Cromemco DOS

Cromemco DOS, also called CDOS for Cromemco Disk Operating System, is a CP/M-like operating system written by Cromemco for its own microcomputer systems. It lets users create and manipulate disk files using symbolic names. CDOS was written in Zilog Z80 machine code. Because so many programs were then available for Digital Research CP/M, it was designed to be upwards compatible with that system: many programs written for CP/M versions up to and including 1.33 run without modification under CDOS, while programs written for CDOS generally do not run under CP/M. The Cromemco Z-2 could run it, as could the System One, which could also run CP/M 2.2 and Cromix, and the C-10 personal computer introduced in 1982 also ran CDOS. An emulator for a Cromemco CDOS system exists.