Serial communication has been used by computers for many years, though not as widely used in today’s market. When most people refer to serial, they think of the DB9 cable. It is referred to as DB9 because it carries 9 pins within it. There is also DB25 in the serial family, though, which obviously carries 25 pins. DB9 was typically used for devices such as gamepads, mice, keyboards, or other such interface devices. DB25 was typically used for printers or related devices. Both types of adapters and adapters to convert one to the other are readily available here at FireFold. Take a look below and find the one to match your needs.