DOCUMENT:Q36011 03-DEC-1999 [msdos] TITLE :Reading Serial Port Information Impossible PRODUCT :Microsoft Disk Operating System PROD/VER:MS-DOS:4.0,5.0,5.0a,6.0,6.2,6.21,6.22 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft MS-DOS operating system versions 4.0, 5.0, 5.0a, 6.0, 6.2, 6.21, 6.22 ------------------------------------------------------------------------------- SUMMARY ======= 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 : Technology : kbMSDOSSearch kbMSDOS400 kbMSDOS621 kbMSDOS622 kbMSDOS620 kbMSDOS600 kbMSDOS500 kbMSDOS500a Version : MS-DOS:4.0,5.0,5.0a,6.0,6.2,6.21,6.22 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.