We all love to use our old joysticks like the Competition PRO with our retro hardware, but to be honest, sometimes we wish to use a more modern input device like an XboX controller, don’t we? Impossible? No! Duke, also author of the great M4 WiFi interface for the Amstrad CPC, has designed a device, called Imperium Solo, that allows you to connect your modern game controller to the Amstrad CPC and play your games with it. It already supports a variety of USB input devices (like the already mentioned XboX controller or a USB NES gamepad), but the firmware is constantly improved by Duke to support even more input devices.
You can get more information and the latest firmware on Dukes Imperium Solo web page and discuss and order it in the CPC Wiki forums.
After years of inactivity I decided to release two old project, which I started to work on in 2010, publicly on my GitHub account. I have not produced any prototypes yet, so they are currently more a draft. Both projects use a flash EPROM to store the data in the cartridge. The first one is a simple Amstrad Plus / Amstrad GX4000 cartridge, which can be equipped with an original ACID protection chip or with a Xilinx XC9536 CPLD for ACID emulation (you can read more about the emulation here).
The second project is the design of a flash cartridge, which can be programmed on a PC via USB and used in a Amstrad Plus / Amstrad GX4000. You can read more about the design in the README.md.
Maybe someone with more time is interested to take over the projects, otherwise I will work on them every now and then…