The Emotion Engine (EE) is a powerful 128-bit RISC VLIW processor, made in a few versions, based on the MIPS R5900 (MIPS IV-subset), and jointly designed with Toshiba and Sony. Mass production began in 1999. Its main use is in Sony PlayStation 2 video game consoles, of which over 100 million have been sold, making EE a surprisingly common platform. The identity of the EE and the PS2 are closely connected. The PS2 was the original and main reason EE was developed, PS2 was the original product that used EE, and PS2 is still EE's primary market. If there was no PS2, there would be no Emotion Engine.