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
IDE Drive Registers
1F0-R/W 85.8000.3E00 Data
1F1-R 85.8000.3E20 Error
1F1-W 85.8000.3E20 Features (write precomp)
1F2-R/W 85.8000.3E40 Sector count
1F3-R/W 85.8000.3E60 Sector number
1F4-R/W 85.8000.3E80 Cylinder low
1F5-R/W 85.8000.3EA0 Cylinder high
1F6-R/W 85.8000.3EC0 Drive/head
1F7-R 85.8000.3EE0 Status
1F7-W 85.8000.3EE0 Command
3F6-R 85.8000.7EC0 Alternate status
3F6-W 85.8000.7EC0 Device control
3F7-R 85.8000.7EE0 Drive address
3F7-W 85.8000.7EE0 None (tristate bus)
(continued on next page)
I/O Space Address Maps A–3