A report on Accumulator (computing) and IBM 701

Walther WSR-16 mechanical calculator. The row of digit-wheels in the carriage (at the front), is the Accumulator.
IBM 701 operator's console
Front panel of an IBM 701 computer with lights displaying the accumulator and other registers
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

Most of IBM's early binary "scientific" computers, beginning with the vacuum tube IBM 701 in 1952, used a single 36-bit accumulator, along with a separate multiplier/quotient register to handle operations with longer results.

- Accumulator (computing)

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

- IBM 701
Walther WSR-16 mechanical calculator. The row of digit-wheels in the carriage (at the front), is the Accumulator.

1 related topic with Alpha

Overall

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

0 links

Early digital computer produced by IBM in the mid-1950s.

Early digital computer produced by IBM in the mid-1950s.

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.
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

The 650 was marketed to business, scientific and engineering users as a general-purpose version of the IBM 701 and IBM 702 computers which were for scientific and business purposes respectively.

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.