The system BIOS files should be placed in "/home/pi/.openMSX/share/systemroms/". At the very least, you should have msx2.rom and ms2ext.rom in this directory. These and other BIOS ROMs can be downloaded from Marat Fayzullin's site at http://fms.komkon.org/fMSX/
If you're using EmulationStation, you can add the following lines to your es_systems.cfg file to add MSX/MSX2 support:
- Code: Select all
EXTENSION=.rom .ROM .mx2 .MX2 .mx1 .MX1
COMMAND=openmsx -cart %ROM%
Last but not least, compiled binaries for OpenMSX are located below.