1. Parallel Printer Adapters: These adapt the parallel communication interface used by computers to the serial port used by most printers.

2. Serial Printer Adapters: These are used to connect a serial port computer to a printer that has a parallel port.

3. USB to Printer Adapters: These are USB toParallel or USB to Serial printer adapters that allow a computer to connect USB devices to a printer with a parallel or serial port.

4. Wireless Printer Adapters: These devices allow a printer to be used with a wireless network.