FAS

Computing at Los Alamos in the 1940s and 1950s

07.14.08 | 1 min read | Text by Steven Aftergood

Last week, in response to a request from Secrecy News for a copy of a thirty year old history of computer development at Los Alamos in the 1940s and 1950s, a reference librarian at Los Alamos National Laboratory apologetically explained that she could not release the requested document.

“We are sorry but due to a mandate from NNSA to the Laboratory and Research Library policies, we are unable to provide technical reports until further notice,” the librarian wrote. You want information from the Library? Don’t be silly!

Fortunately, a copy of the document (pdf), which was not otherwise available online, was obtained independently and it has been added to our Los Alamos document collection.

Among other curiosities, the report describes work on an early chess-playing program for the MANIAC computer in the 1950s:

“Because of the slow speed of MANIAC (about 10,000 instructions per second) we had to restrict play to a 6 by 6 board, removing the bishops and their pawns. Even then, moves averaged about 10 minutes for a two-move look-ahead strategy.”

See “Computing at LASL in the 1940s and 1950s” by Roger B. Lazarus, et al, report number LA-6943-H, May 1978.

publications
See all publications
Government Capacity
Press release
Denice Ross of the Federation of American Scientists Named NAPA Academy Fellow

Denice Ross, former U.S. Chief Data Scientist and Data Policy Institute lead at the Federation of American Scientists, will be honored for her stewardship of public data by the National Academy of Public Administration, where she has been named a Fellow.

11.10.26 | 3 min read
read more
Global Risk
Blog
NATO Nuclear Posture Moving North; New Satellite Images Show Extent of New Construction at RAF Lakenheath

Confirmation that the construction of the security perimeter and associated security infrastructure at RAF Lakenheath are still ongoing once again raises questions about whether U.S. nuclear weapons have already been deployed to the base.

11.05.26 | 7 min read
read more
Climate & Environment
Blog
New Climate Intervention Regulation in Alaska Takes Inspiration from Permitting That Already Works

Alaskans are sensibly pulling back from the vogue for bans and returning to a western tradition that has worked for more than half a century – one that welcomes innovation but also oversees it closely.

11.05.26 | 3 min read
read more
Government Capacity
Blog
Why America Needs to Grow the Field of Data Policy

The strength of our nation’s data policy isn’t just in the rules we write, but in how effectively we translate those rules into a system that prioritizes the public good. Join us in this movement to design and build more resilient national data policies.

11.02.26 | 5 min read
read more