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  1. Tektronix 4051 Memory Dump Program - Source Code Listing

    I had a request for the Motorola 6800 source code for my 1979 assembly language program for Tektronix 4051 Memory Dump.

    See my post #66 earlier in this thread for a screenshot running this program...
  2. Tektronix 4052 graphics computer (early 1980's) for sale on EBAY for $1250

    I am not associated with the seller - just posting an auction I found on EBAY.

    http://www.vcfed.org/forum/attachment.php?attachmentid=64181&d=1603107911
    ...
  3. Jos, Thanks - that matches my test results. ...

    Jos,

    Thanks - that matches my test results.

    You may want to put a note about that address swap of the RS-232 Printer Interface in your MFM document.

    Monty
  4. Jos, Hope you can easily fix your 4052. I...

    Jos,

    Hope you can easily fix your 4052.

    I posted updates to my github repo:
    Updated the 4052 File Manager-01 folder with the corrected U13 EPROM image
    Updated the Jos MFM Test Files folder...
  5. I forgot to describe the different CRC columns in...

    I forgot to describe the different CRC columns in the program.

    The Tektronix CRC list for 4052/4054 is a little mysterious, and took me a while to decode how they did it.

    Some of the CRC for...
  6. Thanks Roland! Have you been able to try the...

    Thanks Roland!

    Have you been able to try the RS-232 yet?

    Monty
  7. MFM is WORKING!!!

    Jos,

    I believe your MFM is NOW WORKING!!!

    I figured out my 4907 issue - the 3rd ROM I uploaded had a stuck data bit - so that image was corrupted.
    I re-captured the 3rd ROM in my cartridge...
  8. Another update from testing. I moved the...

    Another update from testing.

    I moved the 4050E01 to my 4052 computer and inserted the original ROM Packs in the same slots as my MFM17 test image.

    I also modified my CRC program to CRC-16 the...
  9. Jos, Looking again at the Opt 1 Serial...

    Jos,

    Looking again at the Opt 1 Serial Interface in the 4052/4054 schematics, I think the RS-232 Printer Interface won't work with RTS/CTS hardware handshake - the 68B50 in Option1 doesn't connect...
  10. Jos and Roland, I figured out my issue with...

    Jos and Roland,

    I figured out my issue with getting the MFM RS-232 printer interface to work again - my rewiring of my DB-9 connector had only changed one of the two handshake signals, now my MFM...
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    Roland, I think that is typical as these tapes...

    Roland,

    I think that is typical as these tapes are 40 years old.

    I had success with a plastiband on NOS DC100 tapes - but I put the tapes in a dehydrator for 2 days first. Otherwise the oxide...
  12. I just posted a youtube video of the gplanet...

    I just posted a youtube video of the gplanet graphic.

    It only takes 1 minute 42 seconds to draw the graphic at 9600 baud.

    https://www.youtube.com/watch?v=vpE-Zx7yNpo
  13. Tektronix 4051 4052 and 4054 computers emulating Tektronix 4010 and 4014 terminals

    Today, I experimented with using my Tektronix 4052 and 4054A graphics computers as emulators of the Tektronix 4010 and 4014 graphics terminals.

    This is very easy to accomplish - since the...
  14. TransEra 764-RAM Tektronix 4052/4054 ROM Pack 12L6 PAL

    Jos,

    Here is my capture of the TransEra Auxiliary Memory ROM Pack 12L6 PAL:



    TransEra 764-RAM 4052/4054 Auxiliary Memory ROM PACK

    National DMPAL12L6NC read with DataIO 29B with 303A-011A...
  15. I'll see if I can read the PAL on the TransEra...

    I'll see if I can read the PAL on the TransEra Auxiliary Memory ROM Pack.

    Monty
  16. Now the good news, I have been running the MFM in...

    Now the good news, I have been running the MFM in the right slot with MFM15 image and a 4907 File Manager ROM Pack installed in the left slot.

    I have successfully mounted a 4907 8 inch floppy...
  17. I can't duplicate my previous result on the...

    I can't duplicate my previous result on the RS-232 Printer Interface on the MFM :(

    Here is a photo from last week (when I had it working) of successfully printing with Jos' prototype MFM (hardware...
  18. Jos, I agree, a fully tested module would be...

    Jos,

    I agree, a fully tested module would be better.

    I don't know if any more ROM images are needed - the six I put in my test image will run all the software programs I have posted on github....
  19. Jos, I have some good news - I think I found a...

    Jos,

    I have some good news - I think I found a combination of components that work in both your first MFM board and my assembly with different RTC, and both work in my 4052 and 4054A!

    The...
  20. I figured out how to get Jos' Diagnostic ROM Pack...

    I figured out how to get Jos' Diagnostic ROM Pack CRC program to check ROM Packs in the 4050E01 ROM Expander, although it isn't working yet with the MFM ROM Pack.

    The decoder ring was in three...
  21. Jos, My 4054 is the only one that is A-series,...

    Jos,

    My 4054 is the only one that is A-series, my 4052 is non-A, which is why I suspect my faster GAL timing may be the issue: -15 vs -25 on the GAL you sent me that I cannot reprogram on my Data...
  22. Roland, I just noticed you have a 4-slot...

    Roland,

    I just noticed you have a 4-slot backplane in your 4052. You may have the only one of those!

    What were the option codes listed on the labels on the back of your 4052?

    Tektronix made...
  23. Roland, I believe I'm dealing with a GAL...

    Roland,

    I believe I'm dealing with a GAL timing problem on my board.

    I've hooked my HP16500B Logic Analyzer to my MFM board - and it looks like the clock to the 74LS173 is less than 10nsec from...
  24. In debugging Jos Dreesen's 4052 Multi-Function...

    In debugging Jos Dreesen's 4052 Multi-Function ROM Pack, I encountered a System Error message this morning, which results in clearing the program from memory.

    I remembered a Tekniques article...
  25. I'm also looking into replacing the tape with a...

    I'm also looking into replacing the tape with a custom ROM Drawer using the 4041R04 UTILITY PROM file system.

    This is described on page 6-2 of the 4041 Utility ROM manual on bitsavers.org.
    ...
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