FWIW:
With interest in the Programmer's Aid,
I thought I had an Apple ][ RedBook,
so I went searching for it, hoping to find
info on the Aid ROM. Not found yet.
But I did run acrossan OEM MANUAL for SA400 MiniFloppy
Diskette Storage Drive. By Shugart Associates (40 pages), Sep. 1978.
I could fax some pages if anyone likes.
It has some timeing charts, schematics,
sections on recording format, electrical interface.
SEEK:
I'm also still searching for the manual
Apple ][ Ieee-488 Interface User's Guide.
Keven Miller
kevenm(a)reeltapetransfer.com