Walther WSR-16 mechanical calculator. The row of digit-wheels in the carriage (at the front), is the Accumulator.
White ceramic Intel C4004 microprocessor with grey traces
Front panel of an IBM 701 computer with lights displaying the accumulator and other registers
The Unicom 141P is an OEM version of the Busicom 141-PF.
National Semiconductor was a second-source manufacturer of the 4004, under their part number INS4004.
Two C4004 DIPs, with one opened to show the die
Intel 4004 architectural block diagram
Intel 4004 DIP chip pinout
In the lower-right corner of the CPU are the initials "F.F."
The ceramic C4004 variant without grey traces
The ceramic D4004 variant
The plastic P4004 variant

He also modified the Branch Back (return from subroutine) instruction to clear the accumulator.

- Intel 4004

Early 4-bit and 8-bit microprocessors such as the 4004, 8008 and numerous others, typically had single 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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