Lock On (Philko)

Lock On is a horizontal shmup from Philko which according to the MAME team has been released in 1991. Very little information is available about this game prior to a board surfacing in 2016. The hardware is basically bootlegged from Sega's System 16 (with some significant changes) and features the distinctive Sega sprite system. This isn't too surprising because 2 of Philko's other games run on boards that are close to the System 16 hardware, albeit without any sprites and other enhancements in those case.