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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May 21, 2007 · 86-DOS也就是QDOS，它由Tim Paterson用6周时间写成，它是基于当时十分流行的CP/M的思想编写的，它使用8086芯片，代码约为4000行汇编。 Microsoft以5万美元买得这个操作系统，修改它并把新的操作系统称为MS-DOS，然后把这个东西交给了IBM。

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