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Inside Macintosh: Operating System Utilities /

Chapter 7 - Parameter RAM Utilities / Parameter RAM Utilities Reference

Routines

The Parameter RAM Utilities provide two functions for use by your application and one function for use by system software. At startup, system software uses the InitUtil function to read parameter RAM values into low memory. You can access the values through a system parameters record of type SysParmType described in the previous section. To obtain a pointer to the low-memory system parameters record, call the GetSysPPtr function. To copy the values in the system parameters record back into the clock chip, call the WriteParam function.

WARNING

The organization of parameter RAM is subject to change. Therefore, you should not manipulate parameter RAM values directly using the operating-system routines described in this chapter; instead, use the appropriate Toolbox routines.