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Type: Posts; User: nikola-wan

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  1. Replies
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    EBAY 4907 and 4907 Option 30 two more 8 inch drives - both WORK!!

    Encourage by my success in getting two Tektronix 4907 drive systems working - I just received two more from EBAY, one more 4907 controller with one drive and one dual 8 inch floppy slave unit for the...
  2. Chuck, Do you have an 8 inch alignment disk? ...

    Chuck,

    Do you have an 8 inch alignment disk?

    Monty
  3. Chuck, When I got the two Tektronix floppy...

    Chuck,

    When I got the two Tektronix floppy drive systems and was checking the drive termination jumpers - I noticed the index hole detector seal on the mounting screw was broken and that detector...
  4. WTB: 8 inch single-sided hard sector floppy alignment disk (Shugart or Dysan)

    I have two Tektronix 4907 8 inch floppy disk systems that will not exchange media - so I would like to buy a SS alignment disk for a hard-sectored 8 inch floppy disk drive (Shugart drive).

    Anyone...
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    Dwight is correct - there are only 32 hard sector...

    Dwight is correct - there are only 32 hard sector holes located around the center of the disk.

    Here is a figure I found in the 3M Diskette Reference Manual dated May 1983 that I found on the web -...
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    Sorry to revive such an old thread but I have two...

    Sorry to revive such an old thread but I have two Tektronix 4907 8 inch floppy disk systems that will not exchange media - so I think I need a SS alignment disk for hard-sectored (34) 8 inch...
  7. This is a Tektronix 4052 computer

    Verault,

    This is a 1980 vintage Tektronix 4052 graphics computer with a 25 MHz AMD 2901 bit-slice processor emulating an 8-bit Motorola 6800 CPU at almost 10x more performance and doubling the...
  8. Tektronix ADVENTURE now works on all 4052 and 4054 computers with 64KB RAM and 4907

    I have been working on getting my Tektronix 4052 and second 4907 Floppy Drive System working to put on the consignment table at VCF Pacific Northwest in Seattle March 21 and 22.

    I copied several...
  9. More photos of the RTC board: top view before...

    More photos of the RTC board:

    top view before replacing the batteries:

    http://www.vcfed.org/forum/attachment.php?attachmentid=59399&d=1582770935

    side view:
    ...
  10. Replies
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    Chuck, That's a good question, I'll check the...

    Chuck,

    That's a good question, I'll check the pads on both drives.

    What is a good replacement material if the pad is missing?

    Monty
  11. Replies
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    I've been examining my two Shugart 850 drives in...

    I've been examining my two Shugart 850 drives in my Tektronix 4907 floppy disk systems.

    At this time - there is a compatibility problem, and NOS Athana hard sector disks that I formatted and read...
  12. Vintage Tektronix 4662 plotter for sale

    Found this post on Vintage/Retro Computer Swap Meet facebook site:

    Tektronix 4662 plotter - $50

    59200
    ...
  13. Replies
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    Dave, Great progress! If you need any more...

    Dave,

    Great progress!

    If you need any more traces - just ask.

    Now I'll go back to debugging my second 4907 floppy disk system - hopefully I can get it fixed in time to take it to Seattle for...
  14. Replies
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    Dave, After that loop we get to the 300's in...

    Dave,

    After that loop we get to the 300's in microcode addresses!



    MACHINE 1 - State Listing

    ...
  15. Replies
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    23,185

    Dave, Here is the trace starting at 0BD, but...

    Dave,

    Here is the trace starting at 0BD, but it quickly becomes a new loop.

    I think I'll change the trigger to 0C9 to see what happens next



    MACHINE 1 - State Listing
  16. Replies
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    4052 boot microcode trace

    Dave,

    Here is a microcode boot capture file from my 4052 /w v5.1 firmware, captured from some of the ALU header signals with my HP16500B logic analyzer.

    All the signals are being clocked by...
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    Dave, Outstanding progress! Monty

    Dave,

    Outstanding progress!

    Monty
  18. Replies
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    Dave, Great progress! My HP16500B logic...

    Dave,

    Great progress!

    My HP16500B logic analyzer didn't work this morning when I powered it on :(

    Found the power supply was broken - replaced from a 16500 parts unit. Then the CF card that...
  19. Replies
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    23,185

    Dave, I'll get my logic analyzer hooked up to...

    Dave,

    I'll get my logic analyzer hooked up to my 4052 tomorrow.

    I assume you have looked at the 4052/4052A assembly code instructions with condition codes on pg 20-83 in the...
  20. Tektronix 4054A - R2D2 vector graphics scaling demo and video

    I just finished a new Tektronix BASIC program to demo at my exhibitor table at VCF Pacific Northwest Festival on March 21 and 22 in Seattle WA at the Living Computers Museum.

    Come by my table to...
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    Thanks, Torfinn! I have really enjoyed...

    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...
  22. Replies
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    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...
  23. Dave, I stand ready to help! I wonder if...

    Dave,

    I stand ready to help!

    I wonder if capturing more 4052 microcode traces would be of help? I have been able to fix my HP 16500B Logic Analyzer, which has more probes than the analyzer I...
  24. ADVENTURE64 for Tektronix 4051/4052/4054 Computers

    I finally got a new Adventure game running on my Tektronix 4054A computer with Tektronix 4907 Floppy Drive System!

    http://www.vcfed.org/forum/attachment.php?attachmentid=58807&d=1580133422

    I...
  25. I replaced the corroded NiCd batteries in my TransEra RTC module

    I have successfully replaced the three corroded NiCad batteries in my TransEra 741-RTC ROM pack!

    The original batteries were beyond repair and my earlier photos in this post showed significant...
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