Hi, do you mean any homebrew games that support Arcade Card?
Although how the hardware works is pretty well understood,
I don't think it is supported by any homebrew games...
I used my ROM emulator to run my hes code on the real PCE.
Please also see here:
www.geocities.jp/team_zero_three/RomEmu/rome.html
I used "TurboROM" board to connect my rom emulator to PCE.
But this board is probably not available.
Next option would be to connect your ROM/ROM emulator via the EXT bus.
It's not very easy to run your code on the real PCE...
Hello! That is a very cool project you have going there! I'm very interested in writing music with a PC-Engine, so how did you go about playing your .HES on an actual PC-Engine? Thanks in advance!