mirrorbird(00:17:00)
i remember in my teens picking up some book that tried to describe the registers as fingers, but you could also put on gloves (EXX exchange instruction), confused the hell out of me immediately
Agemixer(00:16:26)
yeah A=accu reg, X= X index reg, Y = Y index reg. But it has never restricted you know, you can use "zeropage" kinda added register, not 16bit addressing but 8bit (which does 1 cycle faster)