[LocutusOfBorges]

> not quite as exciting as extra CPUs

Not that it was an official licensed product, but for what it's worth, there was a DS flashcart that bundled a significantly faster CPU than the DS's own - the SuperCard DSTWO [1]. The extra CPU (Ingenic Jz4740, MIPS) was primarily used for GBA emulation on DS/DSi systems without the need for a GBA slot passthrough flashcart, as was otherwise required - though there was a quite successful homebrew scene around it at the time as well, up to and including stuff like a (proof of concept) port of a PS1 emulator [2].

It was a surprisingly impressive device! The only downsides, as I recall, were the increased battery drain and the fact that the DS Slot-1 bus was only fast enough to allow streaming video output from the cartridge to the system's displays at ~45FPS, irrespective of the rate that the emulator was actually running at internally.

[1] https://wiki.gbatemp.net/wiki/SuperCard_DSTWO [2] https://gbatemp.net/threads/how-to-play-ps1-games-on-your-ds...

[RainaRelanah]

Still have my DSTWO. Heat was an annoying issue too. But for the longest time it was the only way to play SNES/GBA even on the 3DS.