Difference between revisions of "Maplin ROM Box"
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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''' aka '''Maplin ROM Card''' from [[Maplin]] is a DIY project by [[Dave Goodman]] and [[John Attfield]]. | ||
| − | The Amstrad Expansion System (Part 1) | + | 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 addresss) | * Special non-standard Buffered Expansion Port (with pre-decoded IOSEL line, on access to "free" I/O addresss) | ||
* Lightpen socket (3.5mm stereo socket - just a connector with LPEN,5V,GND - without any additional electronics) | * Lightpen socket (3.5mm stereo socket - just a connector with LPEN,5V,GND - without any additional electronics) | ||
| − | The | + | 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) | ||
== Pictures == | == Pictures == | ||
Revision as of 15:31, 23 August 2010
Contents
Description
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) 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 addresss)
- 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 chips)
- Additional power-supply module (PSU)
Pictures
ROM Box with ROMs
ROM Box
ROM Box and photocopy of how-to build manual
Connected showing ROMs
Manual
- Amstrad Expansion System Part 1: Maplin ROM-Box Manual (pdf)
- Amstrad Expansion System Part 2: 6x8bit I/O Port (pdf)
