Turbo Pascal version 1.0 - compiler directives

In the Turbo Pascal version 1.0 manual the compiler directives default values are given special attention in several places.  Early in the manual, there is a note that says:

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Turbo Pascal provides a number of compiler directives to control special runtime facilities like e.g. index checking, recursion (CP/M-80 only), etc. PLEASE NOTICE that the [...]