An alternative to these devices was the reckoning board.  
Some scholars contend that the Darius Vase and Salamis Tablet show Greek knowledge of these devices.  An impractical one of these devices for daily use was popularized in Europe by Gerbert d'Aurillac, the future Pope Sylvester II.  Currency reforms in Muscovy in the 1530s may have prompted the development of one of these devices known as the schety.  One of the differences between the suanpan and soroban or Chinese and Japanese versions of these devices is the number of (*) rows that they have, and how they divide the upper and lower parts of the frame.  An alternative to these devices was the reckoning board.  The Romans used base-10 versions of these devices.  They generally consist of beads connected to wooden rods.  For 10 points, name these types of analog calculators.
Some scholars contend that the Darius Vase and Salamis Tablet show Greek knowledge of these devices.  
abacus