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Type: Posts; User: nikola-wan

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  1. Vintage Tektronix 4662 plotter for sale

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

    Tektronix 4662 plotter - $50

    59200
    ...
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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...
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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

    ...
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    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
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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
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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...
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    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...
  9. 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...
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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...
  12. 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...
  13. 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...
  14. 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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    Here is my updated table including a run made...

    Here is my updated table including a run made yesterday on a Tektronix 4051 with an 800KHz Motorola 6800 CPU, 8.2X slower than my Tektronix 4054A bit-slice CPU architecture with microcode floating...
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    Interface age bm9 basic benchmark from all sources

    "BASIC, FORTRAN, S-ALGOL, and PASCAL Benchmarks on microcomputers including the effects of floating point processor support" was published by Marcus Wigan in August of 1982 as mentioned earlier in...
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    Tektronix 4051 computer was my first 'personal'...

    Tektronix 4051 computer was my first 'personal' computer in my first job after college in the mid 1970's.

    I loved the instant access of Tektronix 4050 BASIC a couple of seconds after powering on...
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    I forgot to mention, Tektronix 4050 BASIC had no...

    I forgot to mention, Tektronix 4050 BASIC had no integer variables, all numeric variables were 14 digit floating point +/-8.998E+/-307 (8 bytes plus variable name overhead).

    The 4054A/4054A ALU...
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    bear, Thanks for your benchmark. I ported...

    bear,

    Thanks for your benchmark.

    I ported the Commodore 64 program to my early 1980's Tektronix 4054A computer and got 21.27 seconds for n=100 last night:



    Benchmark PRIMES
    Start:...
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    Jon, I really don't have a use for a standard...

    Jon,

    I really don't have a use for a standard video terminal like the 4025.

    I have been toying with the idea of a FPGA emulator of the 4051, and a storage tube terminal might be a great...
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    I just purchased a working c64, 1402 monitor, and...

    I just purchased a working c64, 1402 monitor, and 1541 floppy drive in November.

    Here is what I purchased to hook the c64 video cable to my Sony TV HDMI port for a total cost of $24

    S-Video...
  22. Me too, Brad. Right now my 19" 4054 is working...

    Me too, Brad.

    Right now my 19" 4054 is working great - and I'm debugging my port of ADVENTURE64 by Jim Butterfield for the Commodore PET with floppy disk to the Tektronix 4050 computers with the...
  23. NCR-PC4i-VINTAGE-COMPUTER-1985-DECISION-MATE-PC-w-MANUALS-5-25-FLOPPY-DISKS - EBAY

    58247

    Almost working (keyboard error), NCR4i computer with integrated monitor. and software.
    ...
  24. RARE-Vintage-1985-NCR-Modular-Computer-Terminal-System-Convergent-Ngen EBAY Auction

    58246

    https://www.ebay.com/itm/RARE-Vintage-1985-NCR-Modular-Computer-Terminal-System-Convergent-Ngen/202679566783


    $599

    Has processor, floppy disk and hard drive modules - but no power...
  25. Examples of what this computer can do include...

    Examples of what this computer can do include hires "greenscale" bit-mapped graphics:

    http://www.vcfed.org/forum/attachment.php?attachmentid=58196&d=1577282619

    and vector text and drawings -...
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