Quick version: Do the rows and beads of a nepohualtzitzin directly correspond to the Mayan digits?
Long version: I'm working on a simulation of a nepohualtzitzin, which is a Mayan/Aztec abacus. I've been doing some independent research and learned the Mayan numerals and the base-20 system, and it seems to me that each row corresponds to a single numeral, and that the one's beads correspond to a dot, a five's bead is a line, and each row is a power of 20. Easy, right?
However, the material my client has provided insists that each row in the abacus is base-10, so that the beads and rows on the abacus don't match up with the numerals. Google isn't turning up anything useful in English to clarify, as most material is on its historical significance and relation to the calendar. This change is trivial for manual manipulation purposes, but it turns relatively simple logic into a nightmare when you take carrying and addition and multiplication into account. I need to know which is correct: my instinct or my documentation?