Interesting. One note, the TTL was a very successful family of integrated logic devices (the 7400 series introduced by Texas Instruments), but it wasn&#x27;t the first. The earliest was RTL (resistor-transistor logic). Many years ago I built an RTL circuit that played the game of Nim [1] on up to four heaps and 15 counters per heap, using perfect strategy.<p>Other logic families were ECL, IIL, and my favorite for simple projects CMOS (very low power that could be supplied at a range of voltages).<p>[1] <a href="http:&#x2F;&#x2F;www.math.cornell.edu&#x2F;~mec&#x2F;2003-2004&#x2F;graphtheory&#x2F;nim&#x2F;howtoplaynim.html" rel="nofollow">http:&#x2F;&#x2F;www.math.cornell.edu&#x2F;~mec&#x2F;2003-2004&#x2F;graphtheory&#x2F;nim&#x2F;h...</a>