Introduction

Rockwell-Anita Calculators
Rockwell 20R
Rockwell 20R

Rockwell 20R.

9v (PP3).

Display is 8 digits, red LED.

Four function, %, memory.

Chip is Rockwell A5300PA, here date coded end of 1974.

76 x 153 x 23 mm (3.0" x 6.0" x 0.9").

Country of manufacture: England or Mexico, or both, see labels below.
Inside

Inside, showing the circuit board and the keyboard, which plugs in.
Box
Label 1

A label stuck on the back of the box says "Assembled in Great Britain by Sumlock Anita Ltd.

This was one of a series of Rockwell hand-held calculators launched as "The Answer".
Label 2

The label on the back of the calculator says "Assembled in Mexico. U.S. and Foreign Parts".

Maybe both of these labels are correct. To reduce import duties it is possible that the circuit boards were assembled in Mexico, and were then delivered to England, together with the case and other parts, for final assembly there.
Home
Introduction
Origins of Bell Punch Co.
Mechanical Calculator Days
National Calculating Service
Development of Anita 1
Development of Anita 2
Anita is Launched
At work with Anita
All Change at Bell Punch
Anita Developed Further
Anita at its Zenith
The Rockwell Connection
Demise of Anita & Bell Punch
Mechanical Calculators
Early Anita Desktop Calculators
Transistors & Integrated Circuits
Anita LSI Desk Calculators
Anita Hand-held Calculators
Rockwell-Anita Calculators
Calculators made by others
Advertisements & Brochures
Operating Manuals & Materials
Company Information
A Tour of Company Sites
Summary
The Technology Explained
Operating a Comptometer
Old Sterling Currency, £sd
Links
Update Information
Getting in touch

Rockwell-Anita Calculators
811 SL
1211
1211 SL
1211P
1216
102
201
202/SR
Rockwell 20R
Rockwell 21R
Rockwell 30R

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Text & photographs copyright © 2002 - 2008 Nigel Tout, except where noted otherwise.