Wes says it's $500 dollars, nvjack says it's 500 credits?

So here's what I'm vaguely understanding, please correct me.

The New machine has the cylinder for payouts. Pays out based on a Bar-Bar-Silver Strike, or 2bar, 2bar, SS or 3bars, 3bars, SS.

Old converted machine, is retrofitted to have the cylinder dispenser and the new payout wheel system matching the New Machine. In the old machine case?

Old machine, is... the old machine.