[Tutorial] CD-I Emulation in RetroPie via lr-mess (warning: slowdown, especially during FMV, but surprisingly playable)

[SuperFromND]

Figured I should necro-bump this thread with a bit of an update: since the Pi 4 is now officially supported by RetroPie as of 4.6 (even if it's only considered in a beta phase), I decided to test lr-mess with CD-i and I can confirm it now runs full-speed, at least with Hotel Mario. :)

I should note that I did overclock to 1.75ghz, but I don't think that is necessary to achieve fullspeed CD-i emulation in lr-mess (though I've yet to test without an overclock).

[DTEAM]

Another way to run CD-i (cdimono1) with MAME standalone (like MESS without Lr)

go in /opt/retropie/configs/cdimono1
open your emulators.cfg

add:

mame-CD-i= "/opt/retropie/emulators/mame/mame -c -autoframeskip cdimono1 -cdrm %ROM%"

To set your "Input (general)" and "Input(this Machine), follow step 10 and 11 of this Tutorial.
Tutorial: Handheld and Plug & Play systems with MAME

You can use .chd without specific MAME naming and without dummy file.