@mitu thanks for replying .I was trying to get the x68k emulator swap-disks to work rather than the retroarch's . its odd that there are not any info about it on the internet! it got to be a common issue. anyways I gave up :) its seems retroarch is a much easier option now.
thanks again.your guides on this website helped me alot with the whole retropie/launchbox thing . I appreciate it.