the version included in volume 1 of the "pc smash pack" collection appears to be a prototype version. the internal rom date says march 1989, and the product number is filled with zeroes. in the notes section of the rom header (at 0x1c8), there is the string, "a0115 sega_channel", whereas all other releases have that area filled with ascii space characters. the header is also only marked as being a japanese release, while all other versions are marked as japanese, us, and european.