Nat,
I am relying on Pina here and not my own experience.
In his Dead Mac Scrolls (p. 249), Pina lists one problem that sounds like your original problem ["Even when there is no disk in the drive, it spins and makes continuous eject noises."] The solution is to switch cables--the problem in the book is that a yellow-striped cable drive is using a red-striped cable, so the problem is fixed by switching to a yellow-striped cable (the red-striped cable can also be adapted to act like a yellow-striped cable by disconnecting the wires on pins 9 and 20).
Maybe by adding that little circuit board (an adapter?), you solved a cable problem? But according to Macintosh Repair & Upgrade Secrets (see pp. 193-194), older 800K drives require the yellow-striped cable, while newer 800K drives require the red-striped cable. Maybe the adapter is designed to connect the wires at pins 9 and 20, creating the equivalent of a red-striped cable, or vice-versa?
I guess maybe it is moot since you made it to the Happy Mac, and maybe now it's a software problem, like Eagle says. Or maybe not. I don't know.
What System file version do you have on those 400K disks?
Eric
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