Title: Mastering OS-9 on the Tandy Color Computer
Author: Paul K. Ward
Year: 1995
Pages: 242


From the Preface:
You are holding the only hands-on introduction to OS-9 Level 2. It differs from preceding books on OS-9 Level because it is written for the intelligent beginner in a no-nonsense format, with clear, short examples which will speed you on your way to both USING and UNDERSTANDING OS-9 Level 2.