OK. So, I have gottem this far:
I have a Samsung SFD-321B floppy. Took the standard PC floppy cable, straight bit and cut wires 10 and 12. Wire 10 going from the BB connects to wire 12 on the floppy (as it is permanently wired as unit 1). Floppy works.
Using ImageDisk 1.18, I can now format a Non-HD 3.5" floppy and read sectors on it. I can use it to write down a KayPro image (kayIIger) and read it using the monitor command R0,1,1 for example. But when I try writing any of the BBII images, ImageDisk barfs and errors out.
The KayPro image seems to be 250k 10 sectors of 512 bytes. DDBoot.s1 for example appears to be 500k 26 sectors of 128 bytes.
What am I doing wrong?