1-8 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.
When Power Management is enabled, the computer automatically activates power-saving fea-
tures and enters a suspend mode whenever inactivity is sensed. The computer's power-saving
functions are as follows.
n
Reduces the CPU clock speed
The CPU, cache, and video clock speeds are reduced, putting the computer in the
suspend mode.
n
Blanks out the monitor
Puts the video controller into suspend mode. The vertical sync clock and blank signals
to the monitor are disabled.
n
Forces the IDE devices into stand-by mode
n
A suspend command is sent to the IDE devices which put the devices into a stand-by
mode.
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 Section 1-3.
Table Section 1-3 I/O Address Map
Address (Hex)
I/O Device Name
0000-000F
DMA controller 1 (channel 0-3)
0200-0021
Interrupt controller 1
0400-0043
Timer 1
0408-004B
Timer 2
0060
Keyboard controller byte
0061
NMI, speaker controller byte
0070, bit 7
Enable NMI
0070, bit 6:0
Real-time clock address
0071
Real-time clock data
Summary of Contents for PowerMate VP75
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