Microsoft KB Archive/93218

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MS-DOS/Win16 Serial Communication Applications on NT

Article ID: 93218

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1

This article was previously published under Q93218


When running MS-DOS or Windows version 3.1 serial communications applications that directly access serial port hardware, you may enhance performance of these applications by using software handshaking (xon/xoff) instead of hardware handshaking (cts/rts).

Because hardware must be virtualized under NT, checking the cts/rts signals directly will incur an unavoidable performance degradation. Using xon/xoff handshaking avoids this problem since xon/xoff handshaking does not require accessing the serial port hardware directly.

Note that this does not apply to Windows version 3.x or Win32 applications that correctly use the Comm APIs to do communications.

Additional query words: prodnt handshaking cts rts

Keywords: kbhardware KB93218