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Thread: Tektronix 4052 Troubleshooting

  1. #41

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    Dave,

    I got my Tektronix 4054 working, then put in the upgrade kit (new ALU ROMs, new MAS board, new I/O board) to make it a 4054A - see my other thread:

    Tektronix 4054 Troubleshooting

    Monty

  2. #42

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    Quote Originally Posted by nikola-wan View Post
    Dave,

    I got my Tektronix 4054 working, then put in the upgrade kit (new ALU ROMs, new MAS board, new I/O board) to make it a 4054A
    Way to go. Monty!!!
    "END OF LINE" [MCP, 1982]
    "An admin that isn't a bit hackerish is just the guy mopping up the keyboard" [Phrack V0b I3f P12]
    "Any appearance of danger is simply a device to enhance your experience" [Futureworld, 1976]

  3. #43

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    Quote Originally Posted by daver2 View Post
    Cheers Monty. All will come to those who wait!

    I have seen a sketch of the 4052A MAS in one of the Tek documents - and your schematic confirmed what I thought regarding the removal of the FPLAs and patch ROMs - although it did throw up the interesting item that the 'extra' EPROM lives from 0000 - 3FFF (I wondered how the extra EPROM appeared in the memory map. Now I know)!

    Looks like J419 just completely disables the on-board ROM to me (so not as interesting as I had first guessed).

    Dave
    Dave,

    I realize that the schematics from Roland for the MAS are all the 4052A diagrams - here is my link to scans I just made of the 4052 MAS diagrams 1 through 5:

    Tektronix 4052 MAS schematics 4-1 to 4-5

    Monty

  4. #44

    Default My Tektronix 4052 is now working again!

    I fixed my Tektronix 4052 computer display issues today!

    I replaced the U184 op amp 5558 with an MC1458.

    Here is a photo of the section of the display board with the replaced op amp highlighted in yellow.



    First program I loaded to do more testing was my Battlestar Galactica "Vipers on Patrol":



    Then I copied my port of Colossal16 Adventure in BASIC to tape to try:






    ************************************************** ******************************************

    I plan to attend the VCF PNW in Seattle on March 21 and 22, and will be bringing my 4054A and repaired 4052.

    I plan to put the 4052 for sale on the consignment table - unless it is sold prior to the VCF Festival in Seattle.

    ************************************************** ******************************************

  5. #45
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    Nice! It is a good feeling when you manage to fix something that broke.
    Torfinn

  6. #46

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    Quote Originally Posted by tingo View Post
    Nice! It is a good feeling when you manage to fix something that broke.
    Thanks, Torfinn!

    I have really enjoyed reliving my fond experiences with the Tektronix 4051 computer from the 1970's - and want at least one other person to be able to do the same with my 4052 computer.

    The 4052 and 4054 computers have the huge 7-10x performance advantage over the 800MHz 6800 based 4051, due to the custom 25MHz AMD2901 bit-slice 16-bit architecture, which not only emulated the 6800 8-bit instructions, but added sixteen 16-bit CPU registers, 64-bit floating point instructions, and 16-bit address and data in 1979, while still providing the state of the art 1024x780 vector graphics (4096x3072 for the 4054/4054A)!

    Monty

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