I worked for a small rural telephone company who still operates a DMS100. One of my job duties as an on-call Unix system administrator was to perform a reel-to

I worked for a small rural telephone company who still operates a DMS100. One of my job duties as an on-call Unix system administrator was to perform a reel-to-reel tape backup on it. This DMS100 was installed in 1983 and the programs that operate on it must be much older than that. Still operates today.