User`s guide

A.2 PCI Sparse I/O Space
Table A–1 (Cont.) PC87312 Combination Controller Register Address Space
Map
Address Offset
Read/Write
Physical
Address Register
Diskette Registers
3F0-R 85.8000.7E00 Status A
3F1-R 85.8000.7E20 Status B
3F2-R/W 85.8000.7E40 Digital output
3F3-R/W 85.8000.7E60 Tape drive
3F4-R 85.8000.7E80 Main status
3F4-W 85.8000.7E80 Data rate select
3F5-R/W 85.8000.7EA0 Data (FIFO)
3F6 85.8000.7EC0 None (tristate bus)
3F7-R 85.8000.7EE0 Digital input
3F7-W 85.8000.7EE0 Configuration control
COM1 Serial Port Registers
3F8-R 0DLAB=0 85.8000.7F00 COM1 receiver buffer
3F8-W 0DLAB=0 85.8000.7F00 COM1 transmitter holding
3F8 0DLAB=1 85.8000.7F00 COM1 divisor latch (LSB)
3F9 1DLAB=0 85.8000.7F20 COM1 interrupt enable
3F9 1DLAB=1 85.8000.7F20 COM1 divisor latch (MSB)
3FA-R 85.8000.7F40 COM1 interrupt identification
3FA-W 85.8000.7F40 COM1 FIFO control
3FB 85.8000.7F60 COM1 line control
3FC 85.8000.7F80 COM1 modem control
3FD 85.8000.7FA0 COM1 line status
3FE 85.8000.7FC0 COM1 modem status
3FF 85.8000.7FE0 COM1 scratch pad
I/O Space Address Maps A–5