Netronics ASCII-A User manual

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FOR USE WITH NETRONICS VIO VIDEO BOARD
Ase · · 11
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ASSEMBLY INSTRUCTIONS
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SPECIFICATIONS
Power Requirements: 6.3 -8V AC or +5, -12V DC
Full 128 character ASCII set
2 key rollover
Upper and lower case
Selectable parity
Positive or negative logic output
Shift lock key
G - IO 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
(203) 354 - 9375

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ASCII KEYBOARD
ASSEMBLY INSTRUCTIONS
Check all parts in your kit against the following list.
Description
Quantity
Momentary Switches
Latching Switch
Switch Caps as per parts layout
Space Bar Wire Form
Space Bar Wire Form Holder
Screw #4 x 3/8"
Nut #4
Wire Form Mounting Yoke
Printed Circuit Board
40 Pin Socket
Ribbon Cable Assembly with 14 Pin Dip Headers (6")
Diode IN4001
IC-1 KR2376-0l2
Ql UA79Ml2 (-l2V Regulator)
Q2 LM340T or 7805 (+5V Regu,a~r) ,
C-2 .00luf Mylar Capacitor/)GJ~
C-3 .047uf Mylar Capacitor
C-4 lOuf Electrolytic Capacitor
C-5 56pf or 68pf Disc Capacitor
C-6,7 47uf Electrolytic Capacitor
C-8 lOOuf Electrolytic Capacitor
R-2,3 Resistor 4.7K (yellow, violet, red)
R-4 Resistor 680K (blue, gray, yellow)
R-S Resistor lOOK (brown, black, yellow)
R-6 Resistor lOK (brown, black, orange)
5S
1
56 + space bar
1
2
2
2
I
1
1
1
3
1
1
1
1
1
1
1
2
1
2
1
1
1
tional
Price
Deluxe Steel Cabinet (IBM blue & black) 2.50 P&H
(Refer to Keyboard Assembly Figure)
DO NOT INSTALL IC's UNTIL POWER CHECK HAS BEEN MADE
() 1. Mount wire form mounting yoke on top side of P.C. board. Use 2 #4 screws
and nuts.
() 2. Install 40 pin IC socket at location IC-l. (Solder)
() 3 . Install key switches. Note: Solder one lug only. The second lug will be
soldered after the key caps have been installed and straightened. There
are three possible sets of holes for the RETURN key switch. Use the center
set of holes. The shift lock key is the latching type switch and should be
installed first.
() 4. Install key caps (do not install space bar yet).
() 5. Check alignment of keys and straighten keys by heating solder connection
and repositioning switch.
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() 6. Solder remaining unsoldered switch lugs.
() 7. Install the two space bar wire form holders into the end slots on the
bottom of the space bar. The holes must face the middle of the space bar.
() 8. Install the wire form into the mounting yoke on the P.C. board, as shown.
() 9. Install the space bar on the key switch. Then insert the wire form into
the wire form holder on the space bar.
( ) 10. Install resistor R-2,3, 4.7K (yellow, violet, red) ~ (Solder)
( ) 11. Install resistor R-4 680K (blue, gray, yellow). (Solder)
( ) 12. Install resistor R-5 lOOK (brown, black, yellow). (Solder)
( ) 13. Install resistor R-6 10K (brown, black, orange). (Solder)
( ) 14. Install diode CR1, CR2, CR3 (IN4001). NOTE: Band must face as per assembly
drawing.
( ) 15. Install Q1 (UA79M12), as shown. (Solder)
( ) 16. . Install Q2 (LM340T or 7805), as shown. (Solder)
( ) 17. Install C-2 .001 Mylar capacitor. (Solder)
( ) 18. Install C-3 .047 Mylar capacitor~ (Solder)
( ) 19. Install C-4 10uf capacitor. Note polarity. (Solder)
( ) 20. Install C-5 56pf or 68pf disc capacitor. (Solder)
( ) 21. Install C-6,7 47uf capacitor. Note polarity. (Solder)
( ) 22. Install C-8 100uf capacitor. 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 computor, check the jumper
table and connect as per your requirements.
( ) 23. Connect J2, J4. (Solder) Note no parity signals are used on ELF II.
JUMPER TABLE
J1 _ - LOGIC, ~UPPER _ & _ _ 1 0~3 __ £ASE, J5 ODD PARITY
@2 LO(lJh ) - .f UPPER CASE ONLY, J6 EVEN PARITY
( ) 24. Solder ribbon cable assembly as per assembly drawing. Note pin #1 must
be positioned as shown. (A socket could be used but will not be as
reliable) •
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1
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POWER SUPPLY TEST
Check all soldering and components for proper value. There are three
alternative methods to power your ASCII keyboard: (1) use 6 . 3 -8V
AC transformer, (2) use your Netronics expansion power supply kit, (3)
use a separate +SV and -12V (regulated) supply.
If you are using an AC supply (lor 2 above):
( ) 1. Connect the 6.3 -8V AC to the P.C. board . If you are using a separate
AC transformer be sure to connect the ground terminal on your keyboard
to the ground on your computor or video display board.
( ) 2. Measure the DC voltage at the +SV and -12V pads on the P.C. board. They
should read within 5% of the specified values. Do not proceed to install
the IC if the voltage is improper. If you are using a separate +SV and
-12V supply measure the voltage before inserting the IC.
( ) 3. Disconnect the power supply.
( ) 4. Install IC-l. Note location of pin #1.
( ) 5. Plug the 14 pin ribbon cable into the video display board. Note the posi-
tion 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
Tn the event of difficulty, check all wiring against the instructions. 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,
Route 202, New Milford, Connecticut 06776, Attention: Service Department.
-3

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