BeOS

BeOS is a discontinued operating system, first developed by Be Inc. in 1991. It was developed to run on the PowerPC-based BeBox hardware, and ported to x86 for version 3. It was designed for multimedia applications. BeOS is POSIX-compatible but not UNIX-derived. After your discontinuation, the community is making a new operating system named Haiku, using BeOS concepts.

For emulators like 86Box, all images must be in .bin/.cue format due to its unusual disc layout, or else it will not get past the first boot screen.