Casio, Seiko Pioneered Smartwatches in 1983-84 With 10 Contacts and 2KB Memory

1 articles · Updated · Boy Genius Report · May 12

1983’s Casio Databank CD-40 and 1984’s Seiko RC-1000 emerged as early smartwatches, moving beyond novelty by storing contacts, reminders and other personal data on the wrist.
The CD-40 held 10 phone numbers and added a calculator, alarm and stopwatch, while Seiko’s RC-1000 packed 2KB of memory and linked to IBM PC, Apple II and Commodore 64 machines.
Seiko said the RC-1000 could transfer and store data in 10 seconds, keeping 80 screens of information with up to 24 characters each—effectively a wrist-worn organizer.
Adoption was limited by cumbersome design: users loaded floppy-disk software, connected the watch by cord and navigated tiny displays, while Casio’s miniature keypad made entering names slow and error-prone.
That friction helps explain why modern devices took off later, with watches like Apple Watch and Pixel Watch offering app-based interfaces, software updates and vastly larger storage—32GB versus the RC-1000’s 2KB.

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