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