Int 21/AX=4403h

DOS 2+ - IOCTL - WRITE TO CHARACTER DEVICE CONTROL CHANNEL

AX = 4403h
BX = file handle referencing character device
CX = number of bytes to write
DS:DX -> data to write

Return:
CF clear if successful
AX = number of bytes actually written
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). If the file handle refers to "4DOSSTAK", the 4DOS (v2.x-3.03) KEYSTACK.SYS driver will push the specified characters on the keyboard stack; similarly for "NDOSSTAK", the NDOS KEYSTACK.SYS driver will push the characters onto the keyboard stack. This function was not supported by Digital Research's DOS Plus

See Also: AX=4400h - AX=4402h"DOS 2+" - AX=4405h"DOS" - I

Category: DOS Kernel - Int 21h - D

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