[vcf-midatlantic] OT: 60s/70s/80s Lithography tech

John Heritage john.heritage at gmail.com
Wed Mar 28 20:37:00 EDT 2018

Off topic --

Some interesting pictures/info on 1960s-1980s (and before/after) silicon
litiography technology :

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

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