Local copy of instructions in case it disappears from the internet

Abbreviated useful instructions from instruction video: https://www.youtube.com/watch?v=2mOW_ukZI7c

Boot with empty SD card, press all four buttons for 1 second - will show ROM errors but will create folders on SD card. Now put roms on SD card in newly created folders. SD Card must be actually empty, doesn't work if has files on it (reformat to fat32)
press and hold all four triggers for 1 second, release: switch game
press and hold all four triggers for 5 seconds, relase: enter menu - per game settings including hide or default games
Supports a rumble kit - requires a controller mod and based on xbox 360 rumble parts. Says they sell it at arcadeshop but I couldn't find it
Supports a subwoofer header - but not discussed or talked about other than "it sounds better" inferring they have it installed
Battle Zone II - new rom for "red zone" pcb that they sell. Can't find this ROM online - its embedded in the vectorwars ROM/firmware
Volume is controlled in game menu - no longer on PCB pot