Two bits per transistor high density ROM in Intels 8087 floating point chip 1

Two bits per transistor: high-density 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 multi-level ROM (Read-Only Memory) that stored two bits per transistor, twice as dense as a normal ROM. Instead of storing binary data, each […]

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