How do I make Retroarch use a different version of Mame or Reicast for select games

[scoobydooami]

Hi.  I do not know what I should put in the command line under emulation to make Retroarch use a specific version of Mame or even Reicast rather than the version I have set for all games.

I tried -L "cores \ reicast_libretro.dll" under that game's emulation tab under *Use custom commandline parameters* as an example for an Atomiswave game.  The game does work in Retroarch standalone if I select Reicast (I have necessary bios and so forth), so I just cannot figure out what to put to make Launchbox use it.

I don't know much about the command line so am unsure what I should be entering.

Any help appreciated.

[Lordmonkus]

29 minutes ago, scoobydooami said:

 -L "cores \ reicast_libretro.dll"

Is that a direct copy / paste from your command line ?

If so it has 2 spaces in it that is causing it to not work.

-L "cores\reicast_libretro.dll"

Copy and paste that in and it should work if you have the reicast core in your cores folder.

[scoobydooami]

8 hours ago, Lordmonkus said:

Is that a direct copy / paste from your command line ?

If so it has 2 spaces in it that is causing it to not work.

-L "cores\reicast_libretro.dll"

Copy and paste that in and it should work if you have the reicast core in your cores folder.

That's it!  Thank you very much!.  This has been so helpful.  I have some games including non-mame where I want to use a different retroarch core and now knowing the syntax is VERY helpful.

[Lordmonkus]

Another tip if you want is to create a 2nd or more entries of an emulator and setup the associated platforms with alternate cores. That way you can quickly pick the emulator entry from the list rather than fill in the command line.

If it's just a few games you may not want to clutter up the emulator list but if you want to do a whole bunch of custom ones then the emulator entries saves time.

You don't need to setup separate installs wasting drive space, it's a new entry in LB pointing to the same emulator install.

[scoobydooami]

3 hours ago, Lordmonkus said:

Another tip if you want is to create a 2nd or more entries of an emulator and setup the associated platforms with alternate cores. That way you can quickly pick the emulator entry from the list rather than fill in the command line.

If it's just a few games you may not want to clutter up the emulator list but if you want to do a whole bunch of custom ones then the emulator entries saves time.

You don't need to setup separate installs wasting drive space, it's a new entry in LB pointing to the same emulator install.

Thank you.  I think I understand. So, I added a 2nd listing for Arcade under Tools/Manage Emulators/Retroarch.  I selected flycast (I hadn't realized there was the new one).  If I right click on a game (example: Dolphin Blue) and select Retroarch/flycast it works perfectly. It also works fine if I am in retroarch and select flycast, however, if I use the commandline as above, it just goes to the Dreamcast screen where it asks me to load file or disc.  The same applies to the reicast core.

Any idea why that would happen?  Other games like Sushi Bar work directly from Launchbox.  Maybe it's because it's Atomiswave?

 

 

Edited July 31, 2019 by scoobydooami