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Type: Posts; User: dkarguth

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    Tandy TRS-80 Model II Issues

    I am trying to restore a TRS-80 model II and have run into this problem.

    58675
    (sorry about the garbage picture, the phone camera wouldn't cooperate with the CRT refresh rate)


    When I power...
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    Unfortunately, I do not have a V20 to try....

    Unfortunately, I do not have a V20 to try. However, it is a future project idea.
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    In Redmaus's defense, he was very generous when I...

    In Redmaus's defense, he was very generous when I contacted him to let him know he had a couple of proprietary keyboards for a system of mine. I picked up two TI Professional Computers, and handed...
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    Can confirm it's from a deskpro 386. I have a few...

    Can confirm it's from a deskpro 386. I have a few of those boards.
  5. For me, the amber CRT is part of the charm of...

    For me, the amber CRT is part of the charm of having the 5155. However, if you were so inclined, I would bet you could swap the entire CRT assembly with an assembly from one of those common 9" CRT...
  6. I seem to remember the one on the neck board...

    I seem to remember the one on the neck board being low-esr, along with one or two other caps on the HV board.
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    I doubt it will actually have a huge impact as...

    I doubt it will actually have a huge impact as most of those people most likely are from out of the DFW area and probably just joined to have access to the info.
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    I noticed you are from Texas, did you happen to...

    I noticed you are from Texas, did you happen to get those 5161s from Computer Reset?
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    That is a typical raster pattern of a 5151...

    That is a typical raster pattern of a 5151 without an input signal. Your monitor appears to be at least partially functioning. There will be missing pins on the connector, as MDA only has four pins....
  10. Do you have an oscilloscope? It's a must-have...

    Do you have an oscilloscope? It's a must-have when messing with monitors. Be careful with that thing, CRTs can be lethal if you accidentally touch the wrong thing. Stay away from the anode cap, the...
  11. ST-225s and ST-251s are some of the most reliable...

    ST-225s and ST-251s are some of the most reliable hard disks ever made. I picked up 8 from Computer Reset a few weeks ago, and all of them work flawlessly with perfect bearings. They were so reliable...
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    I have a rether large set of SIPPs, probably at...

    I have a rether large set of SIPPs, probably at least 25 or 30. What capacity are you looking for? 1 meg sticks?
  13. I'm by no means a PDP expert, but normally those...

    I'm by no means a PDP expert, but normally those knobs either have a small setscrew that needs to be loosened, or they simply pull off.
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    I assume this was discarded weeks ago?

    I assume this was discarded weeks ago?
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    Even simpler than that, if you get a standard...

    Even simpler than that, if you get a standard simm socket (the kind that stand straight up) it fits right into the sipp socket without modification. That way you can just put your simms into the simm...
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    If I'm remembering correctly, the hard disks that...

    If I'm remembering correctly, the hard disks that IBM used in the ps/2s of that era were not normal ESDI, but actually attached straight to the MCA bus. The controller was directly on the disk. The...
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    I have 4 NOS memory expansion boards, and have...

    I have 4 NOS memory expansion boards, and have access to more. Just let me know if you want any and I'd probably part with a couple.
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    Honestly in my opinion, Compaq had far superior...

    Honestly in my opinion, Compaq had far superior machines at the time, both with respect to technological advancement, serviceability, and in some cases build quality. Take the IBM 5155 VS the Compaq...
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    That goes the other way too. With minor...

    That goes the other way too. With minor modification, the IBM 5175 Professional Graphics Display is capable of displaying 640x480 VGA with surprisingly good results
  20. I disagree with you there. Those old monitors,...

    I disagree with you there. Those old monitors, when maintained, will last many more decades. Also, using an LCD kinda ruins the experience for me, but that's just my opinion.

    If you want VGA...
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    I also have two of those, but you'd have to pry...

    I also have two of those, but you'd have to pry them out of my cold dead hands. Not selling those in my lifetime.
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    No, it just outputs a standard analog RGB signal...

    No, it just outputs a standard analog RGB signal with a composite sync. If you have a monitor that can handle the composite sync, it will work. You can also make a sync separator circuit as well, and...
  23. WTB IBM Options and Adapters Technical Reference set

    Basically as the title states. It's a two volume set of light blue binders in IBM sleeves.
  24. I have a hardcard 20 that I'm not willing to part...

    I have a hardcard 20 that I'm not willing to part with, but if you would like, I can make a fairly accurate CAD file of it. I'm moderately experienced with fusion 360.
  25. I have a copy of Compaq dos 3.3, is that close...

    I have a copy of Compaq dos 3.3, is that close enough for your taste?
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