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B.
CONTROL/MAINTENANCE PANEL
The full panel allows the DPU register and
main
memory
contents
to'
be
entered
and
displayed.
It controls, in a step—by-step
fashion,
the DPU intialization sequence.
REGISTER DISPLAY
A six—digit hexadecimal
(hex)
display in
the
upper
part
of
the
panel
marked
REGISTER indicates the two-digit LOCATION
and four-digit CONTENTS of any one of the
various uSer—visible registers.
HEXADECIMAL-PAD KEYS
The
set
of
16
hexadecimal
keys
in
the
REGISTER
right part of
the control panel marked
°" 33%" se'cusfm
REGISTERS
is called
the hex pad.
These
registers.
In the select mode, a hex pad
key—in
selects
the
register
to
*be
a
operated on and the entered digits light
up
under
LOCATION
in
'the . register
display;
In the change mode,
a hex pad
keyein
changes
the
contents
of
the
selected register and the entered digits
light up under CONTENTS in the register
display;
Each keystroke shifts and loads
one
hexadecimal
digit
into
the' leaSt
significant hexadeximal pOSition of
the
selected regiSter and the display.
CONTROL
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