## Using Your DDK

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### Virtual Asynchronous Communications Device Driver

Driver Description:

The VCOM driver consists of virtual support for the serial communication I/ O ports and for the serial channel-related BIOS entry points.

This component allows extended DOS applications that access the communication channels, either by direct access to the I/O ports or by normal BIOS calls, to operate without change.

The VCOM driver supports access only to communication channels that are physically present on a given system. This does not include support for accessing communication devices that may be redirected by network software.

Compilers/Assemblers Required:

         Microsoft MASM 5.1      (supplied with the DDK)
         Microsoft CL386         (supplied with the DDK)

Build Instructions:

1.Set the environment variables so the correct tools are picked up during the build.

    e.g., SET PATH=<drive>:\DDK\TOOLS;%PATH%

Where <drive> represents your DDK installed drive and DDK represents the DDK installed directory. On the CD-ROM, the TOOLS directory path is DDK\ TOOLS.

2.Change the directory to DDK\BASE\SRC\VDEV\VCOM.

3.Invoke NMAKE on the resident makefile.

Files Created by Successful Build:

         Directory:  \DDK\BASE\SRC\VDEV\VCOM

         o  VCOM.SYS