IBM PCjr

4. Set the system unit's Power switch to On.
5. Bring the advanced-test menu to your screen.
6. Move the cursor to the ID "I" under the RS232.
7. Press the Enter key.
The test takes approximately four minutes to complete.
DO YOU HAVE " * " UNDER THE RS232?
3-840-2 RS232
The system board is bad. Replace it.
Repeat advanced POST and the advanced
tests to ensure that the IBM PC;> is operating
correctly.