Its time to remove the dust from your old DOS-operated PC, plug it in and let it rock'n roll! I remember myself how happy i was when i managed to control a PIC with serial interface using QBASIC... This instructable from Bhavyansh Mishra shows how to use QBASIC to control three 7-Segment displays using the parallel port. The circuit is basic and very simple to prototype on breadboard. So if you happen to have such an old PC, GO AHEAD!!!