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3. MEMORY MAP
MainMemory (System)
0000000
SDRAM
Standard
128MB
A000000
SDRAM
Option
128MB
(Max)
4. I/O ADDRESS MAP
4-1. PC SPECIFICATION
Address
00-0F
DMA ch0-3 control
10-1F
(System)
20-21
Master 8259 Interrupt control
22-24
Chipset Configuration
40-43
Timer control
48-4B
(Timer control)
50-52
(System)
60-6F
Keyboard/Mouse control
70-7F
RTC/CMOS RAM Index/Data
80-8F
DMA Page Register
90-9F
System Port A Register (PS/2 port)
A0-A1
Slave 8259 Interrupt control
BIOS Memory
A0000
VGA RAM
128MB
C0000
VGA BIOS
40kB
C9FFF
UMB
144kB
F0000
System BIOS
64kB
FFFFF
Standard I/O [Option I/O]
UP-5900VS CIRCUIT DESCRIPTION
Address
400-40A
40B
EISA DMA Extended Mode control
410-4EF
4D6
EISA DMA Extended Mode control
4D7-57F
580-59F
POS I/O
5A0-7EF
7F0-7F1
PSC Special System Register
7F2-7FF
800-97F
980-99F
POS I/O
9A0-A78
5 – 3
Legacy ISA I/O
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