Changes
typo
[[Image:Amstrad Expansion System.jpg|thumb|150px|Amstrad Expansion System]] == Description == The '''Amstrad Expansion System''' aka '''Maplin ROM BoxCard''' from [[Maplin]] is a DIY project by [[Dave Goodman]] and [[John Attfield]]. The '''Amstrad Expansion System (Part 1)''' 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 address)* Lightpen socket (3.5mm stereo socket - just a connector with LPEN,5V,GND - without any additional electronics) The '''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 ROMs can be used, but the PCB only has 8 sockets available.In addition more then one value can select the same ROM. == Pictures ==
<gallery>
Image:ROMBOX_02.JPG|ROM Box with ROMSROMs
Image:ROMBOX_03.JPG|ROM Box
Image:ROMBOX_04_MANUAL.JPG|ROM Box and photocopy of how-to build manual
Image:ROMBOX_05_SCREEN.JPG|Connected showing ROMSROMsImage: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>
[[Category:Expansion ROM]] [[Category:Peripherals]] [[Category:manual]]
