Instruction manual

Table 67 (Cont.) NVR Console Mailbox Register Fields
HLT_ACT Halt action (bits<1:0>) temporarily encodes the desired console action
when the next internal processor halt occurs. The action taken is the
same as that described for HLT_SWX.
At power on, a restart halt action (HLT_ACT = 0 or 1) is treated as a
boot request.
This field is copied from the HLT_SWX field at power on and at entry to
the console or when SET or SHOW HALT console commands are issued.
19.2 NVR Console Flags Register (CPFLG)
Figure 33 shows the NVR console flags (CPFLG) storage location. Table 68 lists
its fields.
Figure 33 NVR Console Flags (CPFLG)
MR−0157−93RAGS
PFILE
00
07
LK401 VIDEO
CORRUPT
REENTER
MCS CRT GUARD
Table 68 NVR Console Flags (CPFLG) Fields
GUARD Guard bit (bit <0>); used by the console firmware during initialization.
CRT CRT flag (bit <1>); when set to 1, indicates that the console display is a CRT
display device. This determines the style of delete (CRT or hardcopy). This
field is determined at power on.
MCS Multinational flag (bit <2>); when set to 1, indicates that the console display
understands the DEC Multinational Character Set. This field is determined
at power on.
REENTER Reentry flag (bit <3>); used by the console firmware during initialization.
CORRUPT Corrupted data flag (bit <4>); used by the console firmware during
initialization.
VIDEO Video flag (bit <5>); when set to 1, indicates that the console display is a
video display device, rather than a terminal. The device type is encoded in
CONSOLE_ID. This field is determined at power on.
LK401 Keyboard type (bit <6>); used by the console firmware during initialization,
indicates whether the LK401 type has been determined. This bit is cleared
in a new system, so that the first user will be led through the keyboard
menu.
PFILE Parameter file (bit <7>); unused. Cleared when an NVR failure is detected
at power on, so that no parameter file is loaded.
Nonvolatile RAM 19–3