Power Management; I/O Addressing - NEC POWERMATE OFFICE 2513 Service Manual

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.
T
Reduces CPU clock speed
The CPU, cache, and video clock speeds are reduced, putting the system in the
Suspend mode.
T
Blanks out the monitor
Puts the video controller into Suspend mode. The vertical sync clock and blank
signals to the monitor are disabled.
T
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.
Address (Hex)
0000-000F
0020-0021
0040-0043
0048-004B
0060-0060
0061-0061
Table 1-5 I/O Address Map
I/O Device Name
DMA Controller 1
Interrupt Controller 1
System Timer 1
System Timer 2
Keyboard Controller Data Byte
NMI Status and System Speaker
Controller