It's honestly impressive how well Motorola 68000 assembly is both A) able to be manually reversed into C-like code, and B) understandable, even having never touched 68k ASM before in my life.
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The CDIC comprises a gate array, an ADPCM decoder IC, a DSP IC, and 8192x16bits of SRAM, and is wholly undocumented. It's now emulated well enough that most non-MPEG CD-i games work fine, but there are stragglers, and I don't want to push until they all have working audio.
The thing that's not been going well is trying to intuit a set of behaviors that make all games equally happy based on pure observation of accesses to the chip itself; I figure by being able to know how all of the OS functions fit together, I'll have a better picture of it all.