My road-trip pointed me to Counter Steer, the other GNW in the zerotrgt.c driver. Seems to be similar but not the same HW as Zero Target, video part is improved/changed over the other game (for example the roz can do a full 360° rotation) and it currently needs a kludge to let it boot due of a weirdness into the comms. Colors uses default MAME palette because proms are undumped for this one, yay…