PRB: Reset A20 Bit Set During DPMI Simulate Interrupt Crash

ID Number: Q76582

3.00

WINDOWS

Summary:

SYMPTOMS

A Windows application that specifies "reset interrupt controller

and A20 line" when calling the MS-DOS protected mode interrupt

(DPMI) function "Simulate Real Mode Interrupt" can cause Windows to

crash.

RESOLUTION

Applications that use the "Simulate Real Mode Interrupt" function

must ensure that this bit is not set.

More Information:

The "Simulate Real Mode Interrupt" function is documented in the DPMI

specification.

Additional reference words: 3.00