Function 44h I/O Control for Devices (IOCTL) Get or Set Device Information entry AH 44h AL 03h Write Device Control String BX device handle CX number of bytes to write DS:DX pointer to buffer return AX number of bytes written
entry AH 44h
AL 03h Write Device Control String
BX device handle
CX number of bytes to write
DS:DX pointer to buffer
return AX number of bytes written