Soonjai: Didn´t know that such things are out there. And 161 semms to be almost every game for the system, or at least every game that is important. Sure, you can always go the MAME route like I did, but I just use that at home for myself and buddies and I´m not sure if he could get in trouble with the law if he chooses to built an MAMEcade for a public arcade / coffee shop buisiness, same goes for that multi cart. For home use I would get one for myself if I had an MVS, but I would not use it in a public shop unless I had something on paper from some sort of lawyer-type of person that gives me green light for using it.
It is a legal 'grey zone' allright - but coinop bootlegs have been in existence and in use almost as long as the original games themselves. Take a look at
arcadiabay.de, which have used games for sale, both original and bootleg pcb's.
Heck, even the pc based Sega Lindbergh and the Taito typeX1 and 2 have been bootlegged, hardware with security and software and all. Many arcades have no qualms using bootlegs. The software still runs on the hardware it was intended to.
I have been running two different versions of the yellow mvs multicarts myself, and they work without problems with all the variants of the mvs systems available. There's one
special cartridge that is connected to a daughterboard which only work on single slot systems with original bios (no unibios support).