 The machine's rear houses multiple I/O ports.These include two serial ports, a 25-pin parallel port, a VGA port with combined signals for a standard VGA monitor and sound (Amstrad monitor only), a speaker/headphone jack, and a 15 pin game port for a joystick.The motherboard includes a 16 bit ISA slot connected to a riser card, providing a total of two 16 bit ISA slots.