The minicomputer donated by Plessey to Stanford that Ted Hoff referenced is likely the Plessey System 2000.

Context and Reasoning:

Ted Hoff joined Intel in 1969, and the Intel 4004 microprocessor project began in 1970, suggesting the relevant timeframe for the donation is the late 1960s. Plessey, a UK-based company, developed the Plessey System 2000 series in the mid-1960s. This was a 16...

Short answer: it was almost certainly an Elliott 900‑series minicomputer (most likely an Elliott 903), supplied to Stanford by Plessey, which was acting as the U.S. distributor.

Why this fits

• Plessey itself did not have a generally available, standalone “minicomputer” line in the mid‑1960s. Their own general‑purpose machine of note, the Plessey System 250 (a capability‑based design), didn’t app...

This is an intriguing question about computing history. Based on the timeframe and context, there are a few possibilities for what Plessey computer Ted Hoff might have been referring to:

Most Likely Candidates:

1. Plessey XL9: In the late 1960s, Plessey did develop the XL9, which was a smaller computer system compared to their mainframe-sized machines. While not widely known, it could qu...

Plessey Computer at Stanford: Historical Context

This is an interesting historical computing mystery. Based on the information provided, I can offer some context and potential explanations, though a definitive identification would require additional research.

What We Know About Plessey Computing Systems

Plessey was indeed primarily known for larger systems rather than minicomputers during ...

I need to recall what I...

Plessey never really had a “PDP-8-killer” on the open market in the mid-’60s, but they did develop a small, microprogrammed real-time computer for their own telephone-exchange and Linesman‐radar projects in exactly that era. In the Plessey literature of the late 1960s it is almost always referred to simply as their Real-Time Computer (or internally as the “250” series), and it is the only machine...

This is an excellent question that delves into a key moment in computing history. The user's reasoning is sound, but they are missing one key piece of information: Plessey did develop a highly advanced, modular computer system that fits the description, and one was indeed sent to Stanford.

Here is a comprehensive answer that could be posted on Retrocomputing SE.

The Plessey System 250...

The machine Ted Hoff was talking about was a Plessey System 250 (often written simply “P250” or “Plessey 250”).
A single–cabinet System 250 was delivered to Stanford University’s Digital Systems Laboratory in 1967 as a gift from Plessey and was still there when Hoff was doing graduate-student and post-doctoral work. In the oral-history interview he recorded for the Computer History Museum (CHM ...

The machine Ted Hoff was talking about was the Plessey System 250 (often written PP-250).

What the System 250 was
• Designed in the mid-1960s by the Computer Division of the British defence and telecommunications firm Plessey.
• First described in public at the 1967 Fall Joint Computer Conference (“A Capability—Directed Addressing Architecture,” N. H. Fields & M. J. R. Healy).
• Physically ...