86-DOS (known internally as QDOS, [1] for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit. 86-DOS shared a few of its commands with other operating systems such as OS/8 and CP/M, which made it easy to port programs from the latter.

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1980年，西雅图公司24岁的Tim Paterson（蒂姆·帕特森），用4个月开发了一个叫QDOS的操作系统。 QDOS的本意是“简单而有瑕疵的操作系统”（Quick and Dirty Operating System）

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QDOS is the multitasking operating system found on the Sinclair QL personal computer and its clones. It was designed by Tony Tebby whilst working at Sinclair Research, as an in-house alternative to 68K/OS, which was later cancelled by Sinclair, but released by original authors GST Computer Systems.

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