IBM PCjr Manual page 255

D Have your IBM PCyr serviced.
See "Service Information" in
this section.
Do you want to run another test?
YES - Go to "Running the IBM
PCyr Tests" in this section.
NO - If you have a diskette drive
installed, you may run the
"Exploring the IBM PC/r"
diskette at this time. If you
have run the "Exploring the
IBM VCjr" diskette before,
you may continue normal
operations.
Internal Modem Test 6-113