Operating instructions

a parity alert is detected during a produc-
tion run, the central processor halts and all
peripherals halt
aft,er conlpleting their
latest instruction.
At this time it
is man-
datory that the operator consult the oper-
ating instructions (run book) before doing
anything to the equipment. It will usually
be necessary to return the
progsarrl to the
nearest restart point. The occurrence of
a parity alert in the central processor
indicates that erroneous information
is pre-
sent. To depress the RESET ALARM and
continue the program
is apt to produce
incorrect results. The RESET ALARM
switch resets the overflow flip-flop and the
carry flip-flop, and these could compound
the problem rather than remedy it.
The procedure for resetting a PARITY
alarm in
a location other than at the begin-
ning of
a program is as follows: (See
Section XVI for an explanation of the
meaning and use of memory resetters.)
1.
Set the AUTO/MANUAL switch to
MANUAL.
2.
Set the STOP ON PARITY ALARM/
NORM switch to NORM.
3. Put a memory resetter, followed
by
2 blank cards, into the input
hopper of the card reader.
(8K
or 16K depending on the size of
the central processor, and either
a zero or a minus resetter.)
4.
Depress the LOAD CARD switch.
5. Depress the RESET ALARM swi-
tch.
6.
Depress the LOAD CARD switch.
7. Depress the RESET P switch.
8. Set the ISUTO/MANUAL switch to
AUTO.
9. Depress the START switch. (Re-
setter will now clear memory.)
10.
After menlory has been cleared and
the central processor stops, set the
ATJTO/MANUAL switch to MAN-
UAL.
11. Engage the STOP ON PARITY
ALARM switch.
12. Depress the RESET ALARM swi-
tch which
4hould cause the PARITY
alarm light to go out.
13.
If the above steps do not clear the
parity error condition, call the
service engineer.
Starting the Program
Most operators are principally concerned with only
three types of program input: cards, magnetic tape,
and paper tape. The procedures for starting
a pro-
gram from each of these types of input are described
in this section.
Before loading the program into
nlenlory, the operator
should check the
progranlnler's i~lstructions to see
what kind of
memory resetter to use, if any.
Memory Resetters.
Two types of memory resetters
are often used. These are zero resetters and minus
resetters.
There are advantages
arid disadvantages
to both types,
The zero memory
resetter resets Jueniorv loc:rtions
to zeros. This resetter is ha~ldy when a zflro-.delete
memory dump is used, for it saves time arid paper
when printing out the contents of memory. The oger-
ator may use the zero resetter, then load a prcjgr'am
and start running. If the machine should jwny out
of sequeace for any reason, it
may land in a location
with all zeros, which
is an LDA instruction. It will
then proceed to continue loading the
A reqister until
it comes back around to the program.
It may enter
the program at the
wrongplace andabort the program.
Some Service Routines such
as the ~nput,'~utput
routines require a SPB resetter.
The minus resetter sets all memory locations with
ones. If the central processor accidentally jumps out
of sequence during a run when memory has been
reset with
a minus resetter, the machine will either
jump into another part of the program or land in
a
location with all ones.
Since all ones
is a 37 which
is an illegal instruction on most models, the central
processor will halt.
Card Input.
Procedures for loading cards into mem-
ory depend on whether the cards contain a program
or-
merely data for use after the program is already
loaded into memory. Assume that power
is on to the
central processor, the
INSTR/WORD switch is set to
INSTR, and the card reader has been made ready.
The following steps apply to the
400 card per minute
reader.
The following procedure loads aprogram
deckof cards
into memory.
The
first card must be a loader card
punched -in binary format and the last two cards must
be blank.