That's a real-time capable OS that is avaiable at no cost and is fully documented, including sources in PL/M-80 and assembler for the venerable 8080 CPU. Since all the sources are available, and since it's conceivable that one could translate the ASM code, preferably into 'C', this might give you just what you want, since you can then fiddle with it until it IS what you want. There's a freeware PL/M-51 compiler floating around the www and the CP/M sources and documents, along with a wealth of software, are mirrored on a number of sites.

You might want to look into that. If you were to implement a flash-based file system in place of the somewhat limited file system (BDOS) that CP/M uses, you might actually wind up with something useful. Goodness knows it's been thoroughly debugged and widely used for the first 10 or so of the past 35 years.

There are also several very adequate simulators that will allow you to run the CP/M software on a virtual machine on your PC. It's VERY capable, and its features are based on a productionoriented, rather than development-oriented OS (DEC's OS-8).

RE