8-3
PG 720 P Programming Device
C79000-G7076-C721-02
Table 8-2
I/O Address Assignments
Address
Size
Description
from
to
byte
Basic Function
Possible Alternative Function
0000
000F
16
82C558E ––> DMA 1 Control
Register
(DMA 0, 1, 2, 3)
0010
001F
16
Unoccupied
0020
0021
2
82C558E ––> Interrupt controller 1
Control Register
0022
1
Integrated 82C206 and Chipset
Configuration Index Register
(SYSCFG)
0023
1
82C558E ––> Integrated 82C206
Configuration Data Register
0024
1
Chipset Configuration Data Register
(SYSCFG)
0025
002D
9
Unoccupied
002E
002F
2
Configuration port ultra I/O
0030
003F
16
Unoccupied
0040
0042
3
82C558E ––> Timer Channel 0..2
(Clock,Refresh,Speaker )
0043
1
82C558E ––> Timer Control Register
0044
005F
28
Unoccupied
0060
1
Keyboard controller date
0061
1
82C558E ––> System Control Port B
(Timer,Speaker control,NMI,Parity )
0062
0063
2
Unoccupied
0064
1
Keyboardcontroller CMD / STATUS
0065
006F
11
Unoccupied
0070
1
NMI enable, RTC Index
0071
1
RTC date
0072
0080
15
Unoccupied
0081
0083
3
82C558E ––> DMA Page Register
Ch2,3,1
0084
0086
3
Unoccupied
0087
1
82C558E ––> DMA Page Register
Ch0
0088
1
Unoccupied
0089
008B
3
82C558E ––> DMA Page Register
Ch6,7,5
008C
008E
3
Unoccupied
008F
1
82C558E ––> DMA Page Register
Ch4
0090
0091
2
Unoccupied
0092
1
82C558E ––> System Control Port A
(Fast Reset,Fast A20)
0093
009F
13
Unoccupied
Hardware Information