I/O Addressing; System Memory Map - NEC PowerMate Pro150 Series Service Manual

1-6 Technical Information
The system memory map in shown in Table 1-2.
Memory Space
100000-8000000
F0000-FFFFF
EC000-EFFFF
EA000-EBFFF
E8000-E9FFF
E0000-E7FFF
C8000-DFFFF
A0000-C7FFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF

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 1-3.
Address (Hex)
0000-000F
0020-0021
002E-002F
0040-0043
0048-004B
0060
0061
0064
0060, bit 7
0060, bits 6 through 0 Real time clock, address
Table 1-2 System Memory Map
Size Function
130048 KB Extended memory
64 KB AMI System BIOS
16 KB FLASH boot block (available as UMB)
8 KB ECSD (Plug and Play configuration area)
8 KB OEM logo (available as UMB)
32 KB BIOS reserved (currently available as UMB)
96 KB Available HI DOS memory (open to ISA and PCI
bus)
160 KB Available HI DOS memory (normally reserved for
Video BIOS)
1 KB Extended BIOS data
127 KB Extended conventional
512 KB Conventional base memory
Table 1-3 I/O Address Map
I/O Device Name
DMA controller 1 (channel 0-3)
Interrupt controller 1
I/O configuration registers
Timer 1
Timer 2
Keyboard controller data byte
NMI, speaker control
Keyboard controller, command/status byte
Enable NMI