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and Encoder. AY-5-2376 Datasheet

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and Encoder. AY-5-2376 Datasheet
















AY-5-2376 Encoder. Datasheet pdf. Equivalent













Part

AY-5-2376

Description

Keyboard and Encoder



Feature


www.DataSheet4U.com KEYBOARD and ENCODE R 219 W. Rhapsody, San Antonio, Texas 78216 1 KBD-5 KEYBOARD General Descri ption The KBD-5 keyboard and ASCII enco der utilizes a single MOS integrated ci rcuit to perform the bulk of all necess ary operations to generate full 8 bit p arallel ASCII output code complete with a parity bit for error detection. Debo unce is internal a.
Manufacture

Swtpc

Datasheet
Download AY-5-2376 Datasheet


Swtpc AY-5-2376

AY-5-2376; nd automatic and choice between positive or negative keypressed output strobe i s provided. The keyboard can be program med for upper case characters only, or upper and lower case characters. The KB D-5 has the features of n key lockout a nd 2 key rollover to help in reducing t yping errors. Once a key is pressed pre ssing other keys will have no effect un til the first key .


Swtpc AY-5-2376

is released. The KBD-5 is already progra mmed for the control functions LINE FEE D, RETURN and ESCAPE and can easily be programmed for other control www.DataSh eet4U.com functions. The keyboard also has two SPST locking keyswitches which can be used for turning the RECEIVE, TR ANSMIT and ECHO functions of a terminal such as the CT-1024 on and off. The ke yboard also has an.


Swtpc AY-5-2376

automatic repeat function which causes a string of characters to be transmitte d after a key has been depressed for mo re than about 0.5 seconds. Assembling y our Keyboard and ASCII Encoder NOTE: MO S integrated circuits are susceptible t o damage by static electricity. Althoug h some degree of protection is provided internally within the integrated circu its, their cost de.





Part

AY-5-2376

Description

Keyboard and Encoder



Feature


www.DataSheet4U.com KEYBOARD and ENCODE R 219 W. Rhapsody, San Antonio, Texas 78216 1 KBD-5 KEYBOARD General Descri ption The KBD-5 keyboard and ASCII enco der utilizes a single MOS integrated ci rcuit to perform the bulk of all necess ary operations to generate full 8 bit p arallel ASCII output code complete with a parity bit for error detection. Debo unce is internal a.
Manufacture

Swtpc

Datasheet
Download AY-5-2376 Datasheet




 AY-5-2376
www.DataSheet4U.com
KEYBOARD
and
ENCODER
219 W. Rhapsody, San Antonio, Texas 78216
1




 AY-5-2376
KBD-5 KEYBOARD
General Description
The KBD-5 keyboard and ASCII encoder utilizes a single MOS integrated
circuit to perform the bulk of all necessary operations to generate full 8 bit
parallel ASCII output code complete with a parity bit for error detection.
Debounce is internal and automatic and choice between positive or negative
keypressed output strobe is provided. The keyboard can be programmed for upper
case characters only, or upper and lower case characters. The KBD-5 has the
features of n key lockout and 2 key rollover to help in reducing typing errors.
Once a key is pressed pressing other keys will have no effect until the first
key is released. The KBD-5 is already programmed for the control functions LINE
FEED, RETURN and ESCAPE and can easily be programmed for other control
www.DataSheet4U.cfoumnctions. The keyboard also has two SPST locking keyswitches which can be used
for turning the RECEIVE, TRANSMIT and ECHO functions of a terminal such as the
CT-1024 on and off. The keyboard also has an automatic repeat function which
causes a string of characters to be transmitted after a key has been depressed
for more than about 0.5 seconds.
Assembling your Keyboard and ASCII Encoder
NOTE: MOS integrated circuits are susceptible to damage by static
electricity. Although some degree of protection is provided internally within
the integrated circuits, their cost demands the utmost in care. Before opening
and/or installing any MOS integrated circuits you should ground your body and
all metallic tools coming into contact with the leads through a 1M ohm 1/4 watt
resistor (supplied with the kit). The ground must be an "earth" ground such as a
water pipe, and not the circuit board ground. As for the connection to your
body, attach a clip lead to your watch or metal ID bracelet. Make absolutely
sure you have the 1M ohm resistor connected between you and the "earth" ground,
otherwise you will be creating a dangerous shock hazard. Avoid touching the
leads of the integrated circuits any more than necessary when installing them
even if you are grounded. On those MOS IC's being soldered in place, the tip of
the soldering iron should be grounded as well (separately from your body ground)
either with or without a 1 Meg ohm resistor. Most soldering irons having-a three
prong line cord already have a grounded tip. Static electricity should be an im-
portant consideration in cold, dry environments. It is less of a problem when it
is warm and humid.
( ) Install the 14 jumpers on the PC board. Use some of the light gauge wire
supplied with the kit or excess resistor leads. On the longer jumpers use
insulated wire to keep the jumper from shorting to other components.
Jumpers are denoted on the circuit board by solid lines connecting two
pads. As with all other component installation, unless otherwise noted,
pull the jumpers down flush with the circuit board and solder.
( ) Install the resistors and capacitors on the circuit board using the
component layout on the board and the parts list. Bend the leads over on
the back side of the board and trim so that 1/16" to 1/8" of lead remains.
Solder.
Scanned and edited by Michael Holley Mar 02, 2002 Revised May 23, 2003
Southwest Technical Products Corporation Document Circa 1975
1




 AY-5-2376
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www.DataSheet4U.com
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Install integrated circuits IC2-IC3 on the board, Be sure to orient the
IC's as shown on the board and do not bend the leads on the back side of
the board. Doing so makes it very difficult to remove the IC should
replacement ever be necessary. Do not install IC1 at this time. Solder.
Install the transistor and diodes on the board. Leave about 1/4" clearance
between the transistor body and the circuit board. Be sure to orient the
components exactly as shown on the component side of the board. Solder.
Check the key switches with an ohmmeter before they are installed to be
sure that they are making contact properly and to be sure that they do not
stick. Solder the switches in place one at a time using as little heat as
necessary to get a good solder joint. Note that the keyswitches for the
RCVE/XMIT and ECHO positions are a SPST switch and are different from the
rest. The switches can be recognized by pressing each keyswitch. The SPST
switches will have a locking position. Install these two switches first.
Be careful not to force any switch into a hole in such a way as to damage
the connecting wires. Excessive heating can distort, or even melt the
plastic body and ruin the keyswitch. Check the switch again with an
ohmmeter for proper operation after soldering it in place. This can save
much troubleshooting later. If the switch works properly heat stake the
switch in place by melting over the ends of the plastic mounting bosses.
This can be done with the tip of your soldering iron.
After all keyswitches have been installed and checked you are ready to
install the programming strips on the bottom of the board. These strips
mount vertically, at right angles to the main board. The etched finger,
connection points on the programming strips will match the connection pads
on the main board when the strips are in the correct position. Hold one of
the strips in the correct position and turn it so that the connection
fingers match the pads on both sides of the strip. Note that there are two
ways the strip may be turned and only one is correct. If the strips edge
is too rough to fit down solidly against the main board, file, or sand
that edge flat. Hold, or clamp sides of the strip to the main board, pads.
Install the other strip in the same way. Both strips are identical.
The spacebar and equalizer assembly goes together as follows. Mount a
keyswitch on the board in the center of the spacebar area. Mount the two
"L" shaped brackets with a notch in the top on each side of the keyswitch
in the holes provided. The side of the bracket with the notch should be
next to the circuit board edge. These should be fixed in place by melting
and flattening slightly the plastic pins on the back of the board with
your soldering iron tip. Press one of the equalizer wire retainers into
place on the end of the spacebar itself. The hole for the wire should be
on the more slanted side of the spacebar that has the four casting bumps.
Slip the equalizer wire into the hole in, the retainer you have not yet
pressed into place. Press the second retainer into place. Turn the
spacebar upside down in front of the board and press the equalizer wire
into the notches in the top of the mounting clips. Turn the spacebar over
and position it over the keyswitch in the center of the board. Press it
down into place.
2




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