How I installed retroarch on SNESC. This is just a quick little tutorial to get started somewhere. I hope it helps some people.
1) Download the lastest cores from
https://ufile.io/d71r5
(main thread here:
https://www.reddit.com/r/miniSNES/comments/73nvd3/the_designated_snesnes_classic_modifications/)
2) Extract the file somewhere on your computer (not in Hakchi folder yet)
3) Go to the extracted folder (kmfdmanic-v2.5-nescsnesc-cores10-7-17) and navigate to the base core in folder "HMOD_Standard_Versions". The file is named "_km_retroarch_standard_snesc_10_7_17.hmod"
4) Copy this file to you Hakchi-Install-Directory in the folder "user_mods" along with other modules you want to use.
I just use a few
_km_genesis_plus_gx_10_5_17.hmod
for Sega Mega Drive and Master System
_km_mgba_gb_gbc_gba_9_30_17.hmod
for Gameboy, Gameboy Color & GBA
_km_nestopia_9_23_17.hmod
NES
_km_stella_9_17_17.hmod
Atari VCS 2600
5) If you now restart Hakchi2 the modules will be visible when you select MODULES -> INSTALL EXTRA MODULES. Just select and the kernel will be flashed (follow the instructions on the screen).
6) Now you can add several roms to the games folder and add coverart (exactly like you did with SNES roms). Unzip your roms and add them. Compression works fine with retroarch, but only with hakchi's internal compression, so the roms have to be unzipped when adding.
NOTE: It doesnt work quite good when you try to add coverart for non-snes-games automatically, I added them mostly by hand. Hakchis internal google search wasn't working as good as for the SNES games. The games folder will be a mess if you add many games. I already suggested columns for sorting the games window on github (then you can select games for one system at once). If you have a coverart file (.PNG or .JPG, maybe more formats are supported I don't know) in your roms-folder which is namend EXACTLY like the rom-file you just added, Hakchi will recognize it and add the cover automatically (nice thing!).
7) I recommend SETTINGS -> PAGES/FOLDER STRUCTURE -> CUSTOM.
8) Press "Synchronize selected games..." and connect your SNESC.
9) Now you can create different folders (for each system for example) and add nice icons. I never had problems having a large number of files in one folder.
Now connect your SNES mini to TV, reboot and enjoy your other systems on your device!