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  1. Sometimes you can figure basic functionality by...

    Sometimes you can figure basic functionality by disconnecting the signal cable and grounding the various pins. For example, when a disk is inserted and the corresponding drive select is grounded,...
  2. Depends on the number of wires. TM-100s were...

    Depends on the number of wires. TM-100s were made with both 4 and 6-wire steppers. I could see a 6-wire stepper only working in one direction, but they weren't the most common variety in TM-100s.
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    Wang used IBM Model Ms with rebadging. Got rid...

    Wang used IBM Model Ms with rebadging. Got rid of one (traded) several years ago. The only thing different was the part number and little badge on the upper left side of the keyboard. Instead of...
  4. Yes, I was referring to Al's use of "eztape".

    Yes, I was referring to Al's use of "eztape".
  5. Is EZtape what Everex used? Didn't Irwin also...

    Is EZtape what Everex used? Didn't Irwin also use that? Or am I hallucinating again? :)
  6. There were several versions of the Prolinea...

    There were several versions of the Prolinea 486/66 motherboard. Some used an NiCd Varta battery (just behind the keyboard connector), others used coin cells.

    Regardless, you want to remove any...
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    I can't say that for certain. The head assembly...

    I can't say that for certain. The head assembly is a complex system. The only way to have an inkling is to use something like IMD and check each head individually.
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    Nothing on the PCB. It's purely a relative...

    Nothing on the PCB. It's purely a relative positioning issue.
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    No, you need to look to the alignment, now. ...

    No, you need to look to the alignment, now. (Format, write, read) on the same drive means that the drive is operating more-or-less correctly. Not being able to swap disks between drives means...
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    Well, I'd suspect the trimmers (which are usually...

    Well, I'd suspect the trimmers (which are usually factory-set; that's why they often have a blob of glypt holding them in place.) if you couldn't format a floppy and write to it successfully. ...
  11. A logic probe should nail things down pretty...

    A logic probe should nail things down pretty quickly.
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    Yes and no. DB19 ACSI connectors and hoods are...

    Yes and no. DB19 ACSI connectors and hoods are not easy to find, even today. DIN14M floppy connectors aren't any easier to find new.
  13. My first gut feeling is not the stepper, but the...

    My first gut feeling is not the stepper, but the driving circuitry. You can't step with just one set of coils operating--the shaft will not move at all.

    A good tutorial on steppers

    I believe...
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    They were somewhat uncommon in 1986, along with...

    They were somewhat uncommon in 1986, along with the floppy and ACSI connectors.
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    There are thin VGA cables--I'm looking at one...

    There are thin VGA cables--I'm looking at one now. I have no idea how common 13 pin DINs are nowadays. When I had a 520ST, I made my own with perfboard, pins and epoxy potting compound.
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    My point was that a cheap VGA cable is probably...

    My point was that a cheap VGA cable is probably best suited to the job. Very often, the RGB leads are mini-coax in addition to the entire cable having at least a foil shield. The bandwidth...
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    Why not just use a cheap VGA cable and lop the...

    Why not just use a cheap VGA cable and lop the ends off?
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    How practical is powder coating in this case?

    How practical is powder coating in this case?
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    I've long had a soft spot for AMD--writing this...

    I've long had a soft spot for AMD--writing this on an AMD rig right now.
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    You want code to save the filename elsewhere (not...

    You want code to save the filename elsewhere (not 80h?). If so, how about this chestnut that I wrote back in the 1980s for a .exe file (cs ≠ ds):



    ; On entry, DS->PSP segment.
    ve: ...
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    Well, that's how the interlink/intersvr thing...

    Well, that's how the interlink/intersvr thing works--and it does work on a PC XT--and it's free. See post #6.
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    See post #4. Of course, he'll need a cable, but...

    See post #4. Of course, he'll need a cable, but I still have a number of those.
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    Sure, if it's convenient. On the Unix-style DOS...

    Sure, if it's convenient. On the Unix-style DOS I/O, PSP+80h has no particular use other than passing the command arguments.
    After MS stated that it was going to drop FCB support, I recoded 22Nice...
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    If you're using to parsing CP/M 2.2 command...

    If you're using to parsing CP/M 2.2 command lines, MSDOS/Windows works the same way. Everything after the command is stored in PSP+81h, terminated by a 0dh; 80h is the byte count. DOS never forgot...
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    It's not a good test. Printers either have...

    It's not a good test. Printers either have buffering or are slow enough that it doesn't matter. I recall background printing utilities for WordStar that used neither interrupts per se nor DMA. ...
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