Editing Acorn Archimedes A4000 (section)

== Ports and expansion ==

The rear panel carries, from left to right, the keyboard socket, a parallel printer port, a serial (RS232) port, an Econet socket (usually not fitted), a headphone socket and the analogue RGB video output, with the separate power supply at the left of the panel.<ref name="chris" /> The video connector is a 15-pin VGA-style socket carrying analogue RGB.<ref name="classic" />

Internally the A4000 has one mini-podule expansion slot, the same single-slot arrangement as the A3010 and A3020, plus a network-interface slot for an Econet or Ethernet module.<ref name="chris" /><ref name="classic" /> Common additions were an Ethernet mini-podule and a RAM upgrade board.<ref name="chris" />