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If you are refering to Chinese abacus their earliest rudimentary design of abacus has 1/4 rod beads (quite similar to the later Japanese soroban abacus). Various other types of abacus design were also seen afterwards, but the advance type of 2/5 rod beads became standard and classic. Afterwards, the basic 1/5 rod beads particularly became the type of basic design. The Roman abacus may be not connected to the Chinese abacus.
1.Abacus 2.Pascals Adding machine 2.Difference Engine 3.Analytical engine above were earliest computing devices.
China invented the abacus .
yes wash dose have 2 meanings
How did the abacus occur?
The Chinese abacus
An Abacus has beads and strings.
ABACUS
it is the abacus. :D :D :D i got is dummies
The abacus II!
the Chinese invented the abacus
the invenor of the abacus is the invenor of me