Metal Slug 2 Turbo@18MHz (Arcade) 1CC speedrun in
Played on NeoGeo MV-1FZS board, overclocked from 12MHz to 18MHz and game cart patched with the Turbo patch: http://blog.system11.org/?p=1442
This is the fastest possible way to play Metal Slug 2 on real hardware. To replicate the setup in MAME, use mslug2t ROM, enable cheats (to allow overclocking) and set CPU speed to 150%.
As to why, see this video of the original game: • METAL SLUG 2 - "ALL SECRETS" Speed RuN