Hi, just to clarify:
Mame is an arcade emulator program u install on the pc to play old
arcade games. Each game come in the form of rom files
(each game can have its rom files all in one zip file).
So, first things first ...
U need to get a hold of the mame emulator, and install it,
then u need to get the 'R-Type' rom file/s to add into the emulator.
See if u can manage to google for the relevent bits.
pm me if u cant find wot u need.