Microsoft KB Archive/100111

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Maximum Number of LPT and COM Ports

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Q100111

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The information in this article applies to:


 * Microsoft Windows NT Server version 3.1
 * Microsoft Windows NT Workstation version 3.1

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The maximum number of COM and LPT ports that Windows NT supports is 256. This is a limitation in Control Panel and does not represent a limitation of the hardware platform. In both Intel x86 and MIPS machines, the number of COM and LPT ports is only limited by available interrupts, I/O addresses and, ultimately, 4,294,967,295 (32 bits).

Additional query words: prodnt

Keywords : kbother

Issue type :

Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW310 kbWinNTSsearch kbWinNTS310 kbWinNTS310xsearch kbWinNT310xSearch kbWinNTW310Search