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| | Reference.com/Encyclopedia/QDOS |
 | | QDOS was created because sales of SCP's 8086 computer kit, demonstrated in June 1979 and shipping in November, were languishing due to the absence of an operating system. | | | QDOS met IBM's main criteria: It looked like CP/M, and it was easy to adapt existing 8-bit CP/M programs to run under it, notably thanks to QDOS's TRANS command which would translate source files from 8080 to 8086 machine instructions. | | | As a result, IBM turned to Microsoft, since Microsoft was a CP/M subcontractor, sold a plug-in Z80 board that made the Apple II capable of running CP/M and, having ported their BASIC to SCP's bare 8086 hardware already had experience with writing OS-level code for this processor and in general. |
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http://www.reference.com/browse/wiki/QDOS
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| | Microsoft [encyclopedia] |
| | In 1983, leveraging a prior contract with IBM to produce the IBM PC's BASIC interpreter, Microsoft contracted with IBM to provide an operating system for that machine as well. | | | Microsoft then bought the rights to use Tim Patterson's QDOS (Quick and Dirty Operating System) on the PC and released it via IBM as Microsoft DOS. |
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http://www.kosmoi.com/Computer/Microsoft
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