Web site: (not active)
Origin: United Kingdom
Category: Desktop
Desktop environment: CLI
Architecture: Motorola 86000
Based on: Independent
Wikipedia: Sinclair QDOS
Media: Install
The last version | Released: 1984

QDOS – the QL operating system. It is a single-user multi-tasking operating system: that is, it provides the means for several independent programs to run concurrently in the QL, but does not provide any mechanisms to prevent those programs from interfering with each other.

It was designed by Tony Tebby, for Sinclair QL personal computer and its clones, 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.

Qdos can be thought of as a collection of several things:
1. A set of useful routines for performing functions such as memory allocation, Input/Output, etc.
2. A mechanism for maintaining lists of things to be done on interrupt, including the function of allocating slots of CPU time to programs which require them.
3. A mechanism for starting up the computer, and determining the configuration of any add-on hardware that is connected to it

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