User guide

Table 9–10 (Cont.) Super I/O Register Address Space Map
Address Offset
Read/Write
Physical
Address Register
Parallel Port Registers
3BC-R/W 1 C000 7780 Data register
3BD-R 1 C000 77A0 Status register
3BE-R/W 1 C000 77C0 Control register
3BF 1 C000 77E0 None (tristate bus)
Table 9–11 lists the addresses for the integrated device electronics (IDE)
registers.
Table 9–11 Integrated Device Electronics Register Addresses
Address
Offset
Physical
Address Read Function Write Function
1F0 1 C000 3E00 Data Data
1F1 1 C000 3E20 Error Features (write precomp)
1F2 1 C000 3E40 Sector count Sector count
1F3 1 C000 3E60 Sector number Sector number
1F4 1 C000 3E80 Cylinder low Cylinder low
1F5 1 C000 3EA0 Cylinder high Cylinder high
1F6 1 C000 3EC0 Drive/head Drive/head
1F7 1 C000 3EE0 Status Command
3F6 1 C000 7EC0 Alternate status Device control
3F7 1 C000 7EE0 Drive address Not used
9.5 Keyboard and Mouse Controller
CPU Address: 0x1C0000C00 - 0x1C0000C80
Nbus offset: 0x0060 - 0x0064
The keyboard/mouse controller function is contained in a single-chip
microcomputer (Intel 82C42PE) programmed to be IBM PC/AT compatible
and can drive DECpc supported keyboards and a PS/2 type mouse. The keyboard
and mouse ports are female 6-pin mini-DIN, PS/2 type connectors. The keyboard/
mouse controller is programmed to allow either device to operate on either port.
Nbus 9–21