Ted Hoff — Bernard Widrow's Stanford PhD student and co-inventor of the LMS/ADALINE — went on to architect the Intel 4004, the first commercial microprocessor

hoffwidrowadalinelmsintel-4004microprocessorneural-networkshistory-of-computingcross-domain

Marcian "Ted" Hoff completed his Stanford PhD under Bernard Widrow in the early 1960s, and the dissertation work was not incidental to neural-network history: Hoff co-invented the least-mean-squares (LMS) filter and the ADALINE with Widrow. LMS is the single-layer gradient-descent rule at the base of the Madaline line (claim-madaline-rule-i-first-layer-trainable-second-fixed); ADALINE is the adaptive linear element it trained. The same person, in other words, sits at the origin of the adaptive-filter lineage the vault maps around the backpropagation-gap.

Hoff then left neural-net research for Intel, joining in 1968 as one of its earliest employees. There he is credited with proposing the general-purpose-processor architecture — a single programmable "universal" chip in place of a set of custom logic circuits — that became the Intel 4004 (1971), the first commercial microprocessor. Busicom had specified a multi-chip calculator design — a seven-chip proposal, per Wikipedia's "Intel 4004" article; the cited "Marcian Hoff" article does not carry this detail — and Hoff's counter-proposal of a compact programmable CPU (the four-chip CPU/ROM/RAM/I-O architecture) was adopted instead. (The transistor-level silicon design of that chip was executed separately by Federico Faggin — see claim-faggin-4004-designer-argues-classical-silicon-cannot-be-conscious.)

This is the concrete bridge behind the passing note, in claim-widrow-abandoned-multilayer-training-until-1985-backprop, that "Hoff went to Intel": Widrow's own PhD student and LMS co-author is also the architect of the microprocessor. Two fields not usually spoken in one sentence — 1960s neural-network theory and the invention of the CPU — share a single genealogical link. See moc-backpropagation-origins.