## Physical Device Driver Reference

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### Installation of External Loadable Device Drivers

System installation provides the ability to install Device Support Diskettes. The user who has hardware not currently supported by OS/2 2.1 ( or later) can install a specific hardware device driver from a Device Support Diskette during the system installation.

Note: The user can install device drivers after OS/2 installation using one of the following methods:

Entering DDINSTALL command at an OS/2 command prompt

Double-clicking the Device Driver Install object (located in the System Setup folder)

The user can install external loadable device drivers through the system utility program DDINSTAL.EXE. A Device Driver Profile (a file with a DDP file name extension) must be provided (by the device driver programmer) to control the installation of the device driver using DDINSTAL.EXE. The format of this file is described under Device Driver Profile. A diskette containing device drivers with their corresponding Device Driver Profiles is called a Device Support diskette. DDINSTAL.EXE installs all Device Driver Profiles that are on a Device Support diskette. When the installation is finished, DDINSTAL.EXE prompts the user to restart the system, causing the updated CONFIG.SYS file to take effect.

Note: DDINSTAL.EXE is not intended for the installation of presentation drivers.