MB Electronic battleship versions:
1977/79: uses 2 9v batteries, a tms1000(?) cpu, no codebook/instant programming, higher pitched sound; game has a RED light bulb *below* the ship in the 'ship' lower backdrop which is clear/untextured, and the text next to the white switches on each side (FIRE, ON/OFF, LOAD/GO) is painted white
1982: uses 4xAA batteries, an unknown cpu (???tms1400???), has the RED-ORANGE codebook for instant programming, lower pitched sound; game has a RED ?LED? *above* the ship in the 'ship' lower backdrop which is red and textured, and the text next to the white switches on each side (FIRE, ON/OFF, LOAD/GO) is unpainted (and hard to read); bezel is same design as 1977/79 version.
1989: Talks. uses 4xAA batteries, a TSP50C10A cpu, has the BLACK codebook for instant programming, mixed LPC Speech/PCM/Synthesized sound; game has a RED LED *above* the ship in the 'ship' lower backdrop which is red and textured. Has a 1-player mode. The 'entry' control panels on each side are completely different from the 1977/1979 and 1982 versions, with a single row of yellow rubber buttons and a larger yellow fire button, plus a green ON button on player 1's side. The 'bezel' of the upper 'target area' has a different design printed on it than the older versions.
1977/79 version demo and 1982 version comparison: https://www.youtube.com/watch?v=j7vKyQlWpbA
1982 version demo: https://www.youtube.com/watch?v=Rr5TD34z8FQ
1989 version demo: https://www.youtube.com/watch?v=4TuhedOCP-8
EDIT: Btw Sean, since you ripped apart one of the 1989 ones, I realized one of the clear blue plastic target grid panels on mine has a crack in it. Is there any chance you can spare one from the one you tore up?