Virtual DMA Services (VDS) Application Note Available

 Last reviewed: February 15, 1996
Article ID: Q93470
The information in this article applies to:
  • Microsoft Windows Software Development Kit (SDK) for Windows versions 3.1 and 3.0

In the MS-DOS environment, an application that performs direct memory access (DMA) programs the hardware DMA controller with a memory buffer address. However, in the Microsoft Windows environment, the application cannot directly determine the buffer address. Therefore, Windows provides the Virtual DMA Services (VDS) to provide the information required to program the DMA controller.

An application note that describes the VDS is now available. Application note PW0519 details the data structures and services required to implement the VDS in a DMA device driver in the Windows environment.

Application note PW0519 is available in the Software/Data Library, through the Microsoft Download Service (MSDL), or directly from Microsoft. In the United States, application notes can be obtained by calling Microsoft Product Support Services at (206) 454-2030. Outside the United States, contact the Microsoft subsidiary or distributor that serves your country.

Download PW0519.EXE, a self-extracting file, from the Microsoft Software Library (MSL) on the following services:

  • Microsoft Download Service (MSDL) 

          Dial (206) 936-6735 to connect to MSDL
      Download PW0519.EXE (size: 25556 bytes)
  • Internet (anonymous FTP) 

          ftp ftp.microsoft.com
      Change to the \SOFTLIB\MSLFILES directory
      Get PW0519.EXE (size: 25556 bytes)

Additional reference words: 3.00 3.10 appnote softlib PW0519.EXE
KBCategory: kbprg kbappnote kbfile
KBSubcategory: KrMm

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Last reviewed: February 15, 1996
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