1-12 Technical Information
Power Management
Each system incorporates power management features that lower power consumption when
there is no activity detected from the keyboard, mouse, diskette drive, CD-ROM reader, or
hard disk drive after a pre-defined period of time. As soon as activity is detected the system
resumes where it left off.
With Power Management enabled, the system automatically activates the power-saving
features and enters Suspend mode when prolonged inactivity is sensed. The system’s
power-saving functions are as follows.
Reduces CPU clock speed
The CPU, cache, and video clock speeds are reduced, putting the system in the
Suspend mode.
Blanks out the monitor
Puts the video controller into Suspend mode. The vertical sync clock and blank
signals to the monitor are disabled.
Forces the IDE devices into stand-by mode
A suspend command is sent to the IDE devices which put the devices into a
stand-by mode.
The automatic polling feature in Windows
95 keeps the system from automatically
entering power management. For automatic power management, the auto insert notification
must be disabled.
I/O Addressing
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table 1-5.
Table 1-5 I/O Address Map
Address (Hex)
I/O Device Name
0000-000F
DMA Controller 1
0020-0021
Interrupt Controller 1
0040-0043
System Timer 1
0048-004B
System Timer 2
0060-0060
Keyboard Controller Data Byte
0061-0061
NMI Status and System Speaker
Controller
