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Two bits per transistor: high-density ROM in Intel's 8087 floating point chip
Another great IC photo and write up from Ken Shirriff which explains how Intel's 8087 used different gate widths in its ROM to encode two-bits of information per address.Thu Oct 11 12:41:11 2018 - permalink --
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http://www.righto.com/2018/09/two-bits-per-transistor-high-density.html