这哪里是机械计算器……，作者的原话
i have made an "electronic" 8bit calculator (not "mechanical" calculator) with the Beta demo of "Little big planet" (a new PS3 game with an editor for create).
it do decimal/binary conversions and it can do Add and Sub.
There are probably more simple solutions for calculator machine but i was more interested by this "electronic" solution for the fun

computation take clearly less that a half second
this calculator use:
- 610 magnetic switches
- 500 Wires
- 430 pistons
- 70 emitters
and others stuff...