Quite by accident I stumbled on the universal codes for these GE converter boxes. I never would have guessed but it's a TV code !
Just look up the TV code for a Scott or TMK television. You get just the basic On/Off, Ch up/Ch dn.
So now you don't have to go out and buy a new remote to clutter your place.
Guess the only ones left to crack on old remotes are the Channel Master and Zenith (LG) codes.