Changes

:binary button (binary abacus)

:binary button (binary abacus)

:hexadecimal button (hexadecimal abacus)

:hexadecimal button (hexadecimal abacus)

:customization-toolbar button

:customization-toolbar button

:stop button not shown

:stop button not shown

:select the number of beads on the bottom of the frame

:select the number of beads on the bottom of the frame

:select the multiplication factor of top beads (e.g., on the Chinese abacus, each top bead counts as 5× the value of a bottom bead on the same rod)

:select the multiplication factor of top beads (e.g., on the Chinese abacus, each top bead counts as 5× the value of a bottom bead on the same rod)

:select the base to determine the value of bottom beads across rods; this is 10 on most conventional abacuses, but 20 on the Mayan abacus and 2 on the binary abacus.

:select the base to determine the value of bottom beads across rods; this is 10 on most conventional abacuses, but 20 on the Mayan abacus, 16 on the hexadecimal abacus, and 2 on the binary abacus.

== How to use an abacus ==

== How to use an abacus ==