These CPUs were usually made by a third party such as Cyrix or AMD. Dell started out as one of these manufacturers, under its original name PC Limited. In 1990, the NeXTstation workstation computer went on sale, for "interpersonal" computing as Steve Jobs described it. The NeXTstation was meant to be a new computer for the 1990s, and was a cheaper version of the previous NeXT Computer. Despite its pioneering use of Object-oriented programming concepts, the NeXTstation was somewhat a commercial failure, and NeXT shut down hardware operations in 1993. In the early 1990s, the CD-ROM became an industry standard, and by the mid-1990s one was built into almost all desktop computers, and towards the end of the 1990s, in laptops as well. Although introduced in 1982, the CD ROM was mostly used for audio during the 1980s, and then for computer data such as operating systems and applications into the 1990s. Another popular use of CD ROMs in the 1990s was multimedia, as many desktop computers started to come with built-in stereo speakers capable of playing CD quality music and sounds with the Sound Blaster sound card on PCs. IBM introduced its successful ThinkPad range at COMDEX 1992 using the series designators 300, 500 and 700 (allegedly analogous to the BMW car range and used to indicate market), the 300 series being the "budget", the 500 series "midrange" and the 700 series "high end". This designation continued until the late 1990s when IBM introduced the "T" series as 600/700 series replacements, and the 3, 5 and 7 series model designations were phased out for A (3&7) & X (5) series. The A series was later partially replaced by the R series. By the mid-1990s, Amiga, Commodore and Atari systems were no longer on the market, pushed out by strong IBM PC clone competition and low prices. Other previous competition such as Sinclair and Amstrad were no longer in the computer market. With less competition than ever before, Dell rose to high profits and success, introducing low cost systems targeted at consumers and business markets using a direct-sales model. Dell surpassed Compaq as the world's largest computer manufacturer, and held that position until October 2006. In 1994, Apple introduced the Power Macintosh series of high-end professional desktop computers for desktop publishing and graphic designers. These new computers made use of new Motorola PowerPC processors as part of the AIM alliance, to replace the previous Motorola 68k architecture used for the Macintosh line.