There were lots of minicomputer makers. For example,
I've seen no
discussion on Varian minis and darned little on TI 990s or CDC 1700s, as a
start.
Of course, you will need to find maintenance documents, programs, etc.
1700s are quite rare, but there is a good pile of docs and software
available. Disks tend to be pretty common, as they were used with
other systems.
--
Will