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[[Image:Inside GX4000 cart 1.jpg|frame|right|ACID protection chip within a cartridge (bottom)]]
The '''ACID ''' (Amstrad Cartridge Identification Device'''A'''mstrad '''C'''artridge '''I'''dentification '''D'''evice) protection chip is used in the [[GX4000 cartridge|cartridges ]] of the [[Plus ]] series and the [[GX4000 ]] game console. Because this chip is a custom creation by Amstrad it is currently not possible to replace this chip nor to build new cartridges, because it is unknown how it works. It is labeled with "Amstrad 40908".
