Off topic -- Some interesting pictures/info on 1960s-1980s (and before/after) silicon litiography technology : http://www.iwailab.ep.titech.ac.jp/pdf/iwaironbun/2015iitb.pdf A few examples: Pic of a 64kb DRAM wafer from 1979, 1k SRAM 2 inch wafer from 1974 wafer yield chart from 1974-1975 for 1kbit SRAM 1906 Vacuum tube, pic of 1947 Bipolar transistor 1970 Intel 1kbit dRAM, and 4004 CPU die pics