DOS Fn 4401H: IOCTL Set Device/File Flags
Compatibility: 2.0+
Expects: AX 4401H
BX file handle (device only)
DX IOCTL device info
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Returns: AX error code if CF is set to CY
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Info: This can change certain aspects of how DOS handles I/O with some
devices. It cannot be used to affect disk file handles.
Bits 8-15 (i.e. DH) must be 0
Bit 7 must be set (1) to indicate a device
Bit 5 selects "raw" or "cooked" mode for character devices
Other bits specify special devices. See IOCTL device info.
See Also: Fn 44H (IOCTL)
Fn 4400H (Query Device/File Flags)
DOS Functions
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