* Project Number 18 - Amstrad Expansion System Part 1: an external ROM card system for the Amstrad (see [[Maplin ROM Box]])
* Project Number 19 - Amstrad Expansion System Part 2: describes the 6 x 8-bit parallel I/O Port and PSU Card(see [[Maplin ROM Box]], too.)
* Project Number 20 - [[Maplins 8bit Input Port|Amstrad 8 Bit Input Port]]