A multiuser, multitasking, real-time operating system from BlackBerry. Originally developed by QNX Software Systems, Ltd., Ottawa, Ontario, and sold to home entertainment company Harman International in 2004, the QNX division was acquired by BlackBerry (then Research In Motion) in 2010. BlackBerry Tablet OS and BlackBerry 10 QNX was first used in BlackBerry PlayBook tablets. It is also the OS in the BlackBerry 10 smartphone, a complete change for BlackBerry phones. See BlackBerry 10. For Embedded Systems QNX runs on a variety of popular platforms in the embedded systems market, including x86, PowerPC, MIPS and ARM. During Harman's ownership of QNX, the OS was widely used in automobile entertainment and navigation control systems. Noted for its low-memory requirement and rapid response, QNX was first introduced in 1982 for the x86 market. QNX-4 became the first POSIX-compliant version. See BlackBerry, smartphone and POSIX.