The Answer: Rockwell Model 20R Calculator

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Electronic calculator with memory and percent:

  • 8 digit LED display
  • Algebraic logic
  • Floating decimal
  • Repeat function
  • Battery operated
  • AC jack
  • Clear entry
  • Full accumulating memory
  • Automatic constants
  • % key
  • Mark-on and discount
Our exhibit has the original box and operators manual. Serial number 140550.

Manufacturer: Rockwell
Date: 1974

Other Systems Related To The Answer: Rockwell Model 20R Calculator:

Item Manufacturer Date
Rockwell Electric Printing Calculator 212P Rockwell Unknown
Rockwell Model 18R Calculator Rockwell 1975
Rockwell 920 Rockwell International 1st January 1975
Rockwell 44RD Calculator Rockwell International 1976

This exhibit has a reference ID of CH31474. Please quote this reference ID in any communication with the Centre for Computing History.


The Answer: Rockwell Model 20R Calculator

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