I/O System
I/O System may refer to:
- DOS BIOS (Basic Input/Output System), a low-level component in DOS operating systems, including PC DOS and DR-DOS
 
- I/O System (86-DOS), the DOS-BIOS specifically in 86-DOS
 - I/O System (MS-DOS), the DOS-BIOS specifically in MS-DOS
 
See also
    
- BIOS, Basic Input/Output System
 - XIOS, Extended Input/Output System
 - CP/M BIOS, the BIOS in the CP/M family of operating systems
 - BIOS (disambiguation)
 - IOS (disambiguation)
 - IOCS, Input/Output Control System
 
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