pioneering computer operating system: crossword clues

Matching Answer
Confidence
UNIX
60%
MSDOS
60%
ICON
60%
DOS
60%
ATARI
60%
ENIAC
60%
ALAN
60%
MYST
60%
TRON
60%
LAN
60%
e.g. Greek Cheese
e.g. O?D (Use ? for unknown letters)