``` A B A C U S A S A H E X A - D E C I M A L C A L C U L A T O R ===================================================================== The Chinese Abacus has two beads in the upper rows and five beads in the lower rows. One upper bead is equivalent to "5" and one lower bead is equivalent to "1". For representation of the decimals 0...9 only one "5" and four "1" beads are necessary in an Abacus ... ... BUT - The full Abacus can be used for HEXA-DECIMAL Calculations: To enter a number shift the beads towards the inner wooden bar... Example: 0123,4567.89AB,CDEF in a 64-BIT-WORD is represented: +---------------------------------+ | o o o o o o o o o o . . . . . . | | o o o o o o . . . . . . . . . . | | . . . . . . . . . . o o o o o o | | . . . . . . o o o o o o o o o o | |=================================| | . o o o o o o o o o . o o o o o | | . . o o o o . o o o . . o o o o | | o . . o o o . . o o o . . o o o | | o o . . o o o . . o o o . . o o | | o o o . . o o o . o o o o . . o | | o o o o . . o o o . o o o o . . | | o o o o . . o o o . o o o o o . | +---------------------------------+ 0 1 2 3 4 5 6 7 8 9 A B C D E F HOW TO USE the ABACUS for all: Add, Subtract, Multiply, Divide ===================================================================== CLICK HERE ... impressum: ********************************************************************* © C.HAMANN http://public.beuth-hochschule.de/~hamann 1st April 2009 ```