Power Management; I/O Addressing - NEC POWERMATE VE - SERVICE MANUAL 05-1996 Service Manual

Memory Space
000C0000-000C7FFF
000A0000-000BFFFF
00080000-0009FFFF
00000000-0007FFFF

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 (shipped enabled), the system automatically activates the
power-saving features and enters a suspend mode whenever inactivity is sensed.

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 1-4.
Address (Hex)
0000-000F
0020-0021
0040-0043
0048-004B
0060
0061
0064
0070-007F
0080-008F
00A0-00A1
00C0-00DE
00E0-00EF
Table 1-3 System Memory Map
Size Function
32 KB Video BIOS (Shadowed in DRAM)
128 KB Video Buffer (SMM space Non-Cacheable)
128 KB Optional memory space gap (DOS Apps)
512 KB DOS applications (No read/write protect) (Always
cacheable)
Table Section 1-4 I/O Address Map
I/O Device Name
DMA controller 1 (channel 0-3)
Interrupt controller 1
Timer 1
Timer 2
Keyboard controller data byte
NMI status and speaker control
Keyboard controller cmd/status byte
Real-time clock, NMI mask
DMA page registers
Interrupt controller 2
DMA controller 2
Reserved
Technical Information 1-7