Hello, this is a RC767 Cartidge PCB view, yes, the Metal Gear 2 (Solid Snake) game, I opened the cartridge without any damage to konami case and original sticker, i want to add extra game versions (spanish, english, maybe Turbo Fix Version), with some ROM or FLASH IC´s, without extract original japanese ROM, the idea is install a logic circuit that allow change different game versions after Press RESET on the machine, each press of RESET should allow load a different game version instaled in new ROM´s. If no RESET is press the first game version that should load will be the original, i´m researching about the circuit, maybe this mod it was published in the past. I know the Solid Snake is 4Mbit ROM, then, if i´m right i´ll need 27C040 ROMS (4Mbit 512K), better will be use AT27C040 (512L PLCC version, more smaller), to use FLASH i think i´ll need AM29F040 (also PLCC version), for now i´m searching info how conect ROM or FLASH, i think ROM will be more easy. It´s only a project in mind for now, anyways any help will be wellcome. 
Another question in mind is to know if 2Mbit ROM pinout is the same for 4Mbit ROM pinout, i found only 2Mbit ROM pinout here:
http://bifi.msxnet.org/msxnet/tech/pinouts.txt
Apart from this, if you see the pcb cartidge, you´ll see like there is empty space to allow a 28 PIN EPROM and maybe any 14 PIN logic circuit to handle it, i´m wondering if anyone have information about Konami´s real purpose to build a pcb that way, a free space for logic device and free space for eprom or another IC. Maybe there is any special function that also could be added to this cartidge, i dont Know.
