Hello!
A while back, I made a processor definition module for Ghidra that supports both the NEC V810 and V830 architectures. Even though the v810 is relatively more well known as the CPU used in the Virtual Boy and the PC-FX, this module started as one exclusively for the v830 since I have a car navigation radio made by Alpine for a 2007 Dodge Durango that used a v833 CPU. Its DVD had elf files with symbols which I wanted to decompile, and I can confidently say they decompile successfully with the module. Eventually I figured that it would benefit the Virtual Boy and PC-FX communities more if I included v810 support as well, hence it now includes both. I'd be interested to find out about any more electronics that use either of these CPU architectures!