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The '''Amstrad Expansion System''' aka '''Maplin ROM Card''' from [[Maplin]] is a DIY project by [[Dave Goodman]] and [[John Attfield]].

The '''Amstrad Expansion System was (Part 1)''' is primarily a '''rom box''' for the CPC series, but had additional features:

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* 128 Special non- 8bit standard Buffered Expansion Port (with pre-decoded IOSEL line, on access to "free" I/O port.address)* 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.'''Amstrad Expansion System (Part 2)''' adds some more features:

== Maplin'* 6x8bit I/O port (using two [[8255 PPI chip]]s Amstrad Projects ==)* Additional power-supply module (PSU)

* MAPLIN PROJECTS BOOK 18 - Amstrad Expansion System Part ROM is selected using an I/O port decoded with A15=1: an external , A13=0. The ROM card system for the Amstrad* MAPLIN PROJECTS BOOK 19 number is decoded using D3- Amstrad Expansion System Part 2: describes D0 only, meaning a maximum of 16 ROMs can be used, but the 6 x PCB only has 8-bit parallel I/O Port and PSU Cardsockets available.* MAPLIN PROJECTS BOOK 20 - Amstrad 8 Bit Input PortIn addition more then one value can select the same ROM.

* [[Media:Maplin ROM-Box Manual.pdf|Amstrad Expansion System Part 1: Maplin ROM-Box Manual]] (pdf)* http[[Media://www.maplinMaplins Amstrad Expansion System Part 2 (Project Book19).co.ukpdf|Amstrad Expansion System Part 2: 6x8bit I/ O Port]] (pdf)

Unclear if above manual covers both Part 1 and Part 2 == Additional == * [[Media:Maplin Video Digitiser.pdf| Maplin Video Digitiser DIY Kit Article]] (pdf)"Electronics - The Maplin Magazine" Dec 1985-Nov 1986. Published by Maplin Electronic Supplies Ltd. Page 12 - 18; Video Digitiser. This DIY Kit could be assembled for use in the Buffered Eurocard Extension board of the Maplin ROM Box for use with Amstrad Expansion System project (?)CPC and Z80 Computers. Gives full instructions on how to build it with board layout and list of components.

* [http://en.wikipedia.org/wiki/Eurocard Info on EURO-card standard]* http://www.maplin.co.uk

[[Category:Memory expansions]] [[Category:HardwareExpansion ROM]] [[Category:Peripherals]] [[Category:manual]]