Firepower is the first pinball game to implement a "lane change" feature: By hitting the right flipper, any lights that are lit in a lane will shift one lane to the right (or wrap around if at the last lane). So that's pretty cool.
Developer Credits#
A copyright message, programmer credit, and build date are in the main CPU at 0x5DC0 (0xCC0 on chip ic6):
COPYRIGHT - WILLIAMS ELECTRONICS - 10/30/79 - PGD"PGD" is Paul G. Dussault, who worked on the speech processing of many of the early voiced Williams games.
(Source: Original TCRF research)