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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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    Many thanks. The problem seems to be eerily...

    Many thanks.

    The problem seems to be eerily similar to the issue I had with my Tandy 1000. In that situation, a bad gate in a 7432 (I think) was preventing the drive from actually trying to read...
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    Darn.. that wasn't the issue. Oh well. Was...

    Darn.. that wasn't the issue. Oh well. Was hoping for a quick win there. At least I know the main FDC chips are good. I *think* the drives are okay, although I haven't found a way to test them...
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    Doh.. Typed me numbers backwards. Thanks for the...

    Doh.. Typed me numbers backwards. Thanks for the catch and the answer Chuck!! :)
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    Tandy 2000 FDC chip question

    I have a Tandy 2000 that will not boot. It gamely tries to read disks (which seem to be good), but basically on boot it will just move the head up towards the center of the disk, stop, then move it...
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    Apricot F2 Keyboard

    Picked up a working Apricot F2 for not very much at all.. but sans keyboard which I understand is a proprietary wireless deal. If anyone out there has one they'd not mind parting with please let me...
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    What sort of oil/grease would be recommended for...

    What sort of oil/grease would be recommended for this sort of thing?

    The disk doesn't seem to spin until you insert the disk and engage the drive. It does seem to center better when the motor is...
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    Interesting. I had a last minute thought. I...

    Interesting.

    I had a last minute thought. I swapped the old FDC chip back in. Drive stopped working, but keyboard worked! Wha...

    Luckily I bought 2 FDC chips.. plugged the other one in.. now...
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    Okay so I got a replacement FDC9216 (or was it...

    Okay so I got a replacement FDC9216 (or was it 8216) chip, and it boots! Fantastic! Thought I could finally put this together, get it off my bench and carry on with my play space renovation.
    ...
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    Thanks maxtherabbit! You're referring to the...

    Thanks maxtherabbit! You're referring to the shaft and spring between the 'plate' and the cone?

    The cone looks like it goes down smoothly every time, no shifting. Only thing that seems to...
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