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[[Image:Inside GX4000 cart 1.jpg|frame|right|ACID protection chip within a cartridge (bottom)]]
The '''ACID''' ('''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 was a custom creation by Amstrad it is currently not possible to replace this chip nor to build new cartridges, because it is unknown not known how it works. It is labeled labelled with "Amstrad 40908".
