Operating instructions
3. Toggle the RESET A switch.
4.
Load an STA instruction in the A register
(Store
A
is
an octal 0300000), with the
memory address where the data is to be
stored replacing the
13
righthand bits
of the STA instruction.
5.
Depress the A to I switch.
6.
Toggle the RESET A switch.
7.
Load the octal equivalent of the data to
be
stored into the A register.
8.
Depress the START switch.
Load additional words by repeating steps
3
through
8.
Manual Branching
Prior to executing
a
program, the operator may per-
form such manual operations
as
checking memory,
feeding constants into the memory, or correcting
memory. To then transfer to automatic operation,
the operator must manually enter a branch instruc-
tion which contains the location of the first instruction
to be executed. This
is
done
as
follows: (Power
is
on and the
INSTR/WORD
switch
is
in the INSTR posi-
tion.)
1.
Set the
AUTO/MANUAL
switch to theMAN-
UAL position.
2. Toggle the RESET A switch.
3.
Load a BRU instruction into the A register
(octal 26 in positions
0 through
4
and the
memory location of
first
instruction to be
executed in positions
7
through 19).
4.
Depress the
A
to I switch.
5.
Set the
AUTO/MANUAL
switch to the AUTO
position.
6. Depress the START
switch,
If the operator wishes to branch and remain in manual
mode, he may use the above procedure omitting Step
5
(that
is,
leave
AUTO/MANUAL
switch in MANUAL
mode). If the operator branches to the first instruction
of
a
stored program, one instruction
is
executed each
time the START switch
is
pressed.
Entering and Leaving Upper Memory
In order to get into upper memory (memory loca-
tions 8192 and above),
it
is
necessary to use
a
basic
branch instruction modified by index register
1,
2,
or 3. The index register must contain
a
constant
of
8192 (decimal). The octal equivalent of 8192
is
0020000, which means that bit position six
is
turned
on and
all
others are turned off. Thus, any time bit
position six
is
on in the
P
counter indicator lights,
the operator will know the central processor
is
in
upper memory.
The following steps transfer operations to upper
memory:
1.
Set the
AUTO/MANUAL
switch to the MAN-
UAL position. (It
is
assumed that the
INSTR switch
is
engaged).
2. Set a Store
A
instruction into the A regis-
ter. (STA
is
an octal 030000X, where
X
is
1,
2, or
3
for the index register).
3.
Depress the
A
to I switch.
4.
Toggle the RESET
k
switch.
5.
Set an octal 0020000 into the A register.
6. Depress the START switch. (Stores con-
stant into index register selected).
7.
Toggle the RESET
A
switch.
8.
Set into the
A
register
a
BRU to
the
de-
sired memory location modified by the
selected index register used in step 2,
above.
9. Depress the START switch.
To transfer from upper memory to lower mem-
ory, follow the above steps, except step
5.
The effect then
is
that step 6 (START) stores
zeros into the index register being used.
Reproducing Individual Cards
In an emergency, it may be necessary to reproduce
a
single card. The following describes
a
quick method
of doing this with manual instructions. It
is
assumed
that the card punch
is
ready for operation and that
its
input hopper
is
loaded with blank cards.
1.
Feed the card to be reproduced into the
feed rollers of the card reader to position
it
on the sensing platform.
2. Set the
AUTO/MANUAL
switch to the MAN-
UAL position.
3.
By using option switches, set
a
read-card
instruction into the A register: