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Thread: Anyone modded their Tandy 1100FD?

  1. #1
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    Default Anyone modded their Tandy 1100FD?

    I've disassembled my 1100FD to replace the drive belt, which didn't work, I think I bought the wrong belt.

    While I have been poking around in here, I've noticed there is a LOT of empty space to work with.

    The obvious mod is to replace the (non-working) matsushita drive with an HXC/gotek device. I've picked up some flat ribbon cable connectors and will build an adapter, should be pretty straightforward. I am going to re-route the switches and usb cable and mount them in the metal back panel normally reserved for the 2400 baud modem, which I sadly don't have.

    The second mod I'm considering is replacing the 6v lead-acid battery with a set of nimh or lithium ion cells. I expect the charging circuitry will be incompatible and probably blow the battery up, which would really be a poor outcome in all respects. The easiest way might be to use a cellphone battery pack that can be charged and discharged at the same time and add a little micro hdmi tail or port; would 5v output be sufficient? I'm not sure what the discharge profile looks like for a lead-acid battery, 5v may be too low.

    Third mod would be adding a hard drive; I notice there's a set of solder pads for the 1100HD's hard drive; are these functional? Can an interface be added for xt-ide? Any chance that's an ISA bus? It's only 50 pins, so that's unlikely. It is, however, the number of pins on a compact flash card.

  2. #2

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    Please keep us all updated on how this turns out, especially the battery idea. I have 1100's and an 1110's and in a few of them Ive put new belts on the floppy drives, in an effort to keep them original, but I also have a couple where I retrofitted a belt-free floppy with a handcrafted adapter cable, based on docs that I found online, so I suppose that qualifies as a mod, although a kinda lame one.

    I have another 1110 that has a bad HD and was unable to get even that to use a CF card, there was a thread here
    http://www.vcfed.org/forum/archive/i...p/t-43861.html
    that discussed the issues that seemed to be an obstacle to getting that mod working. Maybe a fresh pair of eyes...?

  3. #3
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    Quote Originally Posted by Juror22 View Post
    Please keep us all updated on how this turns out, especially the battery idea. I have 1100's and an 1110's and in a few of them Ive put new belts on the floppy drives, in an effort to keep them original, but I also have a couple where I retrofitted a belt-free floppy with a handcrafted adapter cable, based on docs that I found online, so I suppose that qualifies as a mod, although a kinda lame one.

    I have another 1110 that has a bad HD and was unable to get even that to use a CF card, there was a thread here
    http://www.vcfed.org/forum/archive/i...p/t-43861.html
    that discussed the issues that seemed to be an obstacle to getting that mod working. Maybe a fresh pair of eyes...?
    That is interesting; the 1100HD connector near the hard drive looks NOTHING like the empty solder pads on my 1100FD. I wonder if the 1100FD solder pads have some other purpose? I should trace them.

  4. #4
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    5v seems to be insufficient voltage to run the 1100FD.

  5. #5
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    SLA batteries have a cutoff voltage @ 5.5V or there about.
    Wanted: Any old clunky 286-P1 machine that has some kind of working battery or replaceable with off the shelf parts. Preferred: 10+lbs 386 machines.

  6. #6
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    Quote Originally Posted by twistedpneumatic View Post
    SLA batteries have a cutoff voltage @ 5.5V or there about.
    Yeah, that was my guess to begin with.

    I'm going to pick up something like this and try again:

    https://www.pololu.com/product/2566

    It has built-in reverse current protection, which would keep the on-board SLA charging circuit from damaging the lion battery bank, right?

  7. #7

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    Apologies for resurrecting a thread here...
    I just picked a 1100FD to add to my project pile along with a Tandy 1500HD.

    The battery on the 1100FD is easy to do with some 18650s, a 2s BMS and a small buck converter. Should work off the built in charger, too.
    The SLA discharge curve on a 6v battery ranges from 6 to 6.4v though while charging can be as high as 7.2v so it doesn't need to be an exact science. Ill be happy to post results if anyone is interested though I am generally pretty slow on finishing projects.

    I am curious to hear what kind of belts folks are using. Ive bought a couple off ebay for the 1500fd and none have worked. The drive spins but not freely enough. A bit of lube hasnt done the trick. I think I went too small on the belts though. Not my area of expertise so I would appreciate any advice.

  8. #8
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    Quote Originally Posted by hancat View Post
    Apologies for resurrecting a thread here...
    I just picked a 1100FD to add to my project pile along with a Tandy 1500HD.

    The battery on the 1100FD is easy to do with some 18650s, a 2s BMS and a small buck converter. Should work off the built in charger, too.
    The SLA discharge curve on a 6v battery ranges from 6 to 6.4v though while charging can be as high as 7.2v so it doesn't need to be an exact science. Ill be happy to post results if anyone is interested though I am generally pretty slow on finishing projects.

    I am curious to hear what kind of belts folks are using. Ive bought a couple off ebay for the 1500fd and none have worked. The drive spins but not freely enough. A bit of lube hasnt done the trick. I think I went too small on the belts though. Not my area of expertise so I would appreciate any advice.
    Same issue with the belts. I finally found what I think is technically an O-ring but it works perfectly. It is a dead ebay listing, but the description was "New Floppy Drive Belt- Korg, Yamaha, Matsushita EME-213,216"

    I have not had any luck replacing the battery with a direct DC input, it completes the self test but immediately reboots at any voltage from 6 to 7.5.

  9. #9

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    I recently got my Tandy 1100FDs working.

    The big problem I found with the floppy drives is that the old belt often melted to the pulleys. You must clean the old belt residue off (I used alcohol and lots of Q-Tips) or when you put the new belt on, the timing will be off because the old belt residue on the pulleys will increase the circumference of the pulleys - but not evenly (the belt only melted to part of the pulleys).

    Once I cleaned the residue off, replacing the belt made the drives work just fine.

  10. #10

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    But I did notice a rather high failure rate in DS/DD floppies as I was playing with my 1100FD. The floppys were formatted out of the box and most of them were just fine. But on about 5 out of 20, I got read errors and when I reformatted them in the 1100FD, they had bad areas.

    Doing some searches for "matsushita EME-213AMC" (the model number on the 1100FD floppy drive), was able to locate this: https://www.floppyemulator.com/produ...ushita-eme213/.

    Supposedly, this will provide an interface that will let me use a GOTEK drive in my 1100FD.

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