1-8 Technical Information
When Power Management is enabled the computer automatically activates power-saving
features and enters a sleep mode whenever inactivity is sensed. The computer's power-
saving functions are as follows.
n
Reduces the CPU clock speed
The CPU clock speed is changed from 33 MHz to 8 MHz (16 MHz in the
PowerMate V4100) to put the computer in sleep mode. The cache and video
clocks are changed at the same time.
n
Blanks out the monitor
Puts the video controller into sleep mode. The vertical sync clock and blank sig-
nals to the monitor are disabled.
n
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.
I/O Addressing
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex) ad-
dresses of I/O devices are listed in Table Section 1-5.
Table Section 1-5 I/O Address Map
Address (Hex)
I/O Device Name
000-01F
DMA controller 1 (channel 0-3)
020-03F
Interrupt controller
040-05F
Timer
060-063
PPI (Programmable Peripheral Interface) keyboard, equipment switches,
timer
060-06F
Keyboard controller
070-07F
Real-time clock, CMOS memory, NMI mask
080
Manufacturer's diagnostic checkpoint
081-09F
DMA page register
0A0-0AF
NMI (non-maskable interrupt) mask
092
PS/2 alternate Fast A20 Gate, Hot Reset
094
Extended system port (NEC-specific hardware setup)
095
Extended system port (NEC-specific hardware setup)
097
Extended system port (NEC-specific hardware setup)