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    So here's what I know. The bad drive will not...

    So here's what I know.

    The bad drive will not properly read disks formatted/written by other drives. It will occasionally do a directory for one but that's about it.
    I can format disks on the...
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    The part I can't figure out in my case is why the...

    The part I can't figure out in my case is why the working drive is able to read what the 'bad' drive is creating no problem. I thought with alignment issues, if you formatted and wrote stuff on a...
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    So not quite out of the woods.. one of the drives...

    So not quite out of the woods.. one of the drives does not work quite right. It can format, write and read its own disks. It can sort of read the directory on some disks. It cannot read files. ...
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    Yeah I was looking for the right manual to cover...

    Yeah I was looking for the right manual to cover that but haven't found it. That's kinda silly! At least I can get around it with the MODE command though.

    I was trying to find some software that...
  5. I've bought from vcm on occasion. I can't figure...

    I've bought from vcm on occasion. I can't figure out if the guy is a genuine enthusiast or just a huckster who has glommed onto a hobby to make a few bucks.

    I can't begrudge him too much I...
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    Answered my own question again.. maybe. ...

    Answered my own question again.. maybe.

    Apparently you use MODE COLOR and that switches it. Seems kinda a silly way to do things though... if you delete your autoexec file or whatever you're...
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    I changed out the original Tandy 2000 boot disk I...

    I changed out the original Tandy 2000 boot disk I got with the machine and switched to a disc I'd made via an image off the net. It boots too, but same thing - no text. Even in BASIC.

    Only on...
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    Tandy 2000 High Res Color problems

    Okay so now we're onto my next quest. The T2000 boots, however, for some reason it loses all text. It definitely works -- I can do DIR, etc and the drive reacts. I can run BASIC, and BASIC will...
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    Answered my own question. The answer is no -...

    Answered my own question.

    The answer is no - that 7414 has a bad inverter. Swapped out.. voila.. it boots. :) Track 0 matters, apparently.

    Thanks for all the help everyone. Now I can get my...
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    Thanks Chuck. Yes I checked the 12V it looks...

    Thanks Chuck.

    Yes I checked the 12V it looks just fine.. it's coming up about +11.89V and seems pretty stable.

    I may try what you've suggested there with testing the drive. I did install it in...
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    Also.. I'm not sure if I demonstrated anything...

    Also.. I'm not sure if I demonstrated anything useful by doing this and hopefully didn't harm anything by doing so, but I used a jumper to bridge pin 7 and 13 on U135 briefly at boot time. When the...
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    Okay. Well I've tried both singly, set to...

    Okay.

    Well I've tried both singly, set to Drive 0, terminator installed (swapped between them for testing), and they both do exactly the same thing, as in my original video. Over an over again.
    ...
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    These are the drives as they are configured now:...

    These are the drives as they are configured now:

    https://drive.google.com/file/d/1t05bCbSGhFtJKA8uEhRTvGZZAGEVjXBy/view?usp=drivesdk
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    Yes sort of.. the only part I'm not understanding...

    Yes sort of.. the only part I'm not understanding is how the Track 0 process works. Ie if the 765 generates that to force the drive to find it, or if it sort of waits to hear from the drive that...
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    Yeah I totally buggered that explanation up. ...

    Yeah I totally buggered that explanation up. Never work on electronics while under the influence of nerve pain meds.

    I'll try to describe as best I can.

    For DIR, I can see a low logic signal...
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    Hi Chuck, I do observe state changes on pins 1...

    Hi Chuck,

    I do observe state changes on pins 1 and 2 of the 7416. However on pins 3 and 4, pin 4 on my logic probe shows HI no matter what, and only a brief pulse as pin 3's state changes. I...
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    Yes I have piles of good quality DSDD disks. ...

    Yes I have piles of good quality DSDD disks.

    On my first try with formatting I saw the head move back. Curious, after the error I moved it forward again gently and then reinsert the disc and...
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    Yeah its an untwisted cable with the drives...

    Yeah its an untwisted cable with the drives jumpered for 0 and 1.

    And no, the drive will not format as Drive B on the T1000. Just says track 0 bad.
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    Okay so neither drive reads anything on the...

    Okay so neither drive reads anything on the T1000, but they do seem to try to seek Track 0.
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    Yeah I don't see the head really move backwards...

    Yeah I don't see the head really move backwards or seek Track 0 at all. If you watch the video you can see it does slightly move backwards after each lurch forwards but that could just be tension...
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    I don't think so. I think it just starts moving...

    I don't think so. I think it just starts moving from wherever it happens to be.
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    I successfully made a new boot disk just on 5.25...

    I successfully made a new boot disk just on 5.25 media.. but same deal. It just does this over and over again until the head is as far as it can go.

    https://youtu.be/78c7SAXtDzc

    I'm becoming...
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    If you're willing to provide that I would be...

    If you're willing to provide that I would be grateful. First trick though is remembering which of my PCs works with IMD. Ive tried two now that are Pentium and P2 class with no luck. Gotta keep...
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    IMD always seems to need much finaglement from...

    IMD always seems to need much finaglement from me. It is *very* particular about which hardware it runs on. Now I just gotta remember which one worked last time.. :)
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    Darn. Yeah.. that's what I was afraid of. You...

    Darn.

    Yeah.. that's what I was afraid of. You almost need a second, working 2K as a test bed. Another option as I understand it is I can use a 720k 3.5 drive with these. Maybe do an image of...
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