{"id":5696,"date":"2022-01-11T16:46:55","date_gmt":"2022-01-11T16:46:55","guid":{"rendered":"https:\/\/loadzx.com\/sinclairworld\/?page_id=5696"},"modified":"2025-09-24T16:24:28","modified_gmt":"2025-09-24T16:24:28","slug":"wrist-calculator","status":"publish","type":"page","link":"https:\/\/loadzx.com\/sinclairworld\/wrist-calculator\/","title":{"rendered":"Wrist Calculator (1977)"},"content":{"rendered":"\t\t
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1977<\/div>
Sinclair Instruments<\/div><\/div>
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Sinclair Wrist Calculator<\/div>
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This build-it-yourself wrist calculator was launched <\/span>under <\/span>Sinclair Instrument; a company Clive Sinclair had <\/span>established<\/span> apart <\/span>from <\/span>Sinclair Radionics. <\/span>Designed by John Pemberton, it featured an eight-digit <\/span>LED <\/span>display and a ten-key interface that used a three-way switch to access full calculator functions. Its silver-toned face and <\/span>plastic casing <\/span>offered a glimpse of future wearable devices\u2014arriving at a time when personal electronics were getting smaller, more mobile, and increasingly part of daily life.<\/span><\/span>\u00a0<\/span><\/p><\/div><\/div><\/div>

1977<\/div>
Sinclair Instruments<\/div><\/div>
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Sinclair Wrist Calculator - 2nd Version<\/div>
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The second version of Sinclair\u2019s wrist-worn calculator featured a gold-<\/span>coloured<\/span> face and omitted the separate zero key. Operated with ten buttons and a three-position switch, it performed over 20 functions including memory recall, square roots, and percentages. Sold only in kit form, it came with batteries, display, and all components ready for soldering. Released as interest in personal tech grew, it prefigured later calculator watches and reflected demand for compact computing tools.<\/span><\/span>\u00a0<\/span><\/p><\/div><\/div><\/div><\/div>\n

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