Operator Section Address-Compare Controls. Check-Stop Indicator .
Configuration Controls.
Display-and-Enter Controls.
Emergency-Pull Switch. Enable-System-Clear Key I MPL Controls Interrupt Key
Load Indicator Load Key.
Load-Unit-Address Controls Manual Indicator Power-Off Key
Power-On Key
Rate Control. Restart Key Start Key. Stop Key. Store-Status Key System Indicator System-Reset Key
Test Indicator Contents
Thermal/CB Power-Check Indicator TOO Clock Key .
Wait Indicator Remote Operator-Control Panel
Customer-Engineer Section The system console provides the functions necessary
to operate and control the system. It consists of the
system control panel and, in most cases, an associat­
ed console device, which may be used either as an I/O device or as a manual display-and-enter device.
The system console may be implemented in various
technologies and configurations; however, certain
functions are basic to all models.
The system-control-panel part of the system con­
sole contains an operator section and a customer­
engineer section.
The operator section provides a means for the
control and indication of power, the indication of
system status, operator-to-system communication,
the control of time-of-day clock security, initial pro­
gram loading, resets, and other controls required by
the operator for intervening in normal programmed
operation. It may include controls used for loading
microprograms into reloadable control storage and
for loading resident diagnostic programs.
The customer-engineer section includes controls
intended only for customer-engineer use. Additional
customer-engineer controls may be available on the
main-storage and channel frames.
System Console
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The console device, when used as an I/O device,
provides a means of communicating control informa­
tion and of entering and displaying text. Implemen­
tation of this device is model-dependent; the device typically may be a keyboard and an associated print­
er or cathode-ray tube (CRT).
The specific console device provided on a paiticu­
lar model of System/370 is described in the Systems
Reference Library (SRL) and System Library (SL)
publications for that model.
Operator Section
The operator section contains the basic controls
required by the operator and the controls required
by the operator for intervening in normal programmed
operation. These controls may be interspersed
with customer-engineer controls and may, depending
on the model, contain switch positions and nomen­
clature additional to those described here.
Machine errors detected during manual opera­
tions do not cause an immediate interruption or log­
out but may, in some cases, create a pending
machine-check-interruption condition. This interrup­
tion request, unless it is removed by the use of a
System Console 243

reset function, is honored when the CPU is again in
the operating state and enabled for the interruption.
A machine error that occurs in a manual operation
from whieh recovery cannot be made terminates the
operation, and the CPU is placed in the check-stop
state.
The following table lists operator controls that are
provided on all models. Some models provide addi­
tional controls.
Address-Compare Controls
These eontrols provide a means of setting a main­
storage address and stopping the CPU when the
address set up on the controls matches the address
used in a main-storage reference. One of the address-compare controls provides
two or more settings to specify the action to be tak­
en, if any, when the address match occurs. The two
settings are labeled "normal" and "stop." Placing
this control in other than the normal setting causes
the test indicator to go on.
The "normal" setting disables the address­
compare operation.
The "stop" setting causes the CPU to enter the
stopped state on a match. The point at which the CPU enters the stopped state depends on the model
and the type of reference. Pending I/O, external,
and machine-check interruptions mayor may not be
taken before the stopped state is entered.
In addition to the control for selecting the action
to be taken, another control may be provided for
specifying the type of main-storage reference which
is to be compared. A model may provide one or
more of the following settings, in addition to others:
The "any" setting causes the address comparison
to be performed on all main storage references.
The "data-store" setting causes address compari­
son to be performed when main storage is addressed
to store data.
The "I/O" setting causes address comparison to
be performed when main storage is addressed by a
channel to transfer data or fetch a channel command
word. Whether references to a channel address word !\lame Typical Implementation Address-Compare Controls Check-Stop Indicator Configuration Controls Display-and-Enter Controls Emergency··Pull Switch Enable·System-Clear Key IMPL ContliOls Interrupt Key*
Load I ndicator*
Load Key*
Load-Un it-Address Controls*
Manual I ndicator* Power-Off IKey* Power-On Key* Rate Control Restart KeV Start Key Stop Key Store-Status Key System I ndicator*
System-Res,et Key
Test I ndicator* Thermal/CB Power Check Indicator TOO Clock key*
Wait I ndicator* Explanatio,!: Rotary switches and toggle switch
2 One or more lights
1 110tary switches, toggle switches, and pushbuttons
Keyboard-printer
2
,3 Pull switch
Pushbutton
2
Pushbutton
2
,3
Pushbutton
2
Light
1
Pushbutton
2
Rotary switches
2
Light
1
Pushbutton
Pushbutton, backlighted
Rotary switch
2
Pushbutton
2
Pushbutton
2
Pushbutton
2 Special keyboard mnemonic
2
, 3
Light
1
Pushbutton
2
Light
1 One or more lights
Spring-return toggle switch
Light
1
* Remote operator control panel, if available, also contains this function.
1 Or the indicator may be on a CRT display.
2 Or the function may be provided by an equivalent keyboard input or a CRT-menu selection.
3 Or the function may be provided by pushbuttons, rotary switches, or both.
Operator Controls 244 Systl!m/370 Principles of Operation