Operating instructions
SETUP PROCEDURES
Setting up the central processor for operation involves
only bringing power up and setting control switches.
The six steps listed below are designed to save data
in the core memory of the central processor. If the
console was previously shut down by the normal pro-
cedure and switches have not been disturbed, steps
2
and
3
require only verification. Some operators
form the habit of checking switches both visually and
physically by actually pressing
a
switch even though
it appears to be in position already. Thus, good habit
patterns are formed. (EXCEPTION: Don't hit PWR
ON when already on, except when performing special
procedures
as
described later.)
1.
Verify that blowers in central processor
cabinets are operating. (If not, call the
service engineer.)
2. Set the
AUTO/MANUAL switch to the
MANUAL position.
3.
Set the
INSTR/WORD
switch to the INSTR
position.
4.
Depress the PWR ON switch.
5. Set the
INSTR/WORD
switch to the INSTR
position.
6.
Depress the RESET ALARM switch (this
can be done either at this time or just
,
pricr to starting a program.)
The complete procedure for starting up and shutting
down the central processor and the entire GE-225
System
is
described in Section 111.
MANUAL OPERATING PROCEDURES
The option switches
on
the control console permit the
operator to
enter instructions and data manually;
the register display lights permit the reading of the
contents of
memory and of certain registers. Thus,
it
is
possible to feed in and execute a short program
and read the results. Manual loading
is
used most,
however, for getting a
program started, correcting
memory,
brz nching, setting and clearing special
modes, and reproducing damaged cards.
Once an
operator completes the necessary manual operations
and gets a program started, control of operations
is
usually transferred to the central processor.
Loading an Instruction Manually
Any instructiori that
is
intelligible to the GE
-225
can be loaded manually by putting the octal equiva--
lent of the instruction into the A register, as follows:
1.
Set the
AUTO/"MANUAL
switch to the
MAKUAL position.
2.
Set the INSTR/WORD switch to the INSTR
position.
3.
Toggle the RESET A switch to clear the
k
register.
4.
Load the octal equivalent of the instruction
into the
A
register. (See instructions for
toggling option switches in the previous
section.)
5.
Depress the A to I switch.
6.
Toggle the RESET
A
switch and load any
necessary data into the A register.
(Not
necessary for
some instructions.)
7.
Depress the START switch.
The central processor
will
then execute the instruc-
tion placed in the I-register by the operator.
The following are the most used instructions, and must
be
nlemorized as quickly as possible.
Mnemonic Description Octal Code
TON
RON
WCD
WCB
WCF
RCD
RCB
RC
F
BRU
SET DECMODE
SET
BINMODE
SXG
Y
ST
A
LDA
OFF
Typewriter
011
Paper. 'l'ape Reader
On
Paper. Tape
Purich
On
W
rile Card
Do(li111a1
Write
Car6
Binary
Write Card Full
Read Cards Bec,inlal
Read Cards Binary
Read Cards
Full
Branch Uncondi-
tionally
Set Decimal Mode
Set
Binary &lode
Select Index Group
Store
A
Load
A
Input, Output Off
Loading Data Manually
When data
is
to be loaded into memory, the fol-
lowing procedure
is
followed:
1.
Set the AUT0;MARUAL. switch to the
MAN
UAL position.
2.
Set the IKSTR/WORD
switch
to the INSTR
position.