These Plessey dot-matrix displays are a perfect example ... Each 8-pin DIP has two 5×7-matrix, high-visibility LED displays. They bear date codes from the late 80s under the part number, GPD340 ...

But what if you could make your card stand out from the rest? By using a 5×15 LED matrix screen, a single micro controller, a number of resistors, switches, and other parts, [tomward] has put ...