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Type: Posts; User: TRS-Ian

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  1. Replies
    13
    Views
    674

    On the 4P the light in the power switch is wired...

    On the 4P the light in the power switch is wired before the mains connection to the PSU, so the upshot of that is the red light on the power switch comes on even with a dead PSU or blown fuse on the...
  2. Replies
    13
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    674

    The power distribution connector on the PSU...

    The power distribution connector on the PSU should be re-soldered. Examine it with a magnifying glass and you might see dry solder joins.
  3. Replies
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    613

    yes the Model 4 boards are all orangey-brown in...

    yes the Model 4 boards are all orangey-brown in colour and the Model III are all greeny-white in colour.

    Model 4 boards have more semiconductors on them whereas the Model III board is purely...
  4. Replies
    8
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    613

    Vertical sync is out or lost, what you can see on...

    Vertical sync is out or lost, what you can see on the screen is Diskette? or Cass? not locked into sync. It's not going to be caps or power transistor related.

    I see your Model 4 has a Model III...
  5. Replies
    12
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    999

    Those Teac FD-50 drives are very old and were...

    Those Teac FD-50 drives are very old and were originally used by Radio Shack in export Model I 26-1160 and 26-1161 240V drive units.

    They are not a good choice for the Model III because they only...
  6. Replies
    7
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    594

    When I think a drive is beyond help, I try...

    When I think a drive is beyond help, I try drastic things for sh*ts and giggles, have had a few Tandon and TPI drives come good (for a while at least) with the stiff stepper motor. After making sure...
  7. Replies
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    594

    I might have some spare stepper motors for drives...

    I might have some spare stepper motors for drives I have parted out for drive motors, logic boards and doors. Let me know if you want me to look.

    Ian.
  8. Thread: 4P CRT swap

    by TRS-Ian
    Replies
    9
    Views
    1,075

    You can put a green CRT from a later 4P in no...

    You can put a green CRT from a later 4P in no probs. I've done it many times
  9. Replies
    13
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    2,520

    Even if the FDC is good if there is no floppy...

    Even if the FDC is good if there is no floppy drive connected or when the FDC queries the floppy drive it doesn't receive back the response it expects then it will return Cass? to the screen on boot...
  10. Replies
    2
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    627

    Nice job bud!

    Nice job bud!
  11. Thread: Ansiterm

    by TRS-Ian
    Replies
    2
    Views
    373

    Not needed on the RS board and yes it's really...

    Not needed on the RS board and yes it's really snowy when scrolling.

    Are you coming to TA19? It would be good to meet you finally
  12. Anyone landing in Dayton on Wednesday night and...

    Anyone landing in Dayton on Wednesday night and hiring a car or hailing a cab to Springfield?
  13. Replies
    6
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    701

    Hold you head high, Mr Argent ;-) Yes you need...

    Hold you head high, Mr Argent ;-)

    Yes you need to change C33. J3 will take a bunch of heat and solder since the pins are so thick. I new connector may help, as your current J3 connector looks a...
  14. The filter just pops off. I don't know about...

    The filter just pops off. I don't know about polishing it but I would be keen to know because several of mine have scratches.

    The tube is green, not the filter.

    The screen adjustment pots...
  15. This seems like a good place to post my request...

    This seems like a good place to post my request :-)

    Is anyone flying in to Dayton then heading out to Springfield on Wednesday 9/25 in the evening? I was wondering if anyone was hiring a car or a...
  16. Replies
    3
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    476

    The tubes themselves rarely give out. As they...

    The tubes themselves rarely give out. As they wear out the picture gets more and more blurry but usually they keep running.

    The same can't be said of the video board, which, like any electronic...
  17. Replies
    6
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    1,355

    They should work and there is no harm if you...

    They should work and there is no harm if you install them and they don't work...

    Early Model Is came with slower rams (300 or 350ns) but most have 200 or 250ns, and that is the same speed...
  18. Replies
    3
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    440

    No worries, just email me. ianm@trs-80.com

    No worries, just email me. ianm@trs-80.com
  19. Replies
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    440

    It's normal on my 4Ps even when auto booting from...

    It's normal on my 4Ps even when auto booting from a FreHD using the original 1.16 boot Rom.
  20. Error 07 is usually when you are using a boot...

    Error 07 is usually when you are using a boot disk different to the version of the operating system on the hard4-0 file. Eg. trying to boot with an LS-DOS boot disk and a LDOS hard4-0 file and...
  21. Pocket computers and the Model 1000 were sold by...

    Pocket computers and the Model 1000 were sold by their original manufacturers in other countries.
  22. Replies
    4
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    541

    Gentlemen, I've seen this a couple of times...

    Gentlemen,

    I've seen this a couple of times now. Firstly with Taos23 the problem you are describing almost always comes down to a dirty bus connector on the Model 4 motherboard. I can have grey...
  23. Thread: Model 4 Font

    by TRS-Ian
    Replies
    26
    Views
    2,090

    That's a non-gate array board so make sure when...

    That's a non-gate array board so make sure when people are advising you chip numbers and schems you are dealing with the right board.

    U23 is the character generator so try a different one. U21 is...
  24. Thread: Model 4 Font

    by TRS-Ian
    Replies
    26
    Views
    2,090

    Is U23 a socketed 24-pin chip on your motherboard?

    Is U23 a socketed 24-pin chip on your motherboard?
  25. Replies
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    630

    CocoSDC is the SD based cart you are thinking of....

    CocoSDC is the SD based cart you are thinking of. Google it and/or it's maker, Ed Snider to order one.
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