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  1. It's definitely a possibility. Of course, the...

    It's definitely a possibility. Of course, the only way to determine this is to locate a replacement belt. Unfortunately, the old flat rubberized fabric belts are pretty hard to come by these...
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    Remove the cookie from the jacket, rinse with...

    Remove the cookie from the jacket, rinse with distilled water, put in new clean jacket.
  3. I'll venture that the missing crystal is 8MHz. ...

    I'll venture that the missing crystal is 8MHz. But if there's an issue with the PALs on the board, you might as well continue the scavenging operation.
  4. I don't think it has anything to do with the hub...

    I don't think it has anything to do with the hub cone/clamp assembly.

    Here's another post that describes a problem similar to yours

    I suppose you could disassemble the spindle assembly and...
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    Sprechen sie Google? A quick search brings up...

    Sprechen sie Google? A quick search brings up this post.

    Search terms: "site:vcfed.org eraser microwave"
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    See my post on a DIY bulk eraser using magnets...

    See my post on a DIY bulk eraser using magnets from an old microwave oven magnetron.

    https://i.imgur.com/MUKTExa.jpg
  7. ...not to mention that some stack-based CPUs put...

    ...not to mention that some stack-based CPUs put the top-most levels of the stack in register memory. I believe that some members of the Burroughs mainframe line did this. I don't know what the...
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    Stuck in a POST card backwards. System worked...

    Stuck in a POST card backwards. System worked before; not after (toasted a custom QFP)
  9. I still get emails from DAK, but it's run by a...

    I still get emails from DAK, but it's run by a fellow named Sol now. Mostly portable audio (e.g. Bluetooth) stuff--nothing really interesting and certainly nothing like the old DAK.

    You could...
  10. I looked at the one that I have with punch-outs. ...

    I looked at the one that I have with punch-outs. The LPT DB25 hole is already punched out.

    I've got a couple of ones from HP where the unneeded (but present) holes are simply covered over with a...
  11. Or write it as an FPGA implementation. Doubtless...

    Or write it as an FPGA implementation. Doubtless it will run faster than the original.

    Stack machines were popular for a time as the target for microcomputer compilers. Interpreted execution. ...
  12. Probably 1600 PE; 6250 was a bit more common...

    Probably 1600 PE; 6250 was a bit more common later. As to data format, that was mostly under program control.

    That's the wonderful thing about tapes--other than (optional on some systems)...
  13. You're expecting newly-manufactured tapes today? ...

    You're expecting newly-manufactured tapes today? Offhand, I'd say that the market is very small.



    You use a tape cleaner/certifier machine. Mine is equipped with a tungsten carbide blade that...
  14. Or put a repeater on the second floor, if...

    Or put a repeater on the second floor, if possible.

    What practical speed is his service? Could be that a simple USB Wifi dongle would work.
  15. Any 900 MHz/100FSB ones?

    Any 900 MHz/100FSB ones?
  16. In fact, a primitive virtual memory scheme was...

    In fact, a primitive virtual memory scheme was implemented by several products under CP/M, but almost always within some sort of framework. For example, JRT Pascal allows for very large programs...
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    I've got the software discs that came with my...

    I've got the software discs that came with my dual 90MB box, if that's any help. Don't know what version they are.
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    Tags like 2D5 or 4C5 are a coordinate system. ...

    Tags like 2D5 or 4C5 are a coordinate system. So 4D3 means page 4, row D, column 3--and then you start looking for a matching tag.

    In your case page 4, coordinate C5 label VSYNC would be the...
  19. Not to put too fine a point on this, but have...

    Not to put too fine a point on this, but have your copies been hacked to defeat copy-protection?
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    Color me dense, but where might I find the...

    Color me dense, but where might I find the schematic for the whole board, not just little snippets?
  21. My experience is with MP/M, which enjoys(?) a...

    My experience is with MP/M, which enjoys(?) a similar banking scheme. However, the hardware that I used allowed mapping the 64K of the address space to anyplace in the 256K of physical memory in 1K...
  22. My null modem jumper boxes all have 6-8-20...

    My null modem jumper boxes all have 6-8-20 connected on the DB25 connectors on both sides. (DCD-DTR-DSR)
  23. Are you certain about the cold re-boot? Do you...

    Are you certain about the cold re-boot? Do you have a program that directly reads the registers of the RTC? There should be a few programs on SIMTEL20 to manipulate and examine the RTC registers. ...
  24. It sounds as if the SRAM is keeping its content,...

    It sounds as if the SRAM is keeping its content, which is to be expected, but could it be that the oscillator isn't running to make the clock "tick"? Does the clock advance between power cycles?
    ...
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    There's a video of Dave (eevblog) trouble...

    There's a video of Dave (eevblog) trouble shooting a PCJr keyboard. It might lend a bit of insight into what goes in to trouble-shooting vintage gear:

    here
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