Instruction manual

Component Address Length Description
Halt procedure
value
+ 110 8 bytes Value of R26 (procedure value) when a
processor halt condition is encountered; this
value is cleared to zero at system bootstraps
or secondary processor starts.
Reason for halt + 118 8 bytes The value which indicates why the processor
was halted. Legal values are:
Code Halt Reason
0 Reserved
1 Powerup
2 Console operator halted system
by means of the HALT command
3 Console operator requested a
system crash
4 Processor executed HALT
instruction while in Kernel
mode
5 Processor halted due to Kernel-
Stack-Not-Valid fault
6 Processor halted due to Double
Error abort
7 Invalid SCBB
8 Invalid PTBR
9-FF Reserved
Other Implementation-dependent
Reserved for
software
+ 120 8 bytes Reserved for system software. This is
preserved across restarts.
Reserved + 128 24 bytes Reserved for future architectural extensions.
Figure 28 PALcode Revision Quadword
16
MR−0152−93RAGS
63 08 0039
0731
SBZ Proc_cnt SBZ PALtype alph
SBZ = should be zero
Proc_cnt = number of processors that this PALcode supports
PALType is the PALcode type
0 = Standard PALcode
1 = Ultrix Version of PALcode
2-127 = Reserved for DIGITIAL
128-255 = Reserved for non-Digital PALcode
16–42 Console