On 1/31/21 12:35 PM, Warner Losh via cctalk wrote:
  Greetings
 I recently purchased a QCS external hard disk on ebay. This was one of the
 companies that was selling DEC Rainbow hard drives. I had hoped it was an
 old Rainbow drive with interesting to me bits... Turns out it is an Epson
 QX-10 hard drive, full of interesting to bits for the QX-10 CP/M
 enthusiast. I've had trouble finding a suitable community to note this in
 should there be people around that care... so I thought I'd ask here is
 people know of good CP/M groups and/or QX-10/16 groups, mailing lists, irc
 channels, discord servers, etc I could find. 
I'm not aware of anything, unfortunately. I've got a QX-10 that was
originally one of Epson's sales demo machines, and got taken around to
prospective customers by one of their sales reps - which does mean that it
was well looked after and came with a *lot* of documentation (and media,
but nothing "exciting" beyond the usual OS, Valdocs etc.).
Did you happen to take an image of the drive contents?
(hanging a hard disk off mine would be fun, but I think they were SASI to
the external enclosure, and there was a SASI interface which plugged into
the expansion slots - I'm not sure if the latter is documented anywhere)
cheers
Jules