## Virtual Device Driver Reference for OS/2

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### Introduction

Virtual device drivers are used by the OS/2* operating system to act as virtual devices for DOS applications executing in a DOS session. These device drivers provide virtual hardware support for DOS and DOS applications.

The virtual device drivers shipped with OS/2 will virtualize most of the standard devices, including:

Asynchronous Communication (RS-232C)
DMA (Direct Memory Access)
Fixed Disk and Diskette
Keyboard
Mouse
Parallel Port Printer
PIC (Programmable Interrupt Controller)
Timer
Video

This book provides an overview of the virtual device driver mechanism and the available kernel services.