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Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines

This section describes the Power Manager dispatch routines. You can use these routines to

• determine what Power Manager features are available
• set and read the sleep and wakeup timers and disable or disable the sleep timer
• set, read, enable, and disable the timer that dims the screen
• control the hard disk
• get information about the battery
• get and set the state of the internal modem
• control the processing speed of the processor and processor cycling
• get and set the SCSI ID the computer uses in SCSI disk mode

Note

The functions in this section are described using the C language interface. The section "Summary of the Power Manager," beginning on page 6-67, includes both Pascal and C interfaces.

Assembly-language note:

All the functions in this section share a single trap, _PowerMgrDispatch ($A09E). The trap is register based: parameters are passed in register D0 and sometimes also in A0. A routine selector value passed in the low word of register D0 determines which routine is executed.

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Subtopics

Determining the Power Manager Features Available

Controlling the Sleep and Wakeup Timers

Controlling the Dimming Timer

Controlling the Hard Disk

Getting Information About the Internal Batteries

Controlling the Internal Modem

Controlling the Processor

Getting and Setting the SCSI ID

Application-Defined Routines

Sleep Procedures

Hard Disk Spindown Function