@TheMogMiner I read what you wrote about CD-i emulation and the difficulties faced; but my eye as drawn to you mentioning no dump for certain variants, etc. Are you sourcing them/trying to get them decapped or can the DU/me chip in cash or something?
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Some players are straightforward enough: A Philips SCC68070 (68k-derivative SoC), a Motorola DSP56k for audio, a Motorola 68HC05 for I/O, and another for CD servo control. Some have the latter three components all rolled into one ASIC (IKAT).
Others have a middle ground, with I/O handled by a 68HC05, and CD control and audio rolled into another ASIC called CDIC. That's the model that MAME currently emulates, for better or for worse.
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With platforms like the NES, SNES, Megadrive and even later platforms, each game accesses the hardware in a different way, leading to more insight as to how the hardware works. When everything has to route through a system BIOS, you don't get that breadth of info.
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And that, really, is the problem with emulating the Philips CD-i: You can't derive any knowledge about the underlying hardware by throwing different games at it. You either make the BIOS happy, or you don't.
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