Operating instructions
START, In the automatic mode of operation,
depressing the START pushbutton initiates act-
ion. After the operation begins, the program
runs automatically and despressing the START
switch again has no effect. In the manual mode
of operation, depressing the START switch
causes the execution of one instruction or one
word time, depending upon the setting of the
INST/WORD switch.
A4 I (A to I). This switch is effective only
in the manual mode of operation. Depressing
the
A
to I pushbutton transfers the contents of
the
A
register, including the sign bit, to the
I register. The contents of the A register re-
main unchanged, and can be cleared by tog-
gling the RESET A switch. The A to I switch
is
used to manually load an instruction into the
I register or to correct an instruction already
there.
XAQ.
This switch
is
effective only in the man-
rmode of operation. Depressing XAQ causes
an exchange of information
between the A and
Q
registers. That is, the contents of A go into
Q and the contents of Q go into A. This permits
the operator to observe the contents of the
Q
register. By using the RESET A switch and
the option switches, the operator can clear and
correct the contents of the
Q
register while
saving the contents of the A register.
STOP ON PARITY
ALARM/NORM, This
is
a
two-position, rocker-type switch. It determines
the response of the central processor to the
detection of
a
parity error. When the STOP
ON PARITY ALARM portion of the switch
is
depressed, the central processor halts each
time a parity error
is
detected and the PARITY
and PRIORITY alarm lights come on. When the
NORM (normal) portion of the switch
is
depres-
sed, the central processor continues operation
regardless of parity errors, and the only indi-
cation of a parity error
is
the fact that the
PARITY alarm
light
is
turned on. The setting
of the STOP ON PARITY
ALARM/NORM switch
is
determined by the programmer. If he has
included remedial action throughout the program
to take care of parity errors and to reset the
PARITY alarm light,
he will specify the setting
of the STOP ON PARITY
ALARM/NORM switch
to the NORM position. If he has not included
remedial steps in the program, he will want the
program to halt at time of a parity error,
so
will specify the setting of STOP ON PARITY
ALARM,
Table I contains a summary of the controls and indi-
cators of the maintenance panel and control console.
It
is
recommended that the student operator remove
the table from the manual and keep
it
in
a
handy
place at the console for quick reference.