System software

System BIOS

• BIOS Functions

Disc operating systems

• 400K/S (SD Microsystems)
• AMSDOS (Amstrad)
• BASDOS
• BonnyDOS
• MagicDOS (Logon System)
• MS800 (Microstyle)
• NIGDOS
• ParaDOS (Quantum Computing)
• RODOS (Romantic Robot)
• ROMDOS and RAMDOS (KDS/Siren Software)
• S-DOS (STS)
• SymDOS (Flynn)
• UniDOS (Futurs')
• VDOS (Vortex)
• X-DDOS

IDE operating systems

• CubeIOS (FAT16+FAT32-IDE-OS ROM for the Amstrad CPC's with XMASS)
• UniDOS (Futurs')

Graphical user interfaces / Shells

• CBM (TFM) (2014-2024)
• CEUS Desktop 2.0 (Prodatron) (1990)
• Desk-Royal (Crusader Software) (1989)
• Desktop (David Wild DW Software)
• DES (Desktop Environment System) (Campursoft) (1994)
• GENO (GHE)
• Max desktop (Excel Software and Advanced Memory Systems) (1987)
• Mouse Operating System (M.O.S.) (Star-Division) (1987)
• SI-BOF (Bad Error) (1992)
• Stream2 (Advanced Software Project) (1994)
• WOPS (Camel) (1988)
• Worktop (Robot PD) (1991)

Operating Systems

• Contiki
• CPC OS
• CP/M 2.2
• CP/M 3.0 CP/M Plus
• FutureOS (TFM / FutureSoft)
• MicroDOS
• SymbOS (Prodatron / SymbiosiS)