"Break Caused by NMI" Message Displayed by CodeView

ID Number: Q70056

3.00 3.10 3.11 3.14

MS-DOS

Summary:

When running real-mode CodeView (CV.EXE) version 3.0 or later, the

message "Break caused by NMI" may occur. This message is caused by a

call to INT 2H (interrupt 02H is defined as the NMI -- the nonmaskable

interrupt).

INT 2H is usually invoked by a memory parity error, but it may also be

generated by an add-on hardware debugger with a "break" switch.

CodeView traps this interrupt and displays the above message in the

command window. You can still continue to debug the program following

the break.

To turn off trapping of the nonmaskable interrupt and 8259 interrupts,

run CodeView with the /I0 option. To disable the trapping of the NMI

only, use the /N0 option.