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Appendix A: Chip Set & I/O Map
A
A
A-5
VGA
I/O Addr
Functional group
Usage
3B4
VGA
CRT Controller index
3B5
CRT Controller data
3BA
Feature control output, Input
status
3C0
Attribute controller Index/Data
3C1
Attribute controller Index/Data
3C2
Miscellaneous output, Input status
3C3
Sleep
3C4
Sequencer Index
3C5
Sequencer Data
3C6
Video DAC pixel mask, Hidden
DAC register
3C7
Pixel address read mode, DAC
state
3C8
Pixel mask write mode
3C9
Pixel data
3CA
Feature control readback
3CC
Miscellaneous output readback
3CE
Graphics controller index
3CF
Graphics controller data
3D4
CRT controller index
3D5
CRT controller data
3DA
Feature control, pinput status
3F0
Configuration 37C651 Super I/O
Combo chip
3F1
Configuration 37C651 Super I/O
Combo chip
46E8
VGA
Adapter Sleep
Serial I/O (COM A) Port
I/O Addr
Functional group
Usage
3F8
COM A 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
Interrupt Control Registers
I/O Addr
Functional group
Usage
4D0
Interrupt
Edge/ level control - Int1
4D1
Edge/ level control - Int2
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