They were limited because the number of valves needed became unrealistic, as did the power supplies needed to feed them electrons. Before that valves (vacuum tubes) were used for either analogue or limited digital computers. High speed circuitry used ECL (emitter coupled logic) which operated the transistors in the non-saturated (not turned fully on) to obtain higher speed. In the early days, we had RTL (resistor-transistor logic) along with DRL (diode-resistor logic), DTL (diode-transistor logic), TTL (transistor-transistor logic), PMOS (P-Channel metal oxide field effect transistors - MOSFETs) then CMOS (complementary MOSFETs, both P and N-Channel). 5.0 Flip-Flops, Counters And Shift-Registers.
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