buses and ram capacitors

[Shrykull]

Ok, what is it that actually places a 1 or a zero onto a signal trace of a system bus, perhaps a single logic gate which all the others lead to, say 8 of them for an 8-bit bus etc. And with memory address bus, you use a different binary number to get each byte, so if you wanted the first one (and the bus was 8 bits wide) it would be 00000001 the second would be 00000010, third 00000011, so you get the byte that way, but what about the individual bits?