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  1. The three-key salute (ctrl-alt-del) is trapped...

    The three-key salute (ctrl-alt-del) is trapped within the BIOS and initiates a reboot--doesn't indicate anything about the MSDOS functionality.

    It sounds as if the system is hung in a loop or has...
  2. May have nothing at all to do with the...

    May have nothing at all to do with the keyboard--both DOS versions use the INT 16H BIOS service for keyboard input.
  3. I suspect your jug is in the early stages of "CRT...

    I suspect your jug is in the early stages of "CRT Cataract"
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    If you search for MSDS on dot matrix printer...

    If you search for MSDS on dot matrix printer ribbons, the majority ingredient appears to be oleic acid (a monounsaturated fat; think olive oil) and some mineral oil applied as a spray--and of course,...
  5. At this point, we'll never know for certain.

    At this point, we'll never know for certain.
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    Mineral oil, mostly. The rest is foil and paper....

    Mineral oil, mostly. The rest is foil and paper. The encapsulation is resin.

    Nothing you haven't seen before and mostly harmless.
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    Both look like (mostly) horizontal sync issues. ...

    Both look like (mostly) horizontal sync issues. Any idea of what the specified horizontal sync frequency is? Can you measure it? How is the sync transmitted to the monitor (e.g. SOG)?
  8. Also, check the drive select jumpers on the B:...

    Also, check the drive select jumpers on the B: drive. All drives, assuming a "twisted" cable should be set to the second drive select.

    If the drive was brought over from a non-PC (e.g. CP/M...
  9. I'd happily pay $5 for a non-working Cray I.

    I'd happily pay $5 for a non-working Cray I.
  10. CHM in Mountain View has some Youtube clips on...

    CHM in Mountain View has some Youtube clips on their restored 1401. You can see how involved the 727/729 is, mechanically. IBM had a penchant for doing things mechanically if they could.

    The...
  11. Well, carbon composite power resistors have a...

    Well, carbon composite power resistors have a peculiar failure mode--and this may be evidence of one.

    As a composition resistor ages, even if it's not used, the resistance rises. Said resistance...
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    If you use an emulator, you can even use a stock...

    If you use an emulator, you can even use a stock MOVCPM (with the serial number check patched out) to create the correctly-sized BODS+CCP.
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    I think black stamp pad ink is mostly glycerine,...

    I think black stamp pad ink is mostly glycerine, ethylene glycol and carbon black.

    I believe that dot-matix cloth printer ribbons also have a bit of lubricant in them for the printhead.
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    The sector translation tables arose in CP/M...

    The sector translation tables arose in CP/M because 3740 diskettes were purchased pre-formatted, so there was no option to format them. This even extended into some of the DEC formats--I don't...
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    ...and those constructed in a wavy sort of way: ...

    ...and those constructed in a wavy sort of way:

    https://www.movies4kids.co.uk/wp-content/uploads/2017/05/l_1296313124-347.jpg

    We mustn't forget the 5,000 fingers...
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    What I don't understand is why a stock...

    What I don't understand is why a stock precompiled CP/M BDOS/CCP isn't being used. I really don't want to check that code for correctness line-by-line.
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    I saw that one, but first things first--why does...

    I saw that one, but first things first--why does he get the BDOS error on boot? I'd verify my suppositions by inserting some debug messages ahead of the read function to see what's actually being...
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    Well, I see two things immediately--I don't see...

    Well, I see two things immediately--I don't see any DPBs nor their corresponding DPHs, no CSV areas, etc. Do your sector addresses begin with 1 or 0?
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    Many years ago--it was somewhat of a...

    Many years ago--it was somewhat of a disappointment when I realized that much of the gear was for show only.

    Also many years ago (it seems that almost everything is that way now), the acquaintance...
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    I'm a little confused--the 3740 uses an 8" drive...

    I'm a little confused--the 3740 uses an 8" drive in single-density format. Are you trying to use a 5.25" high-density (1.2M) drive? Do you have the correct (HD) media?
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    Sounds like a good candidate for the House on the...

    Sounds like a good candidate for the House on the Rock. :)
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    There have been pianos and organs constructed...

    There have been pianos and organs constructed with keyboards in an arc (I think Dolge may have one in his book on pianos and Audsley probably for organs). They're harder to construct and don't enjoy...
  23. Fortunately, the circuitry between the timer...

    Fortunately, the circuitry between the timer (creates the beeps) and the speaker is pretty simple. See PDF page 316 (marked D-9) here.

    I've linked to the 16-64K first version of the 5150...
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    Well, given the wretched stock keyboards on most...

    Well, given the wretched stock keyboards on most laptops, this discussion is a bit silly, innit?
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    The needs of a musical keyboard are quite...

    The needs of a musical keyboard are quite different from a typewriter keyboard. For example, a piano keyboard must accommodate chording, as well wide spans. Indeed, a small hand can doom one who...
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