I think it was either Sea Wolf II or Depthcharge - they are both from 1977, they are both about submarine warfare (just from different angle, in one you're controlling sub, in other destroyer), I know I played both of them as a kid in late 70s, but I'm not sure which one first.
Then it was arcades, arcades, arcades, all throughout their Golden Age ('79-'82) and a friend of mine had Atari 2600, so I've played a bit of that.
Around '82 I got Nintendo's Game&Watch Mickey Mouse and then in '83 I was introduced to home computers via ZX Spectrum (friend's) and C64 (mine), which changed completely how I looked at games and gaming from that point onward.







