There were a few 3rd parties that made hard drives for the
PCjr, both MFM and SCSI versions.
The SCSI ones are really interesting to me - there was a
Future Domain TMC850Jr controller that PC Enterprises sold
that attached on the side, and a card sold as part of an
upgrade package by RIM that went in the internal modem slot.
Unfortunately, I have neither - and I'd love to have one. I
imagine that the SCSI solutions can be faked into using a
SCSI Zip drive, which would be awesome ..
Jr heads ... here is my contribution to the web:
http://mail.magnaspeed.net/~mbbrutman/PCjr/pcjr.html
I have the tech ref, the service book, and other goodies. I
also wrote a cartridge & system ROM dumping program - might
be handy if anybody ever decides to start copying the old
cartridges. (Email me for source & .EXE)
Mike