But for PC Engine CD, although I use command line, --system pce --fullscreen, it launches Mega CD emulator. Does anybody know the abbreviation for each system, or the correct command line I should use? I found no information about it, just: a26, fc, sfc, n64, sg, ms, md, ps1, pce, ng, msx, cv, gb, gba, ws, ngp, spec, and some do not work.