There have been many suggested possibilities for what MSX actually stands for, MicroSoft eXtended (Being one) in reference to the built-in MSX-BASIC programming language. But the truth (according to Kazuhiko Nishi, the founder of the MSX computer) states that Machines with Software eXchangeability is it's true definition. There have been 4 MSX computers in production, MSX 1 (1983), MSX 2 (1986), MSX 2+ (1988) and MSX turbo R (1990). Before it's demise, 5 million MSX computers had been sold worldwide.