The procedure used to erase the Battlezone high score table is similar to that
of other atari games.
Put the game into selftest mode. Refer to your manual on where to locate
the sefltest switch. For uprights it is usually inside the coin door.
In selftest mode you should see a display that looks similar to this screen shot
below.
While in selftest mode, press and hold both the start and fire
buttons. When both buttons have been pressed at same time, you should immediately
see a message displayed on the screen with the text "ERASED". This is the
indication that the high scores have been cleared.
You can now release the buttons and exit selftest. The high score table will
be returned to the factory default scores and initials.