The leftmost rotary switch has eight positions label
ed0-7. The other two are 16-position rotary switches
labeledwith the hexadecimal characters 0-9, A-F.
Load Key
The load key is pressed to start initial program load
ing, and is effective while power is on the system.Prefix-Select Key Switch
The prefix-select key switch provides the choice be
tween main prefix and alternate prefix during manu
ally initiated initial program loading.
The setting of the switch determines the state of the
prefix trigger following the system reset after the load
key is pressed.
The switch is part of the multisystem feature.
Operato,' Intervention Section
This section of the system control panel contains the
controls required for the operator to intervene in nor
mal programming operation. These controls may be
intermixed with the customer engineering controls,
and additional switch positions and nomenclature may
be included, depending on the model.Operator intervention provides the system-reset and
the store-and-display functions. Compatibility in per
forming these functions is maintained, except that the
word size used for store and display depends on the
physical word size of storage for the model. Switches
for display of the instruction address are absent on
models that continuously display the instruction ad
dress.
The following table lists all intervention controls by
the names on the panel or controls and describes them.
NAMESystem Reset Stop Rate Start Storage Select Address
DataStore Display Set IC
Address Compare
Alterna tePrefix Multisystem feature
System-Re!;et Key
IMPLEMENT A TION Key
Key
Rotary switch
Key
Rotary or key switch
Rotary or key switches
Rotary or key switches
Key
Key
Key
Rotary or key switches
Light
The system-reset key is pressed to cause a system re
set; it is effective while power is on the system. The
reset function does not affect any off-line or shared
device.120 Stop Key
The stop key is pressed to cause theCPU to enter the
stopped state; it is effective while power is on the sys
tem.
Programming NotePressing the stop key has no effect when a continuous
string of interruptions is performed or when theCPU is unable to complete an instruction because of ma
chine malfunction. The effect of pressing the key is
indicated by the turn-on of the manual light as theCPU enters the stopped state.
Rate Switch
This rotary switch indicates the way in which instruc
tions are to be performed.
The switch has two or more positions, depending
on model. The vertical position is markedPROCESS. In
this position, the system starts operating at normal
speed whcn the start key is pressed. The position
left of vertical is markedINSTRUCTION STEP. When the
start key is pressed with the rate switch in this po
sition, one complete instruction is performed, and all
pending, not masked interruptions are subsequently
taken. TheCPU next returns to the stopped state.
Any instruction can be executed with the rate
switch set toINSTRUCTION STEP. Input/output opera
tions are completed to the interruption point. When
theCPU is in the wait state, no instruction is per
formed, but pending interruptions, if any, are taken
before theCPU returns to the stopped state. Initial
program loading is completed with the loading of the
new psw before any instruction is performed. The
timer is not updated while the rate switch is set toINSTRUCTION STEP. The test light is on when the rate switch is not set
toPROCESS. The position of the rate switch should be changed
only while theCPU is in the stopped state. Otherwise unpredictable results occur.
Start Key
The start key is pressed to start instruction execution
in the manner defined by the rate switch.Pressing the start key after a normal stop causes in
struction processing to continue as if no stop had oc
curred, provided that the rate switch is in thePROCESS or INSTRUCTION-STEP position. If the key is pressed
after a system reset, the instruction designated by the
instruction address in the psw is the first instruction
executed. In some models, the start key cannot be
pressed after a system reset until a new instruction
address or psw is introduced by pressing the set IC or
load switch.
ed
labeled
Load Key
The load key is pressed to start initial program load
ing, and is effective while power is on the system.
The prefix-select key switch provides the choice be
tween main prefix and alternate prefix during manu
ally initiated initial program loading.
The setting of the switch determines the state of the
prefix trigger following the system reset after the load
key is pressed.
The switch is part of the multisystem feature.
Operato,' Intervention Section
This section of the system control panel contains the
controls required for the operator to intervene in nor
mal programming operation. These controls may be
intermixed with the customer engineering controls,
and additional switch positions and nomenclature may
be included, depending on the model.
the store-and-display functions. Compatibility in per
forming these functions is maintained, except that the
word size used for store and display depends on the
physical word size of storage for the model. Switches
for display of the instruction address are absent on
models that continuously display the instruction ad
dress.
The following table lists all intervention controls by
the names on the panel or controls and describes them.
NAME
Data
Address Compare
Alterna te
System-Re!;et Key
IMPLEMENT A TI
Key
Rotary switch
Key
Rotary or key switch
Rotary or key switches
Rotary or key switches
Key
Key
Key
Rotary or key switches
Light
The system-reset key is pressed to cause a system re
set; it is effective while power is on the system. The
reset function does not affect any off-line or shared
device.
The stop key is pressed to cause the
stopped state; it is effective while power is on the sys
tem.
Programming Note
string of interruptions is performed or when the
chine malfunction. The effect of pressing the key is
indicated by the turn-on of the manual light as the
Rate Switch
This rotary switch indicates the way in which instruc
tions are to be performed.
The switch has two or more positions, depending
on model. The vertical position is marked
this position, the system starts operating at normal
speed whcn the start key is pressed. The position
left of vertical is marked
start key is pressed with the rate switch in this po
sition, one complete instruction is performed, and all
pending, not masked interruptions are subsequently
taken. The
Any instruction can be executed with the rate
switch set to
tions are completed to the interruption point. When
the
formed, but pending interruptions, if any, are taken
before the
program loading is completed with the loading of the
new psw before any instruction is performed. The
timer is not updated while the rate switch is set to
to
only while the
Start Key
The start key is pressed to start instruction execution
in the manner defined by the rate switch.
struction processing to continue as if no stop had oc
curred, provided that the rate switch is in the
after a system reset, the instruction designated by the
instruction address in the psw is the first instruction
executed. In some models, the start key cannot be
pressed after a system reset until a new instruction
address or psw is introduced by pressing the set IC or
load switch.