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  1. Interdata Model 1 Information....

    I am looking for the service manual for any of the early Interdata systems. I have an Interdata Model 1 that I would like to restore. It uses 10-inch boards that were common in other early...
  2. Here is the pinout of my adaptor. The "Plug" is...

    Here is the pinout of my adaptor. The "Plug" is the TMS2716 pinout plug to go into the reader, the "socket" is the MCM6832. Note that I labeled the address bus A1 to A11 and the data bus is D1 to...
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    I'm not sure what happened to the photo in the...

    I'm not sure what happened to the photo in the previous post, but here it is again. 5635256353 The circuit is basically U481a of the tape board schematic (early rev. board) that connects to pin 34 &...
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    No ROM patch needed. I was able to kludge...

    No ROM patch needed. I was able to kludge together a tape drive emulator. 56351 The chip provides a 40 nS delay to a signal that loops in & out of the tape board. It seems to be related to the...
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    Yes please! What do you want for it? I was...

    Yes please! What do you want for it? I was working out a way to emulate the tape board to fool the 4052 into thinking it was connected. I believe it would mostly need a pull-up on several inputs...
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    Progress!! I had found that several of my...

    Progress!! I had found that several of my firmware ROM's were bad so I set out to replace them with the latest image available for the 4052 (version 5.1). The only known EPROM with the same...
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    I finally got my subscription to the DataIOEPROM...

    I finally got my subscription to the DataIOEPROM group approved also. I have the original UNIPAK (not the 2 or 2B) and the device list indicated the WSI 57C49... needs V11 on the original UNIPAK. ...
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    I did see the that a tape drive is required for...

    I did see the that a tape drive is required for the 4052 to boot. The same is true for the 4051. I borrowed the drive (and the entire DVST assembly) from my working 4051. I tried to see if I...
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    The datasheet on the WS57C49 lists the Unipack 2...

    The datasheet on the WS57C49 lists the Unipack 2 or 2B version 9 or later as a compatible programmer. I have a plain Unipack (not 2B but I think is the same as a Unipack 2) I think is version 9 (if...
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    Yes, the microcode sequencer performs a self-test...

    Yes, the microcode sequencer performs a self-test (page 6-10 General theory of operation) and then "addresses the switch bank of ROM space". And then checks and executes the Diagnostic ROMpack it...
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    Yes, I had looked at using U845 & U863 patch ROM...

    Yes, I had looked at using U845 & U863 patch ROM sockets with a 27256 adapter. One problem may be that the ROM addressing is not contiguous. The ROM pair at U810 & U893 sit at the top of the RAM...
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    Thanks Monty! I have completed dumping and...

    Thanks Monty! I have completed dumping and comparing all of the ROM's. I found that I have 3 bad ROM's. U870 (odd rom 4000-7fff), U825 (Even rom 8000-bfff), and U885 (odd rom c000-ffff). All...
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    I made progress reading my ROM's. In short, I...

    I made progress reading my ROM's. In short, I found U870 is bad. To read them, I had remembered the the original IBM PC (5150) used 24 pin ROM's for the BIOS and ROM Basic. I verified this by...
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    Yes, I see looking at the timing diagrams for the...

    Yes, I see looking at the timing diagrams for the MK36000, like you and Frank stated it would need to cycle /CE on every address change to get the correct data out. I am probably seeing only the...
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    Thanks for your replies. I have read through...

    Thanks for your replies. I have read through the "saving ROM data from 4052" blog before, but I have been going through it again. It led me to believe the next step would be to read and verify...
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    Tektronix 4052 help....

    I have a Tek 4052, or at least most of one, I'm missing the tape drive and some of the case parts. I received it mostly as parts. I'm trying to bring it back to life. I currently have it set up...
  17. After completing the NOVRAM reset and motor...

    After completing the NOVRAM reset and motor calibration I found it was necessary to do the "Drive Type Utility" setting it to "Tower" instead of "desktop". It now loads tapes and passes the read /...
  18. Yes, I found it on Bitsavers and other locations...

    Yes, I found it on Bitsavers and other locations along with the PC DOS software to interface through the parallel port. Resetting the NOVRAM seems to work properly, the spindles rotate as indicated...
  19. Did you ever find a service manual for this...

    Did you ever find a service manual for this drive? I have an OD3201 that has problems. It has a hard time loading tapes, like it seems to have a hard time rotating the spool. I can sometimes get...
  20. 4051 rtc

    I have the 4051 version of the TransEra RTC, model 641-RTC. I have a dump of the EPROM if anyone is interested. It doesn't have any PAL's and it's built around an AM8253 with a few 7400 series chips...
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    All of the backpack ROM's on my site are all -01...

    All of the backpack ROM's on my site are all -01 revision.
    - Clay ;)
  22. Thanks! Now I just need to find the 4051...

    Thanks! Now I just need to find the 4051 version of the 4907 File Manager ROM Pack....
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    I had to adjust the directory rights. They...

    I had to adjust the directory rights. They should download now.
    I have several manuals I would like to upload to Bitsavers. What are the requirements of the PDF's and other files, & how do I...
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    I have a working 4924 and have dumped the ROM's. ...

    I have a working 4924 and have dumped the ROM's. I also have a 4907 but I don't have the File Manager ROM Pack for the 4051. I have dumped the ROM's and will post images at...
  25. The 4907 ROM PACK requires the 4907 File Manager...

    The 4907 ROM PACK requires the 4907 File Manager to be attached to the GPIB for the functions to work, otherwise they will just return the errors that you were getting. Can you post a dump of the...
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