AES cartridges and MVS cartridges are made of two, dual layer boards. Chips facing upwards, the top PROG board holds the P ROMs (68k code) and V ROMs (sound samples), while the bottom CHA board holds the C ROMs (sprite tiles), S ROMs (fix tiles) and M ROM ROM (z80 code).
Various cartridge boards were designed over the years to accomodate different ROM chips and protection chips. See cartridge specifications for a complete list of them.
EPROM and JEIDA flash carts by SNK. Capacity ? Versions ? Pictures ?