I think I learned binary before decimal watching my dad build vacuum tube flip-flops and eventually binary/decimal Nixie tube displays. I grabbed the hot end of an iron for him in 1957 and was branded for life.

Built a GE Project Analog Computer kit in 1962, a digital computer in 1965.

Finally got a PDP-8 clone DCC-112H in 1977. Built an Altair 8800 (1/4 K RAM) in 1975 and worked with 8080,SBC-8010, 8085, SDK-85, Z80, Prolog 4040 & 8085, Z8671, Prompt80, Prompt48, 8048, 8748, 8749, SDK-51, 8051, SC/MP, PACE, MK38P75, NSC800, HD64180, PICs 12C509, F84, 627, 877, NS87P50, 8088, 8086, 80...., Rabbit 1000 & 4000, ATmega328, ATtiny45-85, PICkit2, PICkit3. Dabbled with 4004, 4040.

Currently: Arduino, Rabbit BL4S100, Duinomite Mini, Duinomite Mega, PCduino, Beaglebone Black, TI MSP430, Raspberrypi Models A and B, MK802, LPC1347, LPC1115, LPC1768 AppBd, DE0-NANO, EPM240.

I get more powerful every day...bwah,ha,ha.