MOS010     - OS 0.10 for BBC Computer
MOS092     - OS 0.92 for BBC Computer
MOS100     - OS 1.00 for BBC Computer
MOS120     - OS 1.20 for BBC Computer
MOS120x    - Appears to be OS 1.20 patched to remove CFS 'Locked' files
MOS120de   - Only difference is startup banner "Acorn OS"
MOS120os   - Only difference is startup banner "Acorn OS" and thin font
MOS120us   - OS A1.0 for US BBC - 20-line/25-line screen MODEs
MOS120host - OS 1.20 for 65Host BBC emulator
MOS123     - OS 1.23 for Acorn Business Machine
MOS200     - OS 2.00 for BBC B+
MOS200abc  - OS 2.00 for Acorn Business Computer
MOS210     - OS 2.10 for Cambridge Workstation
MOS230     - OS R0.3 for Reuters Terminal