2F0800 INT 2F U - DRIVER.SYS support - INSTALLATION CHECK
2F0801 INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE
2F0802 INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST
2F0803 INT 2F U - DOS 4.0+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST