Specifications

Appendix A: Chipset and I/O Map
55
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, input status
3F0 Configuration PC87366 Super I/O
Combo chip
3F1 Configuration PC87366 Super I/O
Combo chip
46E8 VGA Adapter Sleep
Table A-18. Serial I/O (Com1) Port: National Semiconductor PC87336
emulating8552ofPC/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
Table A-19. EPC Registers
I/O Addr Functional group Usage
8102 EPC-8A registers Peripheral Enables
Table A-20. VME Registers
I/O Addr Functional group Usage
8130 VME and misc. control VME map WA21–16
8132 VME and misc. control Alias VME map WA21–16
8133 VME and misc. control Alias VME map WA21–16
8144 VME and misc. control Alias VME map WA21–16
Table A-17. VGA
I/O Addr Functional group Usage