They do, absurdly enough. See for example BSNES, https://byuu.org/ , here's a quote from their most recent release notes: "If the coprocessor firmware is missing, bsnes will fallback on HLE where it is supported, which is everything other than SD Gundam GX and the two Hayazashi Nidan Morita Shougi games."
See past HN submissions about the extreme lengths BSNES goes to in order to get this data: https://news.ycombinator.com/item?id=3675123 , "In order to extract these programs from most of the DSPs, we had to decap the chips, scan them in with an electron microscope, and 'tweak' the processors to allow us to dump their protected program ROMs."
See past HN submissions about the extreme lengths BSNES goes to in order to get this data: https://news.ycombinator.com/item?id=3675123 , "In order to extract these programs from most of the DSPs, we had to decap the chips, scan them in with an electron microscope, and 'tweak' the processors to allow us to dump their protected program ROMs."