I came into posession of an Apple IIe with a DuoDisk unit. It sat for years in a barn and is caked with mud dauber nests on the inside. As I'm cleaning it out, I've torn down one of the two DuoDisk drives and I want to establsih two things:
1. Whether or not I need to do the DuoDisk mod to the analog board
2. How to test the stepper motor before putting everything back together.
On the first point, I can't establish whether or not the analog board is one of the three that require the mod for preventing disk overwrites. That is, there is no 676-101, 676-102, or 676-107 marking. On the back, I see 820-0123, but as I look at schematics, I get the impression that's not the number I'm really looking for... But I see no other numbers on the PCB like that.
On the second point, I've found descriptions of the 20-pin connector, but they are for Disk II or DuoDisks that appear to be different than mine. The article on Wikipedia describes wire colors which I really couldn't correlate to the connector I have.
Any tips or a cache of technical documents I've not yet found?