Dungeon Master Encyclopaedia

Dungeon Master is the only game with a 'DSP-2' chip (Digital Signal Processor) included in the game cartridge. This DSP chip helps the Super NES / Super Famicom handle more advanced 3D effects in mode 7 than it can handle normally.
Here is some information about how the program this chip: http://users.tpg.com.au/advlink/dsp/dsp2.html