At my old job the food and beverage department used IBM POS. I'm pretty sure it was touch screen but seemed to also have some extra detection from the screen ed

At my old job the food and beverage department used IBM POS. I'm pretty sure it was touch screen but seemed to also have some extra detection from the screen edges. One day a fly landed on the screen and managed to enter an order for a sandwich and two bottles of pop. Talk about a bug!