*[http://www.cpctech.org.uk/docs/arn5new.html Asic and Plus features at Unofficial CPC ressources 1.4]
*[http://www.cpctech.org.uk/docs/arnold5a.html Asic and Plus features at Unofficial CPC ressources 1.5]
*[http://www.cpctech.org.uk/docs/cpcplus.html Extra Plus Hardware Information]
*[http://quasar.cpcscene.net/doku.php?id=assem:asic Quasar ASIC documentation (in french)]