I’m looking for the best cores to use for these systems:
Colecovision
Intellivision
Amiga CD 32
For the first two i’m currently using an older MESS core from 2015 but it’s not ideal. I would rather use a different core, like how i now use the Atari800 core for Atari 5200.
For the Amiga CD 32 i don’t know what core to use at all.
For the Intellivision, think only MAME/MESS.
The colecovision think it’s bluemsx, it’s not really that user friendly atm, you need to set the core to colecovision, quit RA and restart RA then it’ll work as a coleco emu, but then it won’t run MSX games without setting it up as a MSX exit reenter RA then you can use it as a MSX (same with SVI/SG-1000).
The Amiga CD32 don’t think there is one (there is Puae, but it’s WIP)
bluemsx doesn’t work correctly for colecovision in RA. You need to use MAME for that. MAME works fine, although the system is unusually demanding for 8bit.
Amiga CD32 has to be run in MAME. I haven’t tried it.
Bluemsx works correctly for colecovision in RA.
How do you setup BlueMSX?
I load the core and i see no core options. When i try to run a Colecovision rom, it crashes.
Try to copy Databases and Machines folders into your system folder if you’re missing those.
You can get them from a stand-alone BlueMsx package or from here in system/bluemsx folder. (don’t make a bluemsx folder in your system folder)
Still doesn’t work 
I also get some random files created in the root of the hard disk for some reason, like “MSX2+.cmos” and “Pac.sram”.
But it still won’t work.