architecture of the system. Maybe LA lines are address bus lines?

    Second row of LEDs:

    LD0 through LD31
    LD are data bus lines?

    LEDs above the four slide switches:

    RUN Fault

    Aerr Perr
    Address error? Parity error? Seems to be confirmed by the labels on the other slide switches.

  3. #3

    Default

    Quote Originally Posted by legalize View Post
    This looks pretty neat. I would definitely dump the firmware!
    I dumped all three of the 2716 EPROMs and converted to binary ROM files and posted in a new folder on my github archive site for Tektronix 4050 programs:

    https://github.com/mmcgraw74/Tektronix-4051-4052-4054-Program-Files/4052-4054_SystemTest

    I also uploaded my attempt at disassembling the U171 EPROM using f9dasm.ext to that github folder.
    I set the org to F800, as this 2KB EPROM appears to have this as the FFFE-FFFF reset vector.

    I checked around the 6800 and found a pair of Signetics 2606N-1 256x4 bit static RAMs.

    The disassembly appears to use locations at zero - so that may be the RAM address location.

  4. #4

    Default

    Hi,
    Looks like a small part of a larger automatic test equipment (ATE) set-up used in manufacturing. Have you tried asking in these forums?

    https://www.eevblog.com/forum/testgear/

    https://groups.io/g/TekScopes/topics

    Both free to join, or I can post on your behalf if you want.

    Regards,
    John

  5. #5

    Default

    Quote Originally Posted by 1980s_john View Post
    Hi,
    Looks like a small part of a larger automatic test equipment (ATE) set-up used in manufacturing. Have you tried asking in these forums?

    https://www.eevblog.com/forum/testgear/

    https://groups.io/g/TekScopes/topics

    Both free to join, or I can post on your behalf if you want.

    Regards,
    John
    John, thanks for the tip.
    I think I will try on eevblog - I have posted there before.

    Monty

  6. #6

    Default

    Thanks, I see your post got some replies - good luck figuring it out!

    https://www.eevblog.com/forum/vintag...re/msg2556183/

    Regards,
    John

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