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"
SCC
Functions",
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
"control-Z"
character
(control
and
Z keys depressed simul-
taneously).
Note
that
within this
text,
the
control-Z
char-
acter
is represented with
the
symbol
"Zc".
A
typical
command sequence is to
enter
"zc
HLP'
from
the
SCC. The system responds by
printing"
(HLT)"
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
advisory message following
the
com-
mand
echo
indicating
the
probable source of error. A
typi-
cal
example of
the
display format
is
"(RSY)
*EVENT
A 1
*",
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
entering the
appro-
priate
command the operator may
direct
the computer system
to
load,
run,
halt,
reset,
read/set
the
sense switches, or
issue a
"console
interrupt"
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
Al*
*EVENT A2*
*EVENT
M*
*EVENT A8*
*EVENT
FO*
*EVENT
Fl*
*EVENT F4*
*EVENT F6*
*EVENT
F9*
136 Control Commands
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
failure
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"
Processor Control
Word".)
Basic processor halt; Address Halt.
Basic processor halt; Processor-Detected Fault (PDF).
System fai led micro-diagnostic test (followed
by
Single
Clock
Status Register display of the
element
that
failed).
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