Operating instructions

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the index groap that has been selected by the program

(Groups

through

1).

Each group has four registers,

through

When all lights are off, group zero

available without special selection. Only index groclp

zero

standard on the GE-225 System; additional

groups are optional. Any time a light

on in the

index group,

the

o2erator knows that an index grmp

other than zero has been selected.

Counter Lights. The fifteen display lights for the

counter are located to the right of the INDEX

GROUP indicators. They are n~mbered, left to right,

from

through 19, and are arranged in groups of

three to facilitate reading the binary

numl~ers in their

octal representation. By reading these groups, the

oilerator can know the location of the instruction

which appears in the

counter

useful wnen debugging a program and when checking

for correct operation after a manual branch

comrnand

to a particular program location.

SAVE:

Switch. This switch permits the operator

to return to a particular position in theprogram after

he has interrupted it to make a correction, such as to

introduce an instruction manually. The SAVE

switch in the downpositionprevents the

counter from

incrementing. When the operator returns the SAVE

switch to the up (normal) position after manual

operations, the program

ready to continue from the

plaze of interruption. When the SAVE

switch

the

dowa position during the automatic mode of oper-

ation, the instruction in the I register is executed

over and over again.

are

lozated below the

INDEX

GRa3P

and

counter

lights, and are

number from

to 19. They display

the contents of the instruction register. Like the

other register display lights, they are read in their

octal representation. The I register displays the

current instruction,

the instruction that has not yet

been executed or has been only partly executed.

A Register Lights. The 20

are

located below the

[-qp$[q

ALARM

MANUAL

numbered from 0 to 19, and display the contents of

the A register. These are

als~

read in octal. By

using the

XAQ switch (described

later),

the

reg-

ister lights can be used to display the contents of

the

m2.nually into the central processor go through the

Optiojn Switches.

The 20 option switches just below

the

mation into the A register. Each of these toggle

switches enters information into the corresponding

A register position. The numbers

through

below the

also applying to the switches. When moved up, the

switches are spring loaded and return automatically

to the center '(normal) position. When moved down,

they

remain in the down position until manually

returned to the norm21 positio2.

W!len the central processor

in the manual mode of

operation, moving

option switch up causes

one

put into the corresponding position of the

indicated

light. Moving an

option switch up has

effect when

the central processor is in the automatic mode of

operation.

Moving an option switch

dow!~ w!len the central proces-

s:lr

in the automatic mode causes a one to be put

into the corresponding position of the A register at

the time of a programmed RCS instruction. Specified

switches are left in the

daw~i p~sition while running

certain

rodtines and while generating GAP assem-

blies. These and other special uses of the option

switches are specified in the

program~ner's instrac-

tions to the operator.

RESE'i'

ASwitch. This switch

to the left of the

option switches. It is effective only

w!len the central

processor

in the mawal made of operation. Like

the option switches, it is spring loaded in the up

pgsition but not in the down position. When moved

either up or

down,

it clears to zero the contents of

the

display lights. When the operator

makes a mistake

while using the option switches, he can correct this

OFF

Figure

IV-4.

Control Switches on the Control Console

STOP

PARITY

ALARM