Tag: 8087

Two bits per transistor: high-density ROM in Intel’s 8087 floating point chip
IC

Two bits per transistor: high-density ROM in Intel’s 8087 floating point chip

Ken Shirriff has a detailed write-up about the multi-level ROM in Intel’s 8087 floating point chip: The 8087 chip provided fast floating point arithmetic for the original IBM PC and became part of the x86 architecture used today. One unusual feature of the 8087 is it contained a...

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