I worked on a touch-screen gas pump terminal back in the late 90s. Was under a contract with a gas stations owner that did the numbers and realized that paying

I worked on a touch-screen gas pump terminal back in the late 90s. Was under a contract with a gas stations owner that did the numbers and realized that paying for a terminal will be less than what he was losing to the employee theft. The terminal had a receptical for paper money, which was a crazy expensive thing back then, a massive touch screen (late 90s mind you!) and was hooked up to the internet through an X.29 modem. The pumps were controlled via a serial cable using a protocol that was documented just with a phone number of a guy who knew the details. Duck-taped the whole thing together, showed it off to the guy, he paid the balance in cash and then it was passed to the deployment guys, where it remained for a couple of years, because the client was assasinated (but lived) and had a subsequent change in life priorities. Fun times. The stack was Windows NT.