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ymk

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  1. Interleaving the signal lines with grounds reduces crosstalk. ATA/66 accomplished this without giving every ground wire in the cable its own pin on the board.
  2. Hi Dmitry. We've been in contact on Ebay. Like I mentioned, I don't have an 8500 to test with, but I've ordered a 7500 which also has the fast internal bus. Since you've confirmed MacSD works with the 8500's external bus, I still recommend using that for now. I will message you when I know more about the issue.
  3. Have you tried the MacSD as the only device with the resistors in the pull-down configuration?
  4. Signal reflections. The devices should be laid out in a line: End of 50-pin cable -------- middle of 50-pin cable -------- SCSI controller on logic board -------- DB25 external connector ------- external device 1 ------- external device 2... Branches (as in a USB hub) should be avoided. Adapt the DB25 to a 50-pin header, like the logic board uses. Then you can connect both external devices using a 3-connector 50-conductor cable and terminate the one on the end.
  5. SCSI devices are wired in parallel, but the physical layout matters. Wiring devices in a star or T layout is asking for problems.
  6. There is currently no Powerbook version of MacSD. Transfer rates are typically 1.4-2.3 MB/s on a PowerMac 6100, depending on clock speed and card. I'd expect the lower end of that range on a PB180.
  7. I've recapped many Classics and Classic IIs. The Classic especially, has many traces running underneath caps and with time, they will be eaten through. An ounce of prevention is worth a pound of cure here. I'm not asking you to send them to me, but don't run vintage hardware into the ground.
  8. Your monitor might have an "Auto" function to adjust to the signal timing.
  9. Some more options: Reset the PRAM Boot with the mouse button held down Use SCSI IDs 0 and 1
  10. For now, try swapping the HDD and CDROM SCSI IDs. Edit: If you haven't yet tried booting with the CDROM at 4 and the HDD at 0, do that first.
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