Port Functional
group Usage
9
year
A
status
A
B
status
B
C
status
C
D
status
D
E
RAM
...
3F
RAM
81
DMA
Channel 2 page register
82
Channel 3 page register
83
Channel 1 page register
87
Channel 0 page register
89
Channel 6 page register
8A
Channel 7 page register
8B
Channel 5 page register
8F
Refresh page register
96
EXM Configuration EXMID driver (EPC-2x) (W)
A0
Interrupt controller 2 Port 0
A1
Port
1
C0
DMA
Channel 4 address
C2
Channel 4 count
C4
Channel 5 address
C6
Channel 5 count
C8
Channel 6 address
CA
Channel 6 count
CC
Channel 7 address
CE
Channel 7 count
D0
Command/status
D2
DMA
request
D4
Command register (R)
Single-bit DMA req mask(W)
D6
Mode
D8
Set byte pointer (R)
Clear byte pointer (W)
DA
Temporary register (R)
Master
clear
(W)
DC
Clear mode reg counter (R)
Clear all DMA req mask (W)
DE
All DMA request mask
F0
Coprocessor Clear coprocessor busy
F1
Reset
coprocessor
1F0
IDE controller
Data register
1F1
Error / write precompensation
1F2
Sector
count
1F3
Sector
number
1F4
Cylinder low register
1F5
Cylinder high register
1F6
SDH
register
1F7
Status/command
register
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