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  1. Replies
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    In short. TC01 = transistors ( 0 and -3V logic...

    In short. TC01 = transistors ( 0 and -3V logic levels). TC08 = TTL.
  2. Replies
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    Fantastic work! Really would like to see the...

    Fantastic work!

    Really would like to see the DECtapes spinning, the TC02 flickering and the sound of the ASR33 in a video. Please!
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    I happen to come across this picture which...

    I happen to come across this picture which matches (i think, I have no idea of the IBM numbering scheme) four of the shiny metal cubes in the PSU:

    http://ummr.altervista.org/images/IBMSLT.jpg
    ...
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    Thanks for all ideas! I have replaced the...

    Thanks for all ideas!

    I have replaced the chopper transistors with 2N6547 which are a quite common SMPSU transistor in DEC equipment. Should be quite oversized for this application I think.

    I...
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    I add a picture to show what I am fighting: ...

    I add a picture to show what I am fighting:

    https://i.imgur.com/MexGosO.jpg

    I have checked resistors in circuit. There are none that are terribly out of spec. Of course I cannot only tell if...
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    IBM 5110 power supply schematics?

    A friend of mine got an IBM 5110 which was dead and I am trying to help out. It blows fuses. First he told me the transformer was short circuit. When I looked at the PSU I recognised that it was a...
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    RL02 (and RL01) uses embeddded servo information...

    RL02 (and RL01) uses embeddded servo information between tracks. This info cannot be written by the RL02 itself but has to be written at the factory. That means that packs without that info wouldn’t...
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    IBM 5110 transformer?

    A friend of mine is trying to repair a IBM 5110. He is convinced that the transformer is bad.

    Anyone knows the spec of the transformer?

    Someone that has a spare?
  9. Replies
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    I am not sure what kind of proof that is....

    I am not sure what kind of proof that is. Explain! I connected it to my MAC through a IDE / USB bridge and dumped it using dd. It gave me a 131334144 bytes file. Now 1002 * 8 * 32 *512 is exactly...
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    I know that you said that the install should be...

    I know that you said that the install should be done on the machine. In this case it was not entirely possible since FORMAT /S failed. However as I wrote I am able to READ and WRITE to the CF card on...
  11. Replies
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    Yet more problems... Both XT-IDE boards now...

    Yet more problems...

    Both XT-IDE boards now work fine with the 32 mbyte CF card with MS-DOS 3.10.

    Then I had a second CF card, a 128 Mbyte, that I thought I would configure as well. But I have...
  12. A well designed cache mechanism would probably...

    A well designed cache mechanism would probably help a lot. Many old designs were very memory oriented. The TMS9900 is one design. A good idea when memory is fast compared to processor. Later models...
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    I first tested the 74LS04, 74LS32 and 74LS138 in...

    I first tested the 74LS04, 74LS32 and 74LS138 in the chip tester and they verified fine so no obvious problems there. Although I replaced them with a new set of tested chips. The resulting output...
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    175,917

    I have now put the xtidecfg utility on a floppy...

    I have now put the xtidecfg utility on a floppy along with the binary, ide_xt.bin.

    Fiddled around in the menus and tested the autoconfigure. But it didn't detect the board....
  15. Replies
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    The GW XTIDE rev 3. Oops! This is...

    The GW XTIDE rev 3.



    Oops! This is something I didn't do. I just programmed the EEPROM in my EPROM programmer. Will look into use of XTIDECFG.com program.



    No, not this is the first time...
  16. Replies
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    Need some assistance on how to best...

    Need some assistance on how to best troubleshooting why I cannot get my two XT-IDE rev 3 boards working. I bought bare boards and populated them myself using ICs from my parts drawer which mostly...
  17. Replies
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    There should be a number of unused NCR tapes...

    There should be a number of unused NCR tapes left. They were still in plastic bags when I got them. Came from a guy in Morocco! But storage in the moroccian desert has had effect on them since they...
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    The problem I had with Verbatim T300 in a TU60 is...

    The problem I had with Verbatim T300 in a TU60 is that he original pressure pad is made of foam with a thin sheet of filt on it. The foam is not as good as it once was of course. I replaced it with a...
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    Acetone can probably also be used. It will also...

    Acetone can probably also be used. It will also dissolve PVA. But it has a much lover boiling temperature. Around 50 degrees centigrade while butylacetate is around 120. This means aceton will...
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    I have successfully used butylacetate to dissolbe...

    I have successfully used butylacetate to dissolbe PVA in my VR201. Used a ink cartridge syringe to inject butylacetate inbetween the CRT and the front screen. After a week the PVA was dissolved and...
  21. When I restored my TU60 I happened to find idler...

    When I restored my TU60 I happened to find idler tires for a tape recorder which had the correct dimension. It worked very well!
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    I have built several of Jacks extenders. Not with...

    I have built several of Jacks extenders. Not with the original DEC connector though but a more standard EDAC connector. The difference is that it is not tight fit so you could insert push on the...
  23. I once had a set of manual of the UCSD p-system...

    I once had a set of manual of the UCSD p-system for the Texas Instrument Professional PC. I have scanned them and then some guy in Germany has taken car of them. Here is a link to the scanned files:...
  24. A difficulty with the TU60 is to find tapes that...

    A difficulty with the TU60 is to find tapes that work with it and tapes that last. The original tape had this special notch and also a blank leader. Then the tape itself was quite sturdy. I tested...
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    It is a Sprague 30D 75 UFD 6VDC. ...

    It is a Sprague 30D 75 UFD 6VDC.

    https://www.mouser.se/datasheet/2/427/te-1291517.pdf
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