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Installation
and
Specifications
SEGMENT
SELECT
AND
REPLACE
BATTERY*
CONNECTIONS
Two
signals
are accessible
at
the
front
edge
of
the card.
.
One
is
Segment
Select, for
multiple
memory
banks,
and
the
other
is
Replace
Battery*,
to
indicate
when
the battery
is
low.
The
location
of
these connectors
is
shown
in
Fig. 2-2.
They
are two-pin connectors,
having
0.025" pins
on
0.1" centers.
Each
connector has &
signal
and
a
ground
line.
A
twisted
pair
cable,
such
as Pro-Log's
RC704
cable,
should
be
used
lor
connection
to
other
cards.
The Segment
Select
signal
can be
driven
by
a
TTL
output
line,
such
as
that
provided on
Pro-Log's
7605
card, or
any
spare
TTL
output
lines
available
in
your system
(see
Fig. 2-3).
The
Replace
Battery" signal
may
be connected
to
an
input
line,
such
as
that
provided on
the
7605,
or
to
a priority
inter-
rupt
controller,
such
as Pro-Log's
7320
card. Pro-Log's
7801
processor card
has
interrupt
inputs,
and
the
7804
processor
card has
a
TTL
input
to
which
the
Replace
Battery* signal
may
be connected
(refer to
Fig. 2-4).
J
j)
MM
2
j)
SW3
4th 4
K
WRITE
INHIBIT
|$2
SWITCHES
SW0
161
IK
WRITE
INHIBIT
=
OFF
OR OPEN
GROUND
SIGNAL
SEGMENT
SELECT
GROUND
REPLACE
SIGNAL
BATTERY
REPLACE BATTERY
LED
BATTERY
LOW
=
LED
ON
W1
[oooonn
8K
VERSION
OOOOOO
OOOOOO
HI
OOOOOO
CM
oooooooJ
2K VERSION
W*-N0
JUMPER
INSTALLED
AS
SHIPPED
V-
JUMPER
INSTALLED AS SHIPPED
N
—
INDICATES
PIN
1
Figure
2-2.
7706 Location
of
Main
Features
2-2
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