Rockwell-Anita Calculators
Rockwell 21R
Rockwell 21R

Rockwell 21R.

9v (PP3).

Display is 8 digits, red LED.

Four function, %, memory.

Chip is Rockwell A5300PD, here date coded mid-1975.

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

Made in Great Britain, at the former Sumlock-Anita factory in Portsmouth.
Inside

Inside, showing the circuit board. The LED module with the moulded-in lenses is towards the top, while the Rockwell integrated circuit is towards the bottom.
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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 Desk Calculators
Transistors & Integrated Circuits
ANITA LSI Desk Calculators
ANITA Hand-held Calculators
Rockwell-ANITA Calculators
Calculators made by others
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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
ANITA 811 SL
ANITA 1211
ANITA 1211 SL
ANITA 1211P
ANITA 1216
ANITA 102
ANITA 201
ANITA 202/SR
Rockwell 20R
Rockwell 21R
Rockwell 30R

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Text & photographs copyright © 2002 - 2010 Nigel Tout, except where noted otherwise.