The story of loading bits into a 2102 by hand with toggle switches reminds
me of my PROM programmer for the Monolithic Memories 6330-1 PROM. My
"programmer" consisted of some BCD thumbwheel switches that I'd use to set
the address in octal (since they were not hex switches, I had to stop at
7). I had a rotary switch that selected which of the 8 data pins I was
looking at. A push button switch would drive the common of the rotary
switch with Vpp (which I think was 12V) to blow the nichrome fuse in the
chip. I programmed several hundred chips this way (they determined the
decimal point position on a telemetry system for radio stations, and every
one was different).

Harold




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