A cartridge system was introduced with the launch of the CPC+ series.
This enabled developers to distribute games via cartridges on the new Amstrad. The cartridges are protected by the ACID chip.
Technical specs.
A device to hack + cartridges
Vieuxzordiland's page on the matter. In French
Pictures
Pages in category "Cartridges"
The following 47 pages are in this category, out of 47 total.