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In the current era, something like an abacus seems very basic and out of date. However, it is said that an abacus was the 1st computer..
In the future, technology that currently seems "cutting edge" might be looked on in the same way we look at an abacus nowadays.
Even a mobile phone from the late 20th Century already looks quite heavily dated...
This page features some tech which is already starting to look in between "slightly" and "quite heavily" dated...
The first smartphone was a fruit... but not an APPLE, a BLACKBERRY (well actually no, probably a Palm or Windows Mobile device..or maybe even a Psion - believe those had a SIM slot - or a Sony Vaio).
Nintendo made the first popular portable computer...???
But WALKMAN was there before the GAME BOY...
A handheld abacus was the 1st popular portable computer? Casio digital calculator? (although not the one below; it's far more recent...
