Artifact Details

Title

Atanasoff-Berry Add-Subtract Module (replica)

Catalog Number

102624592

Type

Physical object

Date

1996 ca.

Manufacturer

Iowa State University. Ames Laboratory

Place Manufactured

Ames, IA, US

Dimensions

overall: 4 3/4 in x 7 in x 5 in

Description

This Add-Subtract Module (ASM) was created for the 1997 Reconstruction of the Atanasoff-Berry Computer (ABC) and is a copy of one of the 30 parallel ASMs used in the original 1942 computer. Its seven dual-triode vacuum tubes (6C8) combined two bits and a carry/borrow bit to produce a sum or difference bit and a carry bit. Each ASM operated serially on a 50-bit number from right to left, producing a binary result accurate to 15 decimals.

Category

Component: circuit board / module

Credit

Courtesy of John Gustafson

Lot Number

X2446.2002