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Revision as of 20:52, 1 July 2017 by Codeasm (talk | contribs) (added source links, altho those arent 100% complete or correct (56K modems arent in the MCPX at all))
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The MCPX is the southbridge chip of the Xbox chipset by Nvidia. It contains the sound processors (APU and ACI) and also the USB, PCI, IDE, etc, controllers[1], [2].

The MCPX is also the home to the secret MCPX ROM.