IBM PCjr Manual page 154

When a cartridge is inserted, your
IBM PC/r resets as if you had just
performed a reset from the
keyboard. The screen clears and
then the cartridge program screen
appears.
After the screen clears, does the
cartridge program screen appear?
YES - Remove the cartridge and
go to Step 14.
NO - Remove the cartridge and
go to Step 16.
14 Insert the cartridge into the right
cartridge slot of your IBM PC/r.
After the screen clears, does the
cartridge program screen appear?
YES - Go to Step 20.
NO - Go to Step 15.
6-12 First Things First