Microsoft KB Archive/247594

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Fatal System Error: 0x00000077 when IRQ 2 Is Assigned to COM Port

Article ID: 247594

Article Last Modified on 11/1/2006


  • Microsoft Windows 2000 Professional Edition

This article was previously published under Q247594


On a Microsoft Windows 2000 Professional-based computer that has an Award 4.51 PG basic input/output system (BIOS), when you disable communications port 2 (COM2), assign interrupt request line (IRQ) 2 to COM2, and then restart the computer, the following fatal system error occurs:

Fatal System Error: 0x00000077


This behavior occurs because IRQ2 is a cascade interrupt for IRQ8 through IRQ15 and is not available for assignment to a COM port.


Microsoft has confirmed that this is a problem in Microsoft Windows 2000 Professional.

Additional query words: device pnp plug and play

Keywords: kbbug kbpending KB247594