Back in the early 90's, I worked for a company that made parking meters. The big yellow kind with displays and buttons. We sent TRS80 Model 102's to customers

Back in the early 90's, I worked for a company that made parking meters. The big yellow kind with displays and buttons. We sent TRS80 Model 102's to customers for editing rates and messages and uploading them into the meters. It was my job to reverse engineer the protocols and rewrite the software for DOS so that it could be used on portables like the HP 200LX. A few years later we rewrote it again for Windows. I'd love to believe that there's still customers out there using the TRS or HP to manage their parking meters.