Summary of “Basic”
A. J. Munday, R. A. Farrar · 1979
This language contains the facilities provided in most versions of extended BASIC. Some instructions may vary somewhat from one system to another; however, equivalents should be available. This applies particularly to String Functions, Commands and Control Codes, and to items marked with a +. We suggest that you modify the SYSTEM DEPENDENT INSTRUCTIONS MARKED BY + to conform to your own system and add other instructions in the spaces provided.