I got a Varian(Univac) Data Machines 620L100 in very good conditions
including a fixed-head disk, a teletype and a Tektronix storage display.
This machines is dated to 1974.
--
Is it an ADAPTS system (is there an A/D panel just below the CPU) ?
I have one. It is very likely that there is a lab oriented BASIC
(possibly still in core!)
If there is any way to save the contents of memory before you fiddle
with trying programs, it would be a GOOD THING. I haven't touched
my machine because I don't want to destroy what may be the only copy
of that program.
I would also suggest not spinning up the disc right away.
I assume you aren't getting any documentation or external software
with it?