Dr. Who Pinball Software Revision Information U6: Version L-2 Checksum: 4002 Date: November 10, 1992 Changes from revision L-1: Minor preset adjustment changes for France and Germany. Autocycle burn-in now fires popper 20 times to prevent early fatigue, and the mini-playfield will cycle only if coin door is closed and the playfield glass switch is closed. U6: Version L-1 Checksum: 9601 Date: October 16, 1992 Initial release to production.