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
COM2 Serial Port Registers
2F8-R 0DLAB=0 85.8000.5F00 COM2 receiver buffer
2F8-W 0DLAB=0 85.8000.5F00 COM2 transmitter holding
2F8 0DLAB=1 85.8000.5F00 COM2 divisor latch (LSB)
2F9 1DLAB=0 85.8000.5F20 COM2 interrupt enable
2F9 1DLAB=1 85.8000.5F20 COM2 divisor latch (MSB)
2FA-R 85.8000.5F40 COM2 interrupt identification
2FA-W 85.8000.5F40 COM2 FIFO control
2FB 85.8000.5F60 COM2 line control
2FC 85.8000.5F80 COM2 modem control
2FD 85.8000.5FA0 COM2 line status
2FE 85.8000.5FC0 COM2 modem status
2FF 85.8000.5FE0 COM2 scratch pad
Parallel Port Registers
3BC-R/W 85.8000.7780 Data
3BD-R 85.8000.77A0 Status
3BE-R/W 85.8000.77C0 Control
3BF 85.8000.77E0 None (tristate)
(continued on next page)
A–4 I/O Space Address Maps