Shoutime got the Seibu Kaihatsu CATS DVD System. It ran DVD-based strip mahjong games on this system between 1999 and 2006, as well as two similar Senkyu-like games (Gravure Collection and Pakkun Ball TV) using ordinary joystick/button controls. This appears to be the last major arcade game system by Seibu (not counting Fever Soccer).
One of the mahjong games sounds like a rap song - "TRAP ZONE - Pleasure Train of Lust". lol