Retrocomputing

Positron 9000

The Positron 9000 is a British made computer from 1982 and there is one in existence at https://binarydinosaurs.co.uk/.

This is a Level II system using the Motorola 6829 MMU and 2 KB pages. It has the entire kernel and several utility programs stored in 40 KB of ROM, and can therefore start up without a floppy disk.

Definitions file
Included from all assembly source files.
IOMan
The I/O manager from Positron 9000
OS-9 Level 2 V1.2 kernal, part 1
The OS-9 kernel from Positron 9000
OS-9 Level 2 V1.2 kernal, part 2
The OS-9 kernel from Positron 9000
Review in Personal Computer World magazine (1982-10)
Scanned and converted to HTML courtesy of Keith Robinson
System definitions
System type definitions