It just amazes me that we keep inventing new voting machines. Where I live, we've used optical scanners - you "fill in" the gap between two sections of an arrow for a candidate or the "Yes"/"No" ovals in the voting booth. You go to the machines and slide your ballot in. If you made mistakes (i.e. "outside the lines") or something's wrong with the ballot, it gets spit out immediately to let you correct it. You also get a receipt, if you want, showing your vote.

This is, at most, 1980s tech at work here.