The Sinclair QDOS Companion

The Sinclair QDOS Companion is an in-depth guide to the working of the Sinclair QL's operating system, QDOS and how to interface to it when writing machine code, including how to use its multitasking facility and how to link to peripherals.

It includes an overview of the Sinclair QL's second processor, the Intel 8049 chip which is used to handle peripheral devices, such as the keyboard and sound, and how to control it without using QDOS.

A useful guide, it suffers now from assuming that the system variables would always be stored at $28000 and the screen at $20000 which was not the case in later QL operating systems.

Title: The Sinclair QDOS Companion
Author: Andrew Pennell
Publisher: Sunshine Books
Year of Publication: 1985
Commercial Status: Commercial
Price as at July 1985: £6.95
Reviews: QL User (July 1985)
ISBN: 0-94640-869-6