Thanks for the reminder to back it up.  It's great advise.  Th computer came with the original system floppies and an old school Ten Disk floppy box with floppies including the HyperDrive drivers and a backup of the drive.  To be sure I have it, I will back it up and see if I can make a boot disk with the HyperDrive driver on it.  A later rev of the HyperDrive installer looks like it's at the Mac Driver Museum at http://www.vintageapple.org/macdrivers/disk.shtml under GCC Technologies just in case as well.