![Abacus, precursor of the computer, still in use, invention during Yuan dynasty 1279-1368, Hong Kong, China, Asia Stock Photo - Alamy Abacus, precursor of the computer, still in use, invention during Yuan dynasty 1279-1368, Hong Kong, China, Asia Stock Photo - Alamy](https://c8.alamy.com/comp/B2BTY5/abacus-precursor-of-the-computer-still-in-use-invention-during-yuan-B2BTY5.jpg)
Abacus, precursor of the computer, still in use, invention during Yuan dynasty 1279-1368, Hong Kong, China, Asia Stock Photo - Alamy
![ABACUS. The history of abacus can date back to 600 BC. During the period of Eastern Han Dynasty (25~220), the abacus was… | Abacus, Computer history, Old computers ABACUS. The history of abacus can date back to 600 BC. During the period of Eastern Han Dynasty (25~220), the abacus was… | Abacus, Computer history, Old computers](https://i.pinimg.com/1200x/cd/0e/47/cd0e47bf1202df9ec39d697b42e3fac2.jpg)
ABACUS. The history of abacus can date back to 600 BC. During the period of Eastern Han Dynasty (25~220), the abacus was… | Abacus, Computer history, Old computers
![Abacus computer with wooden frame. a text "rokus-klett" should be engraved on the wooden frame of the abacus. this would be an example of a gift that the company would give away Abacus computer with wooden frame. a text "rokus-klett" should be engraved on the wooden frame of the abacus. this would be an example of a gift that the company would give away](https://pics.craiyon.com/2023-06-29/1a3fe9a4dd6946baa5dcd46e773250a1.webp)