HP Vectra Technical Reference Manual page 401

0.9 Hard Reset Enable Port
Hard Reset Enable Register (Port 78H): This write only port enables the hard reset line from the
HP-HIL controller. Table 0.9 shows the bit definitions for this port.
Table 0.9
Hard Reset Enable Register
Bit
7
6-0
Data
1
o
Description
Enable hard reset from HP-HIL controller chip.
Disable and clear hard reset from HP-HIL controller chip.
Reserved.
0.10
NMI Sources and Involved I/O Ports
The non-maskable interrupt (NMI) of the 80286 is attached to circuitry which allows multiple
sources to cause an NMI. Each of these sources can be disabled individually as well as collectively.
Figure 0.2 is a block diagram of the NMI circuit.
392 I/O Port Map