HomeArticlesGeology & Earth Science

The Manchester Baby: The First Stored-Program Computer

The Manchester Baby, built in 1948, stands as a crucial milestone in computer history, representing the world’s first stored-program computer and laying the groundwork for artificial intelligence.

mysimulator teamUpdated June 2026≈ 3 min read▶ Open the simulation

Built by Freddie Williams and Tom Kilburn, the Baby was designed to test a new memory technology called the Williams Tube, which used cathode ray tubes to store bits of data as charged spots on a screen. This was the first reliable Random Access Memory (RAM).

Built by Freddie Williams and Tom Kilburn, the Baby was designed to test a new memory technology called the Williams Tube, which used cathode ray tubes to store bits of data as charged spots on a screen.

This was the first reliable Random Access Memory (RAM).

The Baby was not an AI machine itself, but it was the necessary precur

The Baby was not an AI machine itself, but it was the necessary precursor to all AI.

Before this, computers like ENIAC were 'programmed' by physically replugging cables. The Baby proved that software could be separated from hardware, allowing programs to be changed instantly and to modify themselves—a prerequisite for learning algorithms.

live demo · related simulation● LIVE

Alan Turing soon joined the Manchester team to use this new architecture

Alan Turing soon joined the Manchester team to use this new architecture

for his investigations into morphogenesis and machine intelligence, writing some of the earliest code for the machine's successors, the Manchester Mark 1.

Frequently asked questions

What was the significance of the Manchester Baby in the history of computing?

The Manchester Baby represented a pivotal moment in computer science, marking the transition from hardware-centric programming to software-based systems. It demonstrated the feasibility of storing and executing programs independently of the machine's physical components.

Who were Freddie Williams and Tom Kilburn, and what was their contribution?

Freddie Williams and Tom Kilburn were the key figures behind the design and construction of the Manchester Baby. They pioneered the use of the Williams Tube, a revolutionary memory technology that enabled random access to data – a fundamental concept in modern computing.

Try it live

Everything above runs in your browser — open Earthquake Wave Propagation Simulation and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Earthquake Wave Propagation Simulation simulation

What did you find?

Add reproduction steps (optional)