Netronics ASCII -A2 User manual

ASCII -A2
ASSEMBLY
INSTRUCTIONS
SPECIFICATIONS
Power
Requirements:
+5V
&
-12V
DC
or
+5V
DC
&
6.3
to
8V
AC
Full
128
character
ASCII
set
2 key rollover
Upper and lower case
Selectable parity
Positive or negative logic output
Shift lock key
G-10 glass expoxy printed circuit board
Connects to any 8-bit parallel I/O port
Alpha lock jumper (permits upper case only operation)
Drive capability (one TTL load)
NETRONICS RESEARCH AND DEVELOPMENT LIMITED
~\\ 333 LITCHFIELD ROAD (RTE. 202) NEW MILFORD, CONNECTICUT 06776
[phone] |
REVISION C

(
)
)
-0015 Disc Capacitor
ASCII KEYBOARD
ASSEMBLY INSTRUCTIONS
Check all parts in your kit against the following list.
Description Quantity
KR2376-012 (Decoder IC)
IN4001 (Diode)
IN4742A (12V Zener Diode)
P.C. Board KB-2
150 ohm Resistor (Brown, Green, Brown)
4.7K Resistor (Yellow, Violet, Red)
680K Resistor (Blue, Gray, Yellow)
100K Resistor (Brown, Black, Orange)
56, 60 or 68pf Disc Capacitor
LOOMFD/16V Capacitor
40 Pin Socket
Momentary Switches
Latching Switch
Space Bar
Return Key
Miscellaneous Key Caps (as per drawing)
Cable Assembly 3
6" 14 lead ribbon cable with two 14 pin.
connectors supplied with terminal package.
O1
ul
BPE H HOE NORE EEE OEE PE NE
3°14" ribbon cable with two 14 pin connectors
supplied with stand alone ASCII keyboard.
6 32x3/8" Screw 3
6 32 Nut 3
Optional Price
Deluxe Steel Cabinet (blue & black)$19.95 + $2.50 P&H
(Refer to Keyboard Assembly Figure)
DO NOT INSTALL IC UNTIL POWER CHECK HAS BEEN MADE
1. Install 40 pin IC socket at location U-l. (Solder).
2. Install key switches. Note: Solder one lug only. The second
lug will be soldered after the key caps have been installed
and straightened. The shift lock key is the latching type
Switch and should be installed first. Note that two momentary
Switches are used for the space bar.
3. Install key caps.
4. Check alignment of keys and straighten keys by heating solder
connection and repositioning switches. Carefully check space
bar action.

(
5. Solder remaining unsoldered switch lugs.
6. Install resistor R-1 150 ohm (brown, green, brown). Solder.
7. Install resistor R-2,3, 4.7K (yellow, violet, red). Solder.
8. Install resistor R-4 680K (blue, gray, yellow). Solder.
9. Install resistor R-5 100K (brown, black, yellow). Solder.
)10. Install diode CR1, CR2 (IN4001). NOTE: Band must face as per
assembly drawing.
)ll. Install diode CR3 (IN4742A). NOTE: Band must face as per
assembly drawing.
)1l2. Install C-2 .0015disc capacitor. Solder.
)13. Install C-4 56pf, 60 or 68pf disc capacitor. Solder.
)14. Install C-1,3 100uf capacitors. Note polarity. Solder.
)
)
JUMPER SELECTION
If you are using the ASCII keyboard with your ELF II or Explorer 85,
connect jumpers as follows. If you are using a different computer,
check the jumper table and connect as per your requirements.
Connect J2, J4. Solder. Note no parity signals are used on ELF II.
or Explorer. :
JUMPER TABLE
Jl - LOGIC |J3 UPPER & LOWER CASE| J5 ODD PARITY
J2 + LOGIC |J4 UPPER CASE ONLY J6 EVEN PARITY
Solder
ribbon
cable
assembly
at
location
Pl
as
per
assembly
drawing.
Note
pin
#1
must
be
positioned
as
shown.
(A
socket
could
be
used
if
desired).
| ,
The
Netronics
ASCII
keyboard
can
be
used
with
any
number
of
computer
applications.
When
using
this
product
with
a
Netronics
computer
the
following
modifications
should
be
made
to
the
computer
to
facilitate
a
more
convenient
installation.
1.
When
using
the
ASCII
keyboard
ASCII
-
A2
with
a
Netronics
Video
Display
Board
make
the
following
modifications
to
your
Video
Display
Board.
Using
30
gauge
insulated
jumper
wire
connect
the
Jumper
between
J2
pin
7
and
U-4
pin
8.
Connect
an
insulated
jumper
between
J2
pin
8
and
U-4
pin
16.
Connect
the
jumper
between
J2
pin
9
and
the
-12V
terminal
at
the
edge
of
the
Video
Display
P.C.
Board.

-
Referring
to
the
interconnection
diagram
on
page
6
of
your
Video
Display
Board
manual
please
note
that
the
-12
and
the
ground
connections
between
the
Video
Display
Board
and
the
ASCII
keyboard
is
no
longer
required.
These
connections
are
now
made
via
the
14
pin
ribbon
cable.
3
2.
When
using
the
ASCII
keyboard
with
the
ELF
II
Giant
Board
make
the
following
modifications
to
your
Giant
Board.
Remove
the
jumper
or
diode
from
CR1.
Add
a
jumper
from
Al6
pin
8
to
AS5
pin
24.
Add
a
jumper
from
Al6
pin
7
to
All
pin
8.
Connect
the
3'
ribbon
cable
between
the
Giant
Board
and
ASCII
keyboard.
Connect
AC
supply
(6.3
to
8V
AC)
to
AC
input
on
the
ASCII
keyboard.
Observe
the
ground
polarity
if
you
are
uSing
the
Netronics
power
supply.
POWER
SUPPLY
TEST
(DO
NOT
INSTALL
U-1
YET)
Check
all
soldering
and
components
for
proper
value.
2;
Connect
the
ASCII
to
your
system.
1.
Measure
the
DC
voltage
at
pin
#1
&
18
of
socket
U-1.
The
voltages
should
be
+5V
&
-12V
respectively.
They
should
read
within
5%
of
the
specified
values.
Do
not
proceed
to
install
the
IC
if
the
voltage
is
improper.
2. Disconnect the power supply.
3.
install,
I¢G-1.
Note
location
of
pin.
#1.
WARRANTY
All
of
the
components
supplied
in
this
kit
are
under
warranty
for
Six
months
from
the
date
of
purchase.
Any
parts
suspected
to
be
defective
should
be
returned
to
Netronics
with
$1.00
for
postage
and
handling.
They
will
be
tested
and
returned
postpaid.
IN CASE OF DIFFICULTY
In
the
event
of
difficulty,
check
all
wiring
against
the
instruc-
tions.
Check
for
solder
bridges
and
all
component
values.
If
you
still
cannot
determine
the
problem,
return
the
defective
printed
circuit
board
ONLY.
Please
enclose
a
check
or
money
order
for
$7.00
and
pack
the
board
securely,
and
insure
the
parcel.
Your
unit will
be
tested
and
returned
insured
and
postpaid.
Mailing
address:
NETRONICS
RESEARCH
&
DEVELOPMENT
LIMITED,
333
Litchfield
Road,
Rte.
202,
New
Milford,
Connecticut
06776,
Attention:
Service
Department.

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SCHEMATIC, KEYBOARD