robmck wrote:

What software do you use on the PC? If I remember right, PC drives are constant linear velocity and Kaypro drives are constant radial velocity (or the other way around), so you'd need to get the PC drive to work differently. I've got a 5.25" in a box somewhere, but I'm not sure what state it is in.

Once upon a time, I dreamed of using an Arduino or Raspberry PI to build an emulation of the Kaypro 10 hard disk controller to plug into my 2X (which has the port, but no controller), then build a little hard-drive library manager on the RPI so I could keep all files on there. (Would have to remember how to get ZCPR onto it...) Come to think of it, I think I have a pile of Micro Cornucopia magazines in another box if I can find it...

So many projects, so little time...

There are several PC programs - 22disk, anadisk, and teledisk.  All are DOS-based.    The Kaypro drives are no different than PC drives, physically - standard MFM.  Different formatting, obviously.  In fact, there's a CP/M program on the Kaypro to read/write PC floppies directly.  I can't remember the name off the top of my head, but I have a copy.

You can get Teledisk at the bottom of this page:

https://oldos.org/downloads/msdos/

And images of all the known Kaypro boot disks and other programs here:

http://www.retroarchive.org/maslin/disks/kaypro/index.html