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NitrOS-9 is a real-time, process-based, multitasking, multi-user, Unix-like operating system for the TRS-80 Color Computer, Radio Shack Color Computer 2, Tandy Color Computer 3 and Dragon 64.

The original OS-9 was created in 1979. NitrOS-9 is the modern equivalent of that OS, and includes advanced features like support for up to 2 MB RAM and 4 GB Hard drive partitions.

It is still being developed, and support is available in many mailing lists and forums.

From an old OS-9 manual:
UNIX:
An operating system similar to OS-9, but with less functionality and special features designed to soak up excess memory, disk space and CPU time on large, expensive computers.

NitrOS-9 News

February 8, 2008

A NitrOS-9 command guide is being created in the CoCo Wiki.
Please stop by and contribute.

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April 21, 2006

NitrOS-9 Version 3.02.06 is released.

• Support for booting from fragmented bootfiles has been added.
• os9gen has been updated to allow the creation of fragmented bootfiles.
• dir and mdir now have more robust support for various screen widths when displaying data.
• dir and attr now use the SS.FDInf getstat call to obtain a file's FD sector.
• dsave now has -t and -n options.
• A bug in format which affected 128MB partitions has been fixed.
• /D2 descriptor now part of standard bootfile.

Go get it now!

Coming soon: News archive.