INT 21,44,2 / IOCTL,2 - Read From Character Device

AH = 44h

AL = 02

BX = handle

CX = number of bytes to read

DS:DX = pointer to data buffer

on return

AX = number of bytes read if CF clear

= error code if CF set (see ~DOS ERROR CODES~)

- see bit 14 if IOCTL function 00h to determine if

driver can support IOCTL control strings