Moving mame engine sets between two Pi4?

[Johan Sjöblom]

Hi picochess group

I wonder if Randy, or someone could help me understand. I successfully copied a set of engines from a Trixie based Pi4 to a Bookwork Pi4. For some reason I had to avoid copying the entire mame_emulation folder. I had to do the following steps instead to get the mame engines to work on my old Pi4 bookworm. Both Pi4 had mess (mame) version 0.279.

1. I copied everything from /opt/picochess/engines, but not the mame_emulation folder.

2. I copied the roms and hash libraries, and then all mame engines started to work.

3. For the artwork I also copied the artwork folder.

The other mame_emulation folders I did not touch, I left them as the original image had.

Shouldn't the mame_emulation folder copying work from Pi4 to Pi4? Maybe I just made some silly mistake... Made me wonder though, what the correct way is to move a set of engines from one Pi to another...

-- Johan

[Randy Reade]

As long as mess is compiled with the same compiler version (or specifically glibc version) it should work going from Trixie to Bookworm by copying the mame_emulation folder, including roms, and updating retro.ini on the Bookworm installation. It's easy to test by using the command line. Just run (e.g., via ssh):

DISPLAY=:0 ./mess -video none -plugin chessengine mm5

from the mame_emulation folder.

Randy

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