Not so common anymore, but POS displays could be seen in every store. I made a small C# program that could interact with one of these displays through the COM port and show preconfigured text to the user. I know nothing about compatiblity with other vender models, but it work with my model and it was useful. Hopefully someone else could find this project useful as well.
January 02, 2015 Commit 9EF0C065 from 01-24-2017 - 1 edit total