Completed Keyboard adapter, with ZIFF connector for the ribbon cable.No luck with the USB to PS/2 adapters. I only tried a DELL keyboard.
I tested 5 different PS/2 keyboards and they all work just fine. (No issues with any of them).
(From left-to-right / Top-to-bottom)
Row 1. emachines, DELL
Row 2. DELL (by MicroSoft), Compaq "Internet"
Row 3. Compaq
Mike Willegal did a great job with this adapter, and I highly recommend this adapter to anyone working on an Apple-1. I promise you, you will need a backup someday.