Int 21/AX=4402h

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DOS 2+ - IOCTL - READ FROM CHARACTER DEVICE CONTROL CHANNEL

AX = 4402h
BX = file handle referencing character device
CX = number of bytes to read
DS:DX -> buffer

Return:
CF clear if successful AX = number of bytes actually read CF set on error AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

Notes: Format of data is driver-specific (also see separate entries below for some specific cases). This function was not supported by Digital Research's DOS Plus

See Also: AX=4400h - AX=4403h"DOS" - AX=4404h"DOS" - INT

Category: DOS Kernel - Int 21h - D

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