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Values for IOCTL category code

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Value Description

00h

unknown (DOS 3.3+)

01h

COMn: (DOS 3.3+)

02h

reserved for terminal control

03h

CON (DOS 3.3+)

04h

reserved for keyboard control

05h

LPTn:

07h

mouse control (European MS-DOS 4.0)

08h

reserved for disk control -- same as for block devices (see INT 21/AX=440Dh)

9Eh

Media Access Control driver (STARLITE)

00h - 7Fh

reserved for Microsoft

80h - FFh

reserved for OEM/user-defined

See Also:

#01558