Glad you asked! The PSX is one of the aforementioned difficult cores that we've actually started working on (which is why you'll see it talked about so much). Work is underway by the RetroArch devs to add a dynamic recompiler (dynarec) to Beetle PSX, which allows instructions to be translated ahead of time from the PSX's native MIPS architecture to the native format of whatever platform is doing the emulation. This eliminates a lot of emulation overhead and makes for. Once a dynarec is ready for conventional platforms (like PC and smartphones) work can begin on one for PowerPC, the type of CPU the Wii U uses.Dynarecs, however, are very complex pieces of software, and take time and knowledge of both the PSX and target platform to write. To aid motivation, the community has set up bounties. It's advisable to stay out of the bounties' comment sections: they're meant for development discussion and support of the project, but there's been some high emotions lately and concerns are being voiced about scaring off developers.In any case, here's a link to the bounty for a dynarec on PCs and smartphones , and here's a separate bounty for the Wii U specifically . If you want to see full-speed PSX emulation on these platforms, why not throw in a few dollars to show your support?