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Figure 54.
Register Display
and
Selector
tiply operation. During divide, the Multiplier/Quo-
tient
(M/Q)
register is used to develop
quotient
digits.
Memory Address Register
(MAR)
.
Five lines,
each
with
five indicator lights, display the bit
configuration
of
the five-digit
address
in
anyone of
the twelve
MARS
registers. The
specific
register displayed is
se-
lected by the
1AR
Display Selector
switch and
the
Display
MAR
key. There is no flag bit notation.
M
emory
Address Register Storage
(MARS)
Display
Selector. The 12-position rotary
switch
permits
any
of the 12
MARS
registers to be
selected
for display in
MAR
by pressing the Display
MAR
key. The position
of the
switch can
be
changed without altering
the
display. The rotary
switch should
not be turned how-
ever, while
the Display
MAR
key is depressed.
The
MARS
registers provide
a visual
indication of
internal data flow for the console
operator.
Further
information on the use of individual registers
and
the
60
_Iii=;;;;;iiiiii_,
\
incrementing
and
decrementing
of
the
MAR
addresses
may be
found
under 1620
INSTRUCTIONS,
CO
'
SOLE
OPERATING
PROCEDURES,
Appendix
C,
and
PROGRAM
TESTING.
Control Gates Lights
The Control Gates lights
(Figure
55) are used pri-
marily
by Customer Engineers for diagnostic testing.
Those listed below however, may be used during
manual
Single Cycle Execute
(SCE)
key
operation of
the
instructions.
H/P
(High/Positive).
The
H/P
light
shows
the condi-
tion of the internal
H/P
indicator as
a
result of the last
arithmetic or compare
operation.
E/Z
(Equal/zero).
The
E/Z
light shows the
condition
of the internal
E/Z
indicator as a result of the last
arithmetic or compare
operation.
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