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  1. 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.
  2. Actually, a bandpass filter.

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

    My recollection is that those have "shoulder" on the screw shank.
  4. 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.
  5. 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...
  6. 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.
  7. 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
  8. So they're cheese head Torx, right? these look...

    So they're cheese head Torx, right?

    these look like them?
  9. Dunno--exactly what size do you need? I'll try...

    Dunno--exactly what size do you need? I'll try my own google-fu to see if I can help out. I saw that there were some that were offered at the end of June.
  10. Search on eBay for "Compaq Screws". There are...

    Search on eBay for "Compaq Screws". There are several sellers of the Torx+Slot screws.

    We used Torx-head screws in the 1970s. You had to buy the tools from Textron--and they were expensive, but...
  11. No, the "green sleds" that I was talking about...

    No, the "green sleds" that I was talking about were permanently installed. You just installed the cheese-head Torx screws right into the drive body and the screwheads would slide in the slots in the...
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    The "QIC-02" interface is pretty simple;...

    The "QIC-02" interface is pretty simple; basically address decoding and DMA and IRQ servicing.

    Here;s a similar unit from Everex

    Though I suspect that the Everex unit is a QIC-36 interface...
  13. Were these the ones used for drive mounting? ...

    Were these the ones used for drive mounting? That is, you screwed them into the disk/floppy/CD drive and then slid the unit into a plastic chassis-mounted retainer (usually green).

    I've never...
  14. Here's a thought: does the 5154 use a nonpolar...

    Here's a thought: does the 5154 use a nonpolar cap in its PSU (like most SMPSUs do)? Did you replace it with a similar nonpolar unit?
  15. Caps can fail without spilling their guts. ...

    Caps can fail without spilling their guts. Sometimes, it's just a dead short.

    There have been instances where board markings are wrong, but I don't know about the 5154.
  16. By the time the Micral C came around, the no-LED...

    By the time the Micral C came around, the no-LED systems were getting pretty common. Heck, the Apple didn't have them.

    The N of course, did.
  17. Perhaps some caps were replaced "backwards"? ...

    Perhaps some caps were replaced "backwards"? (Don't always trust board markings!)
  18. French machine?

    French machine?
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    Have you tried a

    Have you tried a <2GB CF card?

    Just thinking aloud here.
  20. But then, everyone knows that Steve Jobs invented...

    But then, everyone knows that Steve Jobs invented the microcomputer--just like Nikola Tesla invented alternating current.... :)
  21. Surely, the MCM/70 had to precede all of those...

    Surely, the MCM/70 had to precede all of those other LED-less micros:
    ...
  22. I went from an MITS 8800 to a LED-less Integrand...

    I went from an MITS 8800 to a LED-less Integrand chassis. Didn't make any difference in utility.

    Blinkenlights were out of fashion in the 70s. Consider, for example, the CDC 6600 (1964):
    ...
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    If it's acrylic, solvent cement makes for...

    If it's acrylic, solvent cement makes for invisible joints. So screw bosses are no issue. You can see some evidence of this sort of thing in the gussets near the top.
  24. As an aside there are instructions for...

    As an aside there are instructions for de-yellowing using chlorine bleach as well.
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    Oh well, it was an interesting exercise... :)

    Oh well, it was an interesting exercise... :)
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