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    Model 25 - whole or parts

    My next project is going to be a PS/2 Model 25.

    I would like to end up with a working 286 model.

    I have a chassis and working color monitor, looking for pretty much everything else!

    Whole...
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    Almost there! Machine is working good in the...

    Almost there!

    Machine is working good in the 4D case. I have swapped the original 4 badge over, a 4D badge on this computer is kind of like an SVT badge on a v6 mustang.

    Swapped the 4D's TEC...
  3. I have been running this since the 19th, no...

    I have been running this since the 19th, no glitches, no failure to report correct free space.... and no waiting 45 seconds after a DIR command!

    Thank you Chartreuse.
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    5160 + keyboard + monitor on Goodwill

    Obviously not mine.

    Only $25 shipping lets you spend an extra $50-100 on the machine vs ebay prices

    https://www.shopgoodwill.com/Item/113575299
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    I identified a 'only when cold' issue on another...

    I identified a 'only when cold' issue on another system by spraying each component with an upside down can of canned air. Maybe not the best for an intermittent problem, but it sure identified the...
  6. Now that I've worked around that issue,...

    Now that I've worked around that issue, FREESP.COM works great.

    I'm looking forward to the TSR version, more so if it can be loaded high. Can't waste that conventional ram!
  7. Fun fact of the day, the version of TLINK on my...

    Fun fact of the day, the version of TLINK on my 8088 machine is too new to actually run on the real hardware. I guess I've always assembled and linked in a virtual PC then flashed the drive image...
  8. Keep working on this. A small TSR will really...

    Keep working on this. A small TSR will really help those of us with large CF drives on 8088 systems!
  9. I found other products and parts from Cybernex,...

    I found other products and parts from Cybernex, all terminals.
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    Then it did go to a VCF member. Not me, but...

    Then it did go to a VCF member. Not me, but definitely a member.
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    If anyone is keeping track, that Model 25 with...

    If anyone is keeping track, that Model 25 with the 286 upgrade board went for $660 + shipping (would ave been about $100 to me).
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    Here is the link to "TRS8BIT - volume 06 Issue 02...

    Here is the link to "TRS8BIT - volume 06 Issue 02 - June 2012" which has Ian's article on TRS-80 CRTs and controllers.

    https://www.muppetlabs.com/~breadbox/software/trs8bit0602.pdf
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    4D / 4P CRT card in M3/M4

    A little information, buried in my Model 4 thread.

    We know there are 3 CRT card designed used in the M3 / M4 / 4D /4P.

    First is the analog card used in the M3 and maybe early M4s. This has the...
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    Any of the above. There is a replacement power...

    Any of the above.

    There is a replacement power panel available which has an IEC inlet for a standard power cord as well.

    Jay Newirth (Newsoft) makes the panel, its the 2nd to last item on his...
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    A step forward again. Swapping the cases is...

    A step forward again. Swapping the cases is relatively easy.

    The CRT card harness from the 4D which must be used with the 4D CRT card has a different power input connector for the newer style...
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    It would help greatly if we knew your location....

    It would help greatly if we knew your location. Keep in mind this is a very multinational forum so finding semi local help is easier if we know where you are.
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    After a little fighting, and reading, and...

    After a little fighting, and reading, and fighting and tracing wires....

    the 4D/4P have the two pots for brightness and contrast wired slightly differently than the 3/4.

    The end result, to use...
  18. Back to the OP's questions ... The battery...

    Back to the OP's questions ...


    The battery slot would make a great place to keep the CF card, and "mangling" a card bracket would be a neat and quick way of mounting.

    The PS exhaust dumping...
  19. Is there a common address/IO decoding circuit...

    Is there a common address/IO decoding circuit that would be used on most boards? Maybe something for Rev B (Not V2, the card plainly says Rev A).

    Just thinking of some S100 prototyping boards I...
  20. SpeedStor, not Speed Store. ...

    SpeedStor, not Speed Store.

    http://www.minuszerodegrees.net/software/speedstor.htm
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    I was the 2nd bidder, but its not exactly what I...

    I was the 2nd bidder, but its not exactly what I want in a Model 25 and I'm sure the 286 upgrade card will take the price way past what is reasonable. I've already been outbid, I'm cheap, what can I...
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    I knew I read that somewhere. The pinout from the...

    I knew I read that somewhere. The pinout from the 3/4 board to the 4D/4P board changes. All I need to do is repin. I hope.
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    Next problem..... cleaned the top enough that my...

    Next problem..... cleaned the top enough that my wife allowed it in the house. Plugged into my 4 and.... very bright raster. brightness/contrast knobs do nothing.

    Am I missing something, is the...
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    Parts are here. 4D case, TEC drives, CRT card...

    Parts are here.

    4D case, TEC drives, CRT card and Green CRT.

    Survived the trip, definitely been on a shelf for years, as described!

    65820
    65821
    65822
    65823
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    What would be at 3E00 ? Is that one of the FreHD...

    What would be at 3E00 ? Is that one of the FreHD ROMS, or is that a ROM onboard the EI

    I know nothing about Model 1's, just recognized the 15872 as 3E00 hex due to some coding I was doing that...
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