Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines / Controlling the Processor

MaximumProcessorSpeed

You can use the MaximumProcessorSpeed function to find out the maximum speed of the computer's microprocessor.

short MaximumProcessorSpeed();

DESCRIPTION

The MaximumProcessorSpeed function returns the maximum clock speed of the computer's microprocessor, in MHz.

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for MaximumProcessorSpeed is 16 ($10) in the low word of register D0. The processor speed value is returned in the low word of register D0.