Lenovo NetVista Technical information manual for NetVista 6269, 6568, 6569, 65 - Page 55

Appendix B. System address maps, System memory map, I/O address map

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Appendix B. System address maps The following charts represent how the hard disk stores different types of information. Address ranges and byte sizes are approximate. System memory map The first 640 KB of system board RAM is mapped starting at address hex 00000000. A 256 byte area and a 1 KB area of this RAM are reserved for BIOS data. Memory can be mapped differently if POST detects an error. Table 32. System memory map Address range (decimal) Address range (hex) 0 K - 512 KB 00000 - 7FFFF 512 K - 639 KB 80000 - 9FBFF 639 K - 640 KB 9FC00 - 9FFFF 640 K - 767 KB A0000 - BFFFF 768 K - 800 KB C0000 - C7FFF 800 K - 896 KB C8000 - DFFFF 896 K - 1 MB E0000 - FFFFF 1 MB - 16 MB 1000000 - FFFFFF 16 MB - 4096 MB 10000000 - FFDFFFFF FFFE0000 - FFFFFFFF Size 512 KB 127 KB 1 KB 128 KB 32 KB 96 KB 128 KB 15 MB 4080 MB 128 KB Description Conventional Extended conventional Extended BIOS data Dynamic video memory display cache Video ROM BIOS (shadowed) PCI space, available to adapter ROMs System ROM BIOS (main memory shadowed) PCI space PCI space (positive decode) System ROM BIOS I/O address map The following figure lists resource assignments for the I/O address map. Any addresses that are not shown are reserved. Table 33. I/O address map Address (hex) Size (bytes) 0000 - 000F 16 0010 - 001F 16 0020 - 0021 2 0022 - 003F 30 0040 - 0043 4 0044 - 00FF 28 0060 1 0061 1 0064 1 0070, bit 7 1 bit Description DMA 1 General I/O locations, available to PCI bus Interrupt controller 1 General I/0 locations, available to PCI bus Counter/timer 1 General I/O locations, available to PCI bus Keyboard controller byte, reset IRQ System port B Keyboard controller, CMD/ATAT byte Enable NMI © Copyright IBM Corp. 2000 45

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© Copyright IBM Corp.
2000
45
Appendix B.
System address maps
The following charts represent how the hard disk stores different types of information.
Address ranges and byte sizes are approximate.
System memory map
The first 640 KB of system board RAM is mapped starting at address hex 00000000.
A 256 byte area and a 1 KB area of this RAM are reserved for BIOS data.
Memory
can be mapped differently if POST detects an error.
I/O address map
The following figure lists resource assignments for the I/O address map.
Any
addresses that are not shown are reserved.
Table 32. System memory map
Address range
(decimal)
Address range (hex)
Size
Description
0 K – 512 KB
00000 – 7FFFF
512 KB
Conventional
512 K – 639 KB
80000 – 9FBFF
127 KB
Extended conventional
639 K – 640 KB
9FC00 – 9FFFF
1 KB
Extended BIOS data
640 K – 767 KB
A0000 – BFFFF
128 KB
Dynamic video memory display cache
768 K – 800 KB
C0000 – C7FFF
32 KB
Video ROM BIOS (shadowed)
800 K – 896 KB
C8000 – DFFFF
96 KB
PCI space, available to adapter ROMs
896 K – 1 MB
E0000 – FFFFF
128 KB
System ROM BIOS (main memory shadowed)
1 MB – 16 MB
1000000 – FFFFFF
15 MB
PCI space
16 MB – 4096 MB
10000000 – FFDFFFFF
4080 MB
PCI space (positive decode)
FFFE0000 – FFFFFFFF
128 KB
System ROM BIOS
Table 33. I/O address map
Address (hex)
Size (bytes)
Description
0000 – 000F
16
DMA 1
0010 – 001F
16
General I/O locations, available to PCI bus
0020 – 0021
2
Interrupt controller 1
0022 – 003F
30
General I/0 locations, available to PCI bus
0040 – 0043
4
Counter/timer 1
0044 – 00FF
28
General I/O locations, available to PCI bus
0060
1
Keyboard controller byte, reset IRQ
0061
1
System port B
0064
1
Keyboard controller, CMD/ATAT byte
0070, bit 7
1 bit
Enable NMI