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