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  1. Incredible job!

    Incredible job!
  2. You mention, "went to roll my chair..." Did you...

    You mention, "went to roll my chair..." Did you end up pulling off a probe that shorted against something and "poof something sparked," or without being disturbed, did something go poof? If the...
  3. It looks like the motor on/off mod and the ready...

    It looks like the motor on/off mod and the ready mod are both implemented, so that's not the problem. Let me know what happens when you try the other disk images.

    Mike
  4. The mods are documented toward the end of the...

    The mods are documented toward the end of the floppy controller manual here: https://deramp.com/downloads/vector_graphic/hardware/Floppy%20Controller.pdf

    Mike
  5. Well damn, yep, that’s correct. Post pictures of...

    Well damn, yep, that’s correct. Post pictures of the Micropolis controller board mods. If the motor mod is done (that one stops the motor about four seconds after the drive is deselected), but the...
  6. See what the boot ROM checksum is. Type "Q F800...

    See what the boot ROM checksum is. Type "Q F800 F8FF"

    Mike
  7. The flicker is the full rotation index pulse at...

    The flicker is the full rotation index pulse at 1/2 the sector time that you have to ignore. Looks to me like that drive is about 5.2 divisions or 10.4ms. That’s way too quick, nominal is 12.5ms (300...
  8. I’ve used an EP-1 programmer for years - ever...

    I’ve used an EP-1 programmer for years - ever since I purchased it new way back when. It’s been a great and reliable programmer for 35 years.

    XMODEM is not an option in my firmware version, so...
  9. We can rough check timing with a scope. Measure...

    We can rough check timing with a scope. Measure sector to sector time by monitoring test point 3, negative edge triggered. Note you’ll have a half-sector time slip in periodically at the index pulse....
  10. You can pick out the pattern even with an...

    You can pick out the pattern even with an incandescent bulb. Not as obvious as fluorescent, but it’s there.

    Mike
  11. The manual you posted has the connector...

    The manual you posted has the connector information so you can know for sure in future.

    If PCFLOP was able to write and verify the disk, then it should boot unless you have RAM problems. Use the...
  12. Look on the hub pulley. Is there a strobe pattern...

    Look on the hub pulley. Is there a strobe pattern printed on a white disk? Just watch in a room with (ideally) fluorescent lights. It should appear to stand still while the motor spins. Most likely...
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    Lots of good work already. Fun! Mike

    Lots of good work already. Fun!

    Mike
  14. Actually, before we look for a write issue, have...

    Actually, before we look for a write issue, have you looked at the 60hz strobe lines on the hub disc? How is the drive speed?

    Mike
  15. I would normally start looking on the drive PCB...

    I would normally start looking on the drive PCB first, but your drive cabinet has a single board that controls two drives instead of a board per drive. I only have schematics for the latter. Have you...
  16. Read problems are more common than write problems...

    Read problems are more common than write problems because reading is a much more complex process than writing. Thatís why we checked reads first. Of course, you could just have a write problem, and...
  17. With the adjustments made, is the behavior with...

    With the adjustments made, is the behavior with PC2FLOP the same on both drives?

    Mike
  18. I'm sure these are discussed somewhere in the...

    I'm sure these are discussed somewhere in the thread, but let's double check the following:

    1) You're using hard sector disks with 16 hard sectors (not 10, not soft-sectored)
    2) The write protect...
  19. Looks like the pin number is wrong in that...

    Looks like the pin number is wrong in that version of the manual. Look at pin 13, not 3.

    Mike
  20. From what I recall, you can get the measurements...

    From what I recall, you can get the measurements while it’s stuck in the loop trying to boot.

    Mike
  21. If you’re to the point that PC2FLOP is writing...

    If you’re to the point that PC2FLOP is writing and verifying, then it is failing on the read. It’s time to calibrate the pots on the FDC. It’s pretty easy to do. Look at the “Tests and Adjustments”...
  22. Looking really good!

    Looking really good!
  23. The track 0 switches goes through a couple of...

    The track 0 switches goes through a couple of connectors and gates before driving the cable connector. You can find schematics towards the end of this manual:...
  24. Great progress! Use a scope and see if the track...

    Great progress! Use a scope and see if the track 0 signal on the interface cable (pin 26) is getting asserted (asserted = low). Look at the signal on the drive PCB and then on the floppy controller...
  25. Do your drives start spinning only when they’re...

    Do your drives start spinning only when they’re selected and then stop after 4-5 seconds, or do they run all the time like an 8” drive? When the drive is selected by PC2Flop, do you hear the head...
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