Amstrad Expansion System aka Maplin ROM Card
- MAPLIN PROJECTS BOOK 18 - Amstrad Expansion System Part 1: an external ROM card system for the Amstrad
- MAPLIN PROJECTS BOOK 19 - Amstrad Expansion System Part 2: describes the 6 x 8-bit parallel I/O Port and PSU Card
- MAPLIN PROJECTS BOOK 20 - Amstrad 8 Bit Input Port
Pictures
ROM Box with ROMs
ROM Box
ROM Box and photocopy of how-to build manual
Connected showing ROMs
Manual
Maplin ROM-Box Manual (pdf)