change
the
rate
on
the
primary
console
to
retain
parallel
control.
The
alternate
{local)
device
creates
a log of
all
SCC transactions. The normal (log) output on
I/O
sub-
channel
X'OB'
is
suspended for
the
duration
of
the
SCC
assignment
to
the
remote
channel
(REMOTE
CHANNEL
switch in
SCC position;
ALTSEL
switch in OFF position).
CONTROL
COMMANDS
A
set
of
commands and display formats implements
operator
communication with hardware through
the
System Control
Console. These
hardware-control
commands,
called
II
SCC
Functions
ll
,
are
independent,
direct
hardware
controls
as
distinguished from
the
software-level
operating
controls
activated
from
the
SCC through
the
normal
I/o
system. A
special
micro-processor, working
independently
of
the
BP,
senses
and
controls
the
execution
of
SCC functions.
The
flexibility
of
character-oriented
communications
equip-
ment
and
micro-programmed control
significantly
enhance
many system
operating
and
diagnostic
features.
The basic command format provides a
four-level
interlock
on
critical
system controls by requiring a
correct
four-
character
sequence
to
initiate
a command
action.
In
ad-
dition,
context
analysis is provided to assure
that
com-
mands
are
executed
only in
appropriate
system
states.
This
basic format requires
that
each
command is
preceded
by
the
IIcontrol-Z
II
character
(control
and
Z keys depressed simul-
taneously).
Note
that
within
this
text,
the
control-Z
char-
acter
is represented wi th
the
symbol
II
ZCII
.
A
typical
command
sequence
is to
enter
IIZ
C
HLTII
from
the
SCC. The system responds by printing
II
(HLT)II
on
the
next
line
of
the
SCC
printout,
and
forcing
the
system
to
halt
instruction
execution
and
enter
the
IDLE
state.
If a
com-
mand
cannot
be
executed
due
to
improper syntax or
context,
the
system provides
an
odvisory message following
the
com-
mand
echo
indicating
the
probable
source of error. A
typi-
cal
example of
the
display format
is
II(RSY)
*EVENT A1*1I,
indicating
that
a
reset
command may not be
executed
prior
to
halting
instruction
execution.
(Refer to Table
21
for
a
complete
listing of
event
messages.)
The various control functions
that
may
be
exercised
from
the
SCC may be
generally
classified
into
three
categories:
operator
control commands,
diagnostic
control commands,
and
maintenance
control commands.
OPERATOR
CONTROL
COMMANDS
These commands provide
controls
which
an
operator
normally
uses
to
control
the
computer system.
By
enteri
ng
the
appro-
priate
command
the
operator
may
direct
the
computer system
to
load,
run,
halt,
reset,
read/set
the
sense switches, or
issue a
IIconsole
interrupt
ll
to
the
operating
software.
The sense switch control
and
console
interrupt commands
may
interact
with
the
software
and
are
always
operative.
All other SCC functions may be
enabled
or disabled by
the
SCC FUNCTIONS switch on
the
SCPo
Table 21. Event Messages
Display
*EVENT
00*
*EVENT
AO*
*EVENT A1*
*EVENT A2*
*EVENT
M*
*EVENT A8*
*EVENT
FO*
*EVENT
Fl*
*EVENT F4*
*EVENT F6*
*EVENT F9*
Significance
System
Initialization;
POWER
ON
or
SUPER
RESET.
c
Improper syntax for Z format command.
Command not
executed;
Improper syntax or system may not
be
in
IDLE
mode.
Command not
executed;
system not in
maintenance
mode.
Command not
executed;
SCC
FUNCTION
switch is in
DISABLE
position.
Power
ride
through;
recoverable
power
line
fai lure
detected;
power on
trap
requested.
Trap requested occurred;
inhibited
in P-Mode.
Basic processor error
halt;
watchdog
timeout
reset
issued when watchdog timeout alarm
bit
set.
(See
II
Processor Control Word
ll
.)
Basic processor halt; Address
Halt.
Basic processor halt;
Processor-Detected
Fault (PDF).
System
failed
micro-diagnostic
test
(followed by
Single
Clock
Status Register display of
the
element
that
fa i led).
Control Commands 153
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