My son is a computer whiz who says it was common knowledge among geeks that the machines were eminently hackable, either locally or centrally i.e. most of the machines in the country could be altered from a single location by a technique called proportional voting or proportional scoring. He says frustration of the hack was worked but many computer whizzes like himself only better at it who worked hard to block it. He says he started to get into it but better geeks than him were on it and he stayed out of it.
Not true. There are many different kinds of voting machines in use, most of which have no internet connection or any means of access other than physical contact. The run widely different code bases, and for a lot of machines the code they are running is in ancient EPROM memory that can only be updated by being erased with UV light and then reprogrammed.