My first use of the TRS-80 was a model 100 that was at our McDonald's. It ran a custom program called McBin that was supposed to help manage the quantity of the different sandwiches that you put into the "bin" which was a heated compartment with eight or ten slides to hold food which was prepared in advance during busy periods.

The McBin was basically useless, but I always set it up heading into a lunch or dinner rush because it meant I got to play with the TRS-80.