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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 (Part 1) was ''' is primarily a '''rom box''' for the CPC series, but had additional features:
* Special non-standard Buffered Expansion Port (with pre-decoded IOSEL line, on access to "free" I/O addresssaddress)
* Lightpen socket (3.5mm stereo socket - just a connector with LPEN,5V,GND - without any additional electronics)
The DIY project consisted of '''Amstrad Expansion System (Part 2)''' adds some more features: * 6x8bit I/O port (using two [[8255 PPI chip]]s)* Additional power-supply module (PSU) == Technical == ROM is selected using an I/O port decoded with A15=1, A13=0. The ROM number is decoded using D3-D0 only, meaning a maximum of 16 page instruction leafletROMs can be used, but the PCB only has 8 sockets available.In addition more then one value can select the same ROM.
== Pictures ==
Image:ROMBOX_04_MANUAL.JPG|ROM Box and photocopy of how-to build manual
Image:ROMBOX_05_SCREEN.JPG|Connected showing ROMs
Image:Maplin_ROMBoard_PCB_Top_(1).jpg|PCB Top (1)
Image:Maplin_ROMBoard_PCB_Bottom_(1).jpg|PCB Bottom (1)
Image:Maplin_ROMBoard_PCB_Top_(2).jpg|PCB Top (2)
Image:Maplin_ROMBoard_PCB_Bottom_(2).jpg|PCB Bottom (2)
</gallery>
* [[Media:Maplin ROM-Box Manual.pdf|Amstrad Expansion System Part 1: Maplin ROM-Box Manual]] (pdf)
* [[Media:Maplins Amstrad Expansion System Part 2 (Project Book19).pdf|Amstrad Expansion System Part 2: 6x8bit I/O Port]] (pdf)
== 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 CPC and Z80 Computers. Gives full instructions on how to build it with board layout and list of components.
== Weblinks ==
* [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]]
