Specifications
Port Functional group Usage
3 End horizontal blanking
4 Start horiz retrace pulse
5 End horizontal retrace
6 Vertical total register
7 Overflow
8 Preset row scan
9 Max scan line/others
A Cursor start
B Cursor end
C Start address high
D Start address low
E Cursor location high
F Cursor location low
10 Vertical retrace start
11 Vertical retrace end
12 Vert display enable end
13 Offset
14 Underline location
15 Start vertical blank
16 End vertical blank
17 CRTC mode control
18 Line compare
3D8 Mode control reg (color) (W)
3D9 Color select register (W)
3DA Input status reg 0 (color) (R)
Feature control (color) (W)
3DB Clear light pen (color) (W)
3DC Preset light pen (color) (W)
3DE AT&T / M24 (W)
3F2 Floppy disk controller Operations
3F4 Command
3F5 Data
3F7 Control, also IDE drive
address register
3F8 COM1 serial port Receiver/transmitter buffer
Baud rate divisor latch (LSB)
3F9 Interrupt enable register
Baud rate divisor latch (MSB)
3FA Interrupt ID register
3FB Line control register
3FC Modem control register
3FD Line status register
3FE Modem status register
8100 Memory mapping Mapping register
8102 Mapping register
8104 Mapping register
8106 Mapping register
8108 Mapping register
810A Mapping register
810C Mapping register
810E Mapping register
8110 Mapping register
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