I might be way off by some factor truth i dont know about, F stands for PNP transistor and B stands for NPN transistor. P is positive, N is negative, because i dont know what im doing, the general idea is really the only thing totally factual here.
Ill get my arse into doing TTL properly soon!
that picture is 2 bits only, because you have to put a space between, to fire the advancement clocks at once, and you toggle the advancement clocks as well, so to get 134 megs takes 168 billion transistors, so its about 1100 transistors a megabyte, so its well not anything useful yet.