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Go and puncy one ande then se what hapens to your hand and then blame the abacus
An Abacus has beads and strings.
Possibly minus 1, along with mechanical desk calculators. Generation 0 would then be programmable electromechanical computers like the Harvard Mark 1 and Zuse Z-3. Then the normal generation numbering starts with electronics.
ABACUS is a name of a calculating apparatus - it is not an acronym.
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.