86-DOS (known internally as QDOS, 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. Its application programming interface was very similar to that of CP/M. The system was licensed and then purchased by Microsoft and developed further as MS-DOS and IBM PC DOS.

References

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Further reading

  • (41 pages)
  • 86-DOS documentation from Paterson Technology
  • Run SCP 86-DOS 1.0 in the Altair 8800 SIMH simulator by Howard M. Harte