Rockwell 21R

This 21R was made at the Portsmouth factory (though examples were also made in Mexico—see here), and is a basic four function model with an added percent and memory. Note that, compared to the 8R or 18F, the equals key is moved to a more 'modern' position. I believe that the 21R is a 20R with rechargeable batteries and charger included (an accessory kit was available as a model 01R---in the U.S. at least). The markings are also different, with the memory M+, M- etc. missing from the 20R. The image on the left is of a contemporary advert from a U.S. magazine, showing the 21R and other models, from around 1976. Click on the image to enlarge.

This example has its I.C. labelled 7528 (1975 week 28). The manual for the 21R is available on the manuals page.

Try it out---it works!

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Last updated 24th April 2006.

© 2003-2006 Simon Southwell. All rights reserved.