This will convert the four V roms of MS4 to the two V roms required by mame.
263-p1.bin 1048576 bytes 27e4def3
263-p2.bin 4194304 bytes fdb7aed8
263-m1.bin 65536 bytes 38ffad14
263-m1d.bin 65536 bytes 69fedba1
263-v1.bin 8388608 bytes b1a08c67
263-v2.bin 8388608 bytes 0040015b
263-c1.bin 8388608 bytes 6c2b0856
263-c2.bin 8388608 bytes c6035792
263-c3.bin 8388608 bytes 0721d112
263-c4.bin 8388608 bytes 6aa688dd
263-c5.bin 8388608 bytes 794bc2d6
263-c6.bin 8388608 bytes f85eae54
http://svenn.free.fr/ms4/ms4v.zip
to make your p1 like the one listed here use this patch http://members.odinsrage.com/iceworld/Ms4_p1.zip
as for those two m1, I dunno where to get them. There's also new encrypted kof2001 C roms and good P roms!! maybe Mr Rom can help