I'm really trying to wrap my head around this... Is it software for the ATM? You do know, most ATM's have software built in already right? What does this software do separately that the standard software does not? What advantages do I have over using this software vs. using the stock software?
Nope.The ATM's I suppose come with a PLC that is Programmable Logic Controllers if not CPU's.Any company can manufacture just a machine which can be made to do various tasks depending on the program that controls it.I don't think that you should waste time selling Bitcoin ATM software since you can actually gain profit if it is really functioning you can be a millionaire thou, next time you invent is the HARDWARE of ATM, then you can use BOTH. 
There Should be detailed Specifications.
That is plain stupid if you mean he is wasting time making a Hardware to function to it's fullest.Maybe he doesn't want to be a millionaire ? There Should be detailed Specifications.