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  1. I had consulted the Tandon manual, which...

    I had consulted the Tandon manual, which described the options for jumpers. Beside drive select (0...) the options are multiplex (for single-drive systems, not applicable here), power saving and...
  2. Case came apart and I retrieved the offending...

    Case came apart and I retrieved the offending drive. It is an IBM-branded Tandon T100-2A. In accordance with Larry's practice, before installing I had removed the T.RES IC and substituted an...
  3. Thanks to you both for your suggestions. I am...

    Thanks to you both for your suggestions. I am now left with no other option but to remove the cover as d:1 is no longer responding to any commands.

    I'll report back when I have more concrete...
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    See attached. -CH- 64838

    See attached.

    -CH-

    64838
  5. Model 4 with DSDD issue: RatBastard strikes again!

    Let's skip over the sad story about a Model 4 that was inhabited by mice for 20 years and cut to the chase:

    After many labors I now have a working Model 4 GA that has several new or refurbished...
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    Eadweard Muybridge, Horse in Motion, 1877. Used...

    Eadweard Muybridge, Horse in Motion, 1877. Used 21 cameras to answer the question of whether a horse ever was in motion with all four feet off the ground.

    Wiki:...
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    A 4x5 Calumet view camera. There is no...

    A 4x5 Calumet view camera.

    There is no digital equivalent - of which I am aware - as a sensor that size is prohibitively expensive. viz:...
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    Once upon a time - when film was used for imaging...

    Once upon a time - when film was used for imaging and produced the most "realistic" results - the single-lens reflex camera (SLR) was considered the best option by most photographers because of its...
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    The good news: Your computer is essentially sound...

    The good news: Your computer is essentially sound and probably trying to boot from drive :0. What you describe is a computer in the boot process.

    The bad news is that you can't see the messages...
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    Rotational speed is set by a variable resistor on...

    Rotational speed is set by a variable resistor on the drive controller board. There are software utilities to report the speed of the rotation or you can use a scope or frequency counter to check...
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    Of course. Can you suggest a circuit? -CH-

    Of course. Can you suggest a circuit?

    -CH-
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    Larry is a great resource, as are Peter...

    Larry is a great resource, as are Peter Cetinski, aka "pski", and "Eudimorphodon", "shank" and a host of others. And then there's Chuck(G) who knows everything about everything. You're in good...
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    The Model III CRT board is green and has a...

    The Model III CRT board is green and has a different layout from the Model 4 board, which is tan. They are not interchangeable, although early Model 4s used the Model III video board while later...
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    Tandy built the Model III in several...

    Tandy built the Model III in several configurations, to meet different price points. If you got one with 16K and no disk drives (a "Cassette" model) you got one PSU and no controller boards, either...
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    Congratulations on your acquisition. No surprise...

    Congratulations on your acquisition. No surprise about the condition, but of course it will run again, given enough resources. You will need information and some spare parts, which can be obtained...
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    At the risk of further roiling the waters: The...

    At the risk of further roiling the waters: The delivery chain involves many stops and any of them can introduce damage. Yes you can make the package bulletproof, but to do so adds weight and size...
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    Thanks for your suggestions. If anyone has a...

    Thanks for your suggestions.

    If anyone has a use for this, PM me: It's yours for the price of postage.

    -CH-
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    As the current record-holder, I am loath to cede...

    As the current record-holder, I am loath to cede my title.



    Find a like-minded soul with a TRS nearby and make copies as soon as is practical.



    You just can't make an "educated guess"...
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    Mystery Connector

    Included with a PC-2 was an RS-232 I/O unit. Also included was the cable illustrated below. One end is a D-SUB 25 (with only 4 pins) and the other a DIN. I'm wondering what the DIN was supposed to...
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    I have two of the Chuanganzuhuo USB floppy 1.4...

    I have two of the Chuanganzuhuo USB floppy 1.4 drives, each attached to a Win10 machine, and both are able to read from and write to floppy disks. Another brand of drive I tried earlier was not...
  21. Thread: Tandy Assembly

    by clh333
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    Tandy Assembly

    Like many of you I was disappointed to hear that this year's Tandy Assembly will not be held. It was scheduled for October 30-November 1 and I had planned to attend.

    The reasons for...
  22. To answer my own question: RTFM. MMCPM comes...

    To answer my own question: RTFM. MMCPM comes pre-configured to provide certain missing keys (ESC, for example, is invoked with CTL-CLEAR) and has two utilities for modifying key definitions: CONFIG...
  23. MMCPM - A Shout-Out and a Question (of course...)

    Earlier this year when I acquired the NGA Model 4 Larry Kraemer suggested I investigate Montezuma Micro CP/M for the TRS-80. Having owned Kaypros previously I was acquainted with CP/M 2.2, so some...
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    Time will tell, thanks. Gotta find another...

    Time will tell, thanks. Gotta find another recorder, it seems.

    -CH-
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    As the world turns, Chapter LXVII: Created a...

    As the world turns, Chapter LXVII:

    Created a three-line BASIC program on the Model 102 and saved it to tape, first using the default format and then as ASCII. Verified the audio on the CCR-81. ...
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