Tcl-based Incan Abacus emulator
Tk-Yupana is a simple program written in tcl / tk that emulates the operation of the abacus Incas pictured on p. 360 (363) El Primer Nueva Coronica y Buen Gobierno of Felipe Guaman Poma de Ayala.
It was created as a lightweight and open source tool that manages to implement the Burns Glynn algorithm.
The Incan Abacus, also known as the Yupana is an ancient calculating device of the Incas.
Glynn argued that the Yupana tablet is a calculator in base 10 with a space reserved for memory.
Operating system:Windows XP / Vista / 7
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Tk-Yupana 0.7.3 
