CPS2 consists of a main motherboard (the A board), the games are sold separately as a B board which connects with a compatible (motherboard) A board. Both the A and B boards are colour coded for a specific language/area. Blue ones in English (US & Europe), green in Japanese and grey in (Asia).

SUICIDE BATTERY. CPS2 games have a battery (Suicide battery) the average life span of this battery is around five to six years when it dies - the game is unusable (unless you send the board to the company Capcom to fix). CPS-2 boards sometimes have had the roms reprogrammed with unencrypted versions so they never have battery problems again or simply have the suicide battery removed. 

MVS.
The supergun is compatible with Neo-Geo slot one motherboards (mvs) that have a Neo-Geo controller input. Example: plug the supergun (with supergun control pads attached) into the Neo-Geo motherboard then plug the Neo-Geo controller into the motherboard as well. 

JAMMA AND OTHER ARCADE PCB CONVERSIONS.
If you buy a PCB arcade board that does not have a jamma output (Capcom; Namco, Taito; Sega System 16), you can buy an adapter to run the games on the supergun, example; conversion class: Capcom Classic - Ghosts 'n Goblins, Gun Smoke; Commando.