Peripherals
Standard controllers
The GX4000 controller is similar to popular 8-bit gamepads of the time such as those for the Sega Master System, and NES. It contains only two buttons on the actual pad with the pause button located on the console itself, and uses the prevailing de facto standard Atari-style 9-pin connector.
Analog Joysticks
The GX4000 supports the use of analog controllers through its specific IBM standard analog controller port. The controller was not widely supported by software.
Lightguns
The GX4000 supports the use of a lightgun through its dedicated RJ11 lightgun connector. Multiple 3rd party Lightguns were available, and official releases supported this peripheral.
Read more about this topic: Amstrad GX4000