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The '''ACID''' (Amstrad Cartridge Identification Device) protection chip is used in the [[GX4000 cartridge|cartridges]] of the [[Plus]] series and the [[GX4000]] game console. After Nocash decrypted the internal algorithms it is possible to replace the protection chip with a complex programmable logic device (CPLD).

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* An ACID replacement using a Xilinx XC9536 CPLD and some [[Media:acid.vVerilog implementation of the ACID chip|Verilog Codecode]] based on nocash's reverse engineering work has been built by Ocotoate [[Octoate]] and [[Nilquader]].* Miguel Angel (aka mcleod_ideafix) has published all the info about his implementation of the ACID in a CPLD, verilog sources included [http://www.zxprojects.com/index.php/analisis-del-chip-acid/62-analisis-del-chip-acid-del-amstrad-cpcgx4000]* It's possible to use the CPC+ without ACID by exploiting a timing bug in the CPC+/GX4000-ASIC Chip. (Developed by [[Nilquader]])