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  1. What, you can't read binary from toggle switches...

    What, you can't read binary from toggle switches as easily as you read LEDs? You need more practice. :)
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    As opposed to say, "Flying Pigeon"?

    As opposed to say, "Flying Pigeon"?
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    Yup, MS sold MSDOS to various OEMs for...

    Yup, MS sold MSDOS to various OEMs for distribution.
  4. On what machine? And what radix?

    On what machine? And what radix?
  5. Why not retrofit it with a modern nATX board,...

    Why not retrofit it with a modern nATX board, power supply and LCD monitor? You should have more than enough room to do it.
  6. That's just my point. Stick an AM radio next to...

    That's just my point. Stick an AM radio next to your CPU and listen to the noise. Have the computer actuate a solenoid to fire off fireworks. LEDs are not a requirement.
  7. I retrofitted an ASUS Athlon XP board with an...

    I retrofitted an ASUS Athlon XP board with an XP-M to get the unlocked multiplier. It's not too hard--just a couple of wiring alternations. It works well.
  8. Not just looks--you'll actually get a bit of...

    Not just looks--you'll actually get a bit of corrosion resistance.

    The stuff I linked to give a matte gray finish; perhaps you want a brighter finish? try this
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    I suspect an industrial controller/network card. ...

    I suspect an industrial controller/network card. Likely to be of no use unless you find drivers specific to it.
  10. I'd liken LEDs more as an output device--i.e. a...

    I'd liken LEDs more as an output device--i.e. a tachometer on a car. You don't really need one.
  11. You're more patient than I would have been. The...

    You're more patient than I would have been. The rust has eaten off the zinc plating on the parts, so you might as well take wire wheel to the rusty areas and get rid of the corrosion altogether,...
  12. Try reading or writing a bunch of disks using...

    Try reading or writing a bunch of disks using IMD (use the disk-to-file and file-to-disk function) If there's a hardware problem, it should show up.

    On the off-chance, you don't have any other...
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    That large NEC chip is an 8085 CPU. This isn't...

    That large NEC chip is an 8085 CPU. This isn't a simple comms card.
  14. Sure, but before I ever did that, I punched my...

    Sure, but before I ever did that, I punched my machine code into cards or entered it on the console typewriter. On the CDC 6000, the bootstrap was entered by means of a toggle switch matrix, but no...
  15. I'm sorry; I must be dense. I don't follow. ...

    I'm sorry; I must be dense. I don't follow. You need an input device of some sort and you need an output device of some sort. What does machine code or assembly or LEDs have to do with it? You...
  16. Well, that's one reason that the 765 features a...

    Well, that's one reason that the 765 features a software reset line. :)

    But if you look at the MSDOS code, "General Failure" can come from a variety of places. For example, if the layout of the...
  17. Howso? I've programmed bare iron in machine...

    Howso? I've programmed bare iron in machine language with no LEDs. Of course, you need some sort of I/O to satisfy the basic function of a computer.
  18. I read the thread title for what it was. eeguru...

    I read the thread title for what it was. eeguru could just as well have devised an LED peripheral for an S100 system that displayed address and data lines, even if there wasn't already one. Do...
  19. Unfortunately, "General Failure" is a catchall...

    Unfortunately, "General Failure" is a catchall for several problems. It could be a controller failure or simply a bad boot sector.

    Try using a better diagnostic.
  20. Actually, a bandpass filter.

    Actually, a bandpass filter.
  21. My recollection is that those have "shoulder" on...

    My recollection is that those have "shoulder" on the screw shank.
  22. HP also used this type of screw a lot just search...

    HP also used this type of screw a lot just search on "HP screws" and have fun.

    Here are some that are a bit longer: here

    Don't know about those sleds, though.
  23. Note also, that the underside of the head of the...

    Note also, that the underside of the head of the cheese-head screws are serrated--no lockwashers needed.

    In the 70s, the Torx screwdrivers from Textron were long (12") hex-shafted affairs with a...
  24. Yup. I believe that the Deluxe option board...

    Yup. I believe that the Deluxe option board documents discuss which drives work and which have problems. You'd think that any 2D drive could handle them, but it's not so.
  25. Sorry, I was out doing battle with some...

    Sorry, I was out doing battle with some yellowjackets--I lost. :(

    At any rate, This link

    https://i.ebayimg.com/images/g/wfgAAOSwNsdXSils/s-l1600.jpg
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