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A good memory jogger for the emergency transponder codes is: Hi Jack, I can’t talk right now, I’ve got an emergency.

7500 -> Being Hijacked 7600 -> Radio/Comms Failure 7700 -> Emergency

I think 1202 is not intended to be a transponder code, but an approximation of 121.5.

Could be. I just assumed squawk. (121.5 is the universal emergency VHF audio comm frequency.)

Yes, I meant 121.5 but my memory is fuzzy after many years.

There's also "7-7: we're going to heaven; 7-5: somebody else wants to fly; 7-6: radio needs a fix".