Specifications

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 (Com1) Port:
VLSI 37C651/653 emulates 8552 of PC/AT
I/O Addr Functional group Usage
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
EPC Registers
I/O Addr Functional group Usage
8102 EPC-8 Peripheral Enables
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