A report on Accumulator (computing) and IBM 650

Walther WSR-16 mechanical calculator. The row of digit-wheels in the carriage (at the front), is the Accumulator.
Part of the first IBM 650 computer in Norway (1959), known as "EMMA". 650 Console Unit (right, an exterior side panel is open), 533 Card Read Punch unit (middle, input-output). 655 Power Unit is missing. Punched card sorter (left, not part of the 650). Now at Norwegian Museum of Science and Technology in Oslo.
Front panel of an IBM 701 computer with lights displaying the accumulator and other registers
Part of the first IBM 650 computer in Norway (1959), known as "EMMA". 650 Console Unit (right, an exterior side panel is open), 533 Card Read Punch unit (middle, input-output). 655 Power Unit is missing. Punched card sorter (left, not part of the 650). Now at Norwegian Museum of Science and Technology in Oslo.
IBM 650 at Texas A&M University. The IBM 533 Card Read Punch unit is on the right.
IBM 650 console panel, showing bi-quinary indicators. (At House for the History of IBM Data Processing (closed), Sindelfingen)
Close-up of bi-quinary indicators
Memory drum from an IBM 650
Side view of an IBM 650 Console Unit. First computer in Spain (1959) now at National Museum of Science and Technology in A Coruña
IBM 650 at Texas A&M, opened up to show rear of front panel, vacuum tube modules and storage drum
Vacuum tube circuit module of type used in the 650
A classroom in 1960 at the Bronx High School of Science with IBM 650 instruction chart above blackboard, upper right

Data read from the drum went through a 10-digit distributor. The 650 had a 20-digit accumulator, divided into 10-digit lower and upper accumulators with a common sign.

- IBM 650

The IBM 650, a decimal machine, had one 10 digit distributor and two ten-digit accumulators; the IBM 7070, a later, transistorized decimal machine had three accumulators.

- Accumulator (computing)
Walther WSR-16 mechanical calculator. The row of digit-wheels in the carriage (at the front), is the Accumulator.

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Overall

IBM 701 operator's console

IBM 701

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IBM’s first commercial scientific computer and its first series production mainframe computer, which was announced to the public on May 21, 1952.

IBM’s first commercial scientific computer and its first series production mainframe computer, which was announced to the public on May 21, 1952.

IBM 701 operator's console
IBM 701 processor frame, showing 1071 of the vacuum tubes
Vacuum tube logic module from a 700 series IBM computer.
Williams tube from an IBM 701 at the Computer History Museum

The business-oriented sibling of the 701 was the IBM 702 and a lower-cost general-purpose sibling was the IBM 650, which gained fame as the first mass-produced computer in the world.

1) The accumulator was 38 bits long (adding two overflow bits).