Port Functional
group Usage
13
Offset
14
Underline
location
15
Start
vertical
blank
16
End
vertical
blank
17
CRTC
mode
control
18
Line
compare
3B8
Mode control reg (mono) (W)
3B9
Preset light pen (mono) (W)
3BA
Input status reg 0 (mono) (R)
Feature control (mono) (W)
3BB
Clear light pen (mono) (W)
3BF
Hercules
register
3C0
Attribute index register
Attribute data register (W)
3C1
Attribute data register (R)
0X
Palette
registers
10
Attribute
mode
control
11
Overscan
control
12
Color
plane
enable
13
Horizontal
PEL
panning
14
Color
select
3C2
Misc output register (W)
Input status register 0 (R)
3C3
Video subsystem enable reg
3C4
Sequencer index register
3C5
Sequencer data register
0
Reset
register
1
Clocking
mode
register
2
Map
mask
register
3
Character map select reg
4
Memory
mode
register
3CA
Feature control register (R)
3CC
Misc output register (R)
3CE
Graphics controller index reg
3CF
Graphics data register
0
Set/reset
1
Enable
set/reset
2
Color
compare
3
Data
rotate
4
Read
map
select
5
Graphics
mode
6
Miscellaneous
7
Color
don't
care
8
Bit
mask
9
Address offset A (PR0A)
A
Address offset B (PR0B)
B
Memory
size
(PR1)
C
Video
select
(PR2)
D
CRT
control
(PR3)
E
Video
control
(PR4)
F
Lock/status
(PR5)
3D4
CRT index register (color)
3D5
CRT controller data (color)
0
Horizontal
total
1
Horiz display enable end
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