"This manual is intended to provide the information necessary to install, maintain, expand, or write assembly-language software for the OS-9 systems. It assumes that the reader is familiar with the 6809 architecture, instruction set, and assembly language."

Front Cover

OS-9 Programmer's Manual


Contents Page 1


Contents Page 1


The Book was supplied in the same big box as all the OS9 Software

"OS9 is a versatile multiprogramming/Multi-tasking operating system for computers utilising the Motorola 6809 microprocessor. It is well suited for a wide range of applications on the 6809 computers of virtually any size or complexity.

    Its main features are:
  • Comprehensive management of all system resources: memory, I/O interfaces and CPU time
  • A powerful user interface that is easy to learn and use
  • True multiprogramming operation
  • Efficient operation in typical microcomputer configurations
  • expandable, device-independent unified I/O systems
  • Full support for modular ROMed software
  • Upwards and downwards compatibility with OS9 Level Two

OS9 was modeled on the Bell Telephone Laboratories UNIX operating system, which is becoming widely recognised as a standard for min and micro multiprogramming operating systems because of its versatility and relatively simple yet elegant structure."

Thanks to Robert Smith for the original book scans and to Duncan Smeed the owner of the box.

I'm currently missing the box can you help?