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The '''Amstrad Expansion System''' aka '''Maplin ROM Card''' is a DIY project by [[Dave Goodman]] and [[John Attfield]].
The Amstrad Expansion System (Part 1) was primarily a '''rom box''' for the CPC series, but had additional features:
* 128 Special non- 8bit standard Buffered Expansion Port (with pre-decoded IOSEL line, on access to "free" I/O port.addresss)* Motherboard extension plug for EURO-card modulesLightpen socket (3.5mm stereo socket - just a connector with LPEN,5V,GND - without any additional electronics)
The DIY project consisted of a 16 page instruction leaflet.
