Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines / Controlling the Processor

FullProcessorSpeed

You can use the FullProcessorSpeed function to find out whether the computer will run at full speed the next time it restarts.

Boolean FullProcessorSpeed();

DESCRIPTION

The FullProcessorSpeed function returns a Boolean value of true if, on the next restart, the computer will start up at its maximum processor speed; it returns false if the computer will start up at its reduced processor speed.

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for FullProcessorSpeed is 18 ($12) in the low word of register D0. The Boolean result is returned in the low byte of register D0.