Found this dump I made a while ago, it's probably not going to be emulatable any time soon (there might be some kind of mask ROM BIOS too), it's from a 788 in 1 console similar to
this. Looking inside the string "SPF2ALP" appears many times which is a hallmark of a Generalplus/Sunplus system (it's from their sound converter tool), and the code inside seems to be for their unSP arch. I think this is running off one of the newer Generalplus microcontrollers but I'm not certain.
You can find some intact WAV files (with metadata) inside, as a little curiosity.
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