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Microsoft KB Archive/36011

From BetaArchive Wiki
Knowledge Base

Reading Serial Port Information Impossible

Article ID: 36011

Article Last Modified on 5/12/2003


  • Microsoft MS-DOS 4.0 Standard Edition
  • Microsoft MS-DOS 5.0 Standard Edition
  • Microsoft MS-DOS 5.0a
  • Microsoft MS-DOS 6.0 Standard Edition
  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.21 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q36011


In MS-DOS, it is possible to configure a serial port (COM1, COM2) with the MS-DOS MODE command or by using interrupt 14H. It is not possible to obtain the settings of a serial port using the MS-DOS MODE command. The ability to obtain this information through the interrupt 14H is an OEM ROM BIOS issue. If it is supported through the ROM BIOS, the information can be obtained. The standard IBM ROM BIOS does not support this functionality, but the IBM Advanced BIOS (ABIOS) does. The ABIOS services are only available on IBM (or compatible) PS/2 systems.

Additional query words: 6.22 4.00 5.00 6.00 6.20

Keywords: KB36011