Forty years ago, my father (a technician in Radio-Diagnostic machines) gave to my little brother and me a kind of nano-computer with 99 bytes for machine code and no RAM but the processor's Accumulator and 2 more registers.
Since then, my live went all around computers in the medical and business area, programming, networking, reverse engineering, the 3D world when it was feasible, the electronics, the games and simulators and a long 'etcétera'.
I miss those days when you needed to optimize your code up to the last byte. I regret that the medical world has not gained so much as I hoped and, sometimes, I am terrorized of what the old BBSs have become, the today's Internet. I, sincerely, had better forethought of what they eventually should became.
Something I'm not disappointed of is the big brain we are building; the knowledge of the humanity at the very second you request it. The forums, I don't regret.