The Ensoniq ES5505 OTIS/OTISR2, and ES5510 ESP (Ensoniq Signal Processor) were also used in various arcade games. They were all manufactured on the CMOS process. OTTO was licensed to Advanced Gravis for use in the Gravis Ultrasound card. In 1994, production began on PC sound cards for home computers. The design of the video-game console Atari Panther also included the OTIS chip, though the product never reached series production. A dedicated version of OTTO, ES5530/35 OPUS, was developed for AT-bus sound cards, featuring built-in joystick and CD-ROM interface.