Specifications

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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