The Positron 9000 is a British made computer from 1982 and there is maybe one in existence at https://binarydinosaurs.co.uk/.
This is a Level II system using 2 KB RAM 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.
- Disassembled modules
- OS-9 Level 2 V1.2 kernal, part 1 (os9p1)
- The OS-9 kernel from Positron 9000