ISIS (operating system)

It was originally developed by Ken Burgett and Jim Stein under the management of Steve Hanna and Terry Opdendyk for the Intel Microprocessor Development System with two 8" floppy drives, starting in 1975,[1][2][3][4][5] and later adopted as ISIS-II as the operating system for the PL/M compiler, assembler, link editor, and In-Circuit Emulator (developed by Steve Morse).

The ISIS operating system was developed on an early prototype of the MDS 800 computer, the same type of hardware that Gary Kildall used to develop CP/M.

Each device has a name, which is entered between a pair of colons (:F0: and :F1: are floppies, :LP: is printer, etc.).

ISIS-II has been distributed as part of the Intel Microprocessor Development System and includes standard operating system commands (COPY, DELETE, DIR, RENAME, FORMAT)[3] and debugging software (assembler, linker and debugger for external debugging in the developed device).

ISIS-PDS was also software and media incompatible and unique, it came on 720 KB double-sided double-density (DSDD) 5¼-inch floppies with the Intel personal development system (iPDS-100).