To enable cheatmode type "delboy" at title screen.
Another effect of the cheatmode besides the actual cheat is that after enabling it so is "Martin Ward" mentioned for programming credits instead for "Elite Systems" at title screen? You can compare yourself by checking the 2nd and 5th screenshot in this entry.
Awards:Golden Joystick Awards: Arcade style game of the year runner-up 1986
OriginsBased on Capcom 1985 coin-op.