The machine had a ROM bootloader that allowed booting
from a 4051-like
cartrige magtape drive, or disk. Installing the OS took a LONG time
from cartridge tape.
The Tektronix 4081 was used to generate the vector
graphics for film of
the full-screen graphics used in the original "Battlestar Galactica" TV
show.
The 4052 I got from Jim Willing has a large collection of tapes which he
claimed contained BG graphics. I'll have to go through them to see if any
of them say anything about th 4081 on them.