easyPOS is a GPL cash register written in C using GTK+ .

* easyPOS uses flat ascii text files for menu items and credit accounts. the menu structure is simply a directory tree: /menu with as many second level sub-directories as needed: /cooked, /dessert, /mdse, etc. each of these contain actual menu items with prices.

* easyPOS stores each ticket with detail in another tree: /slips. a typical entry would be: /slips/2001/Jun/15. this sub-directory would contain all the tickets for the day, both cash and charge. because all detail is kept, you can get full inventory control information on a daily basis. an export file is written at the end of the day with item summary information.

* easyPOS uses "standard" POS hardware. the slip printer is attached to the parallel port and is fed by standard lpr commands. the cash drawer connects to a port on the slip printer which is pulsed to open the solenoid door lock when you send an ascii bel to the printer. opening the drawer consists of sending a file that contains only an ascii 7 to the printer.