To run the TRACEEXP sample, you need one or both of the following lines in your CONFIG.SYS:
trace=on tracebuf=4
Be sure to restart your system if you make changes to CONFIG.SYS.
Turn on trace for the major code in this example by typing the following:
trace on 123
To run the sample, type:
traceexp
To turn the trace off, type:
trace off
To see the captured trace point, type:
tracefmt
This should show an entry with major code 123.