Re:The earliest OS I know of is Unix. (Score 1)

some OS for IBM 360 predate UNIX. They were MFT (Multiple fixed tasks) very old MVT (Multiple variable tasks) old SVS (Single Virtual Store) recent MVS (Multiple Virtual Storage) current Of course the 1403 autocoder predates that, and EAM (Electronic Accounting Machines which were programmed by interchangable plug boards) predate the 1403.