TRIPOS was developed in 1976-1979, with the 68000 port finished in 1981. Only the Amiga's disk operating system and command-line shell were from TRIPOS. The un

TRIPOS was developed in 1976-1979, with the 68000 port finished in 1981. Only the Amiga's disk operating system and command-line shell were from TRIPOS. The underlying "Exec" (microkernel) had been developed at Commodore-Amiga: It was close enough to similar facilities in TRIPOS that it made porting relatively simple. Commodore-Amiga had originally hired another company to write the DOS, called "CAOS" (Commodore Amiga Operating System), originally intended to have been even more similar to Unix than TRIPOS was. But that company had failed to deliver, and the release date was fast approaching, so the choice of TRIPOS was an emergency solution.