Imsai IKB-1 User manual

IMSAIIKB-1
INTELLIGENT KEYBOARD
Copyright 1977
IMSAI Manufacturing Corporation
14860 Wicks Boulevard
San Leandro. California 94577
Made in the U. S. A.
All rights reserved worldwide.
January. 1978

CAUTION
FAI LURE TO OBSERVE THESE IMPORTANT PRECAUTIONS WI LL VOID WARRANTY
1. Read all material before beginning construction.
2.
Use ON LY electronic quality rosin core solder.
3.
Use extreme care with static-sensitive chips to prevent static discharge damage. (These
chips are inserted in black conductive foam material in your kit.)
4.
Do NOT plug or unplug boards while power is on.
5. Do NOT apply power to any board or circuit before checking each component and
each trace.
6. Do NOT insert chips in socket before all soldering on the board
is completed.
7. Do NOT use nonstandard parts such as fuses of ahigher current rating.
8. Do NOT leave out any construction step.
9.
Use only specified AC power.
10. Prevent
flat cable end from touching areas of the system that may be carrying
current.
11.
Clean unit with soap and water or isopropyl alcohol only to prevent damage to plastic
components.
12.
Some repair operations are quite demanding. Do not attempt repairs beyond your
level of skill to prevent damage to the board or the components.
13.
Use ONL Y a 25 watt electronic soldering iron for assembly of your IMSAI kit.
14. Do NOT perform any solder work on aboard while power is applied.
15. Do NOT plug
or unplug achip from asocket while power is applied.
16. Check power supply voltages BEFORE inserting any boards
into chassis.
17. For all assembled units, read USER GUIDE section for jumpering instructions.
18.
To register your kit for warranty protection, fill out warranty cards and mail to
IMSAI. Kits without warranty cards on file are NOT covered by warranty.

-
IKB-1 KEYBOARD
FUNCTIONAL DESCRIPTION
KEYBOARD FUNCTIONAL DESCRIPTION
The
IMSA IIntelligent Keyboard is aunique, programmable keyboard designed to be used as a
parallel or serial computer input device. Anumber
of keyboard functions may be programmed
by the user through simple keyboard commands, or under direct control of the system CPU.
KEYBOARD: The
IMSAI Intelligent Keyboard utilizes ahigh quality, 63 key mechanical
contact keyboard for high reliability. All keys are fully debounced, and the keyboard provides
full N-KEY
ROLLOVER. Continuous depression of akey will invoke an auto repeat function,
causing a
character to be output continuously until the key is released •. Standard alphanumeric
.and control keys
are arranged in a typewriter type layout.
SERIAL/PARALLEL OPERATION: The keyboard may be configured to operate as aparallel
OR serial input device. The parallel
mode supports afull 8bit parallel format with RDY and
ACK handshaking. The serial
mode supports both EIA and TIL levels. Serial baud rates are
selectable by keyboard commands and allow for the selection of seven separate rates from 110
-2400 baud.
ENCODED/UNENCODED MODES: User
or system CPU programming allows the keyboard to
operate in encoded or unencoded modes. Selection of the encoded mode allows the keyboard to
output standard USASCII code, while the unencoded mode gives the user araw map of the
keyboard array allowing multiple key depressions
to be used for games, music, etc.
KEY PROGRAMMING: Arty individual key may be reprogrammed to output arty given ASCII
character.
UPPER/LOWER CASE: The keyboard may be programmed to operate in upper case only or in
upper and lower case.
CABINET: The cabinet is constructed of high quality aluminum and is finished in an IMSAI
System compatible blue. The cabinet houses the keyboard, an audible beep tone speaker and 3
L
ED indicators. The L ED display indicates entry into the program mode, shift, and upper
case.
EXTERNAL CONNECTIONS: A 2S pin D-type connector provides for the +5V power and
computer
interface connection. Interface lines are compatible with the IMSAI ,1,110 and SIO
interface boards.
An additional 1 Spin D-type connector allows an external keypad to be used.
KEY
-1

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TOLER~NCES UNLESS @ 1977 IMSAI MFG. CORP .• SAN LEANDRO, CA.
OTHERWISE SPECIFIED ALL RIGHTS RESERVED WORLDWIDE
FRACTIONS DEC. ANGLES MADE IN U.S.A.
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J SSE lDRAWING NO
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IKB-l REV.l
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25 PIN CONNECTOR
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(NOT PROVIDED)
J3
15 PIN CONNECTOR
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APPROVALS
DRAWN
lOW' ... NC(S UNlUS @1977 IMSAI MFG. CORP., SAN LEANDRO, CA.
OTH(RWIS( $P(Clfl£O ALL RIGHTS AESERVED WORLDWIDE
~"'CTlONS:: O£C. :NGl[Sf- __ M"",A,O,'~'"N~UOS,A"" -;
IMSAI SYSTEM
IKB - 1 REV. 1
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ASSEMBLY DIAGRAM
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REV. 1.3
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J'
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(NOT PROVIDEDI
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CONNECTOR
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©1977 IMSAI MFG. CORP" SAN LEANDRO, CA.
ALL RIGHTS RESERVED WORLDWIDE
UA"E IN~U~.5~.A",-. __
IMSAI SYSTEM
IKB - 1 REV. 16/77
SCHEMATIC DIAGRAM
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IKB-l ASSEMBLY
BEFORE PROCEEDING
Unpadc all keyboard parts and check each part
against the parts list shown below. Do not
disgard any of the packing materials until all of
the parts are accounted for. In case of any
IKB-l
ASSEMBLY INSTRUCTIONS
discrepancies, conuct your local IMSA I dealer·
or, if you purchased your kit directly from the'
factory, IMSAI Customer Service immed~tely.
IKB-l CIRCUIT BOARD PARTS LIST
IMSAI
ITEM
PART NO.
QUANTITY DESCRIPTION
.,.,..
ELECTRICAL PARTS
"..
Resistor 3&--2820462
82 Ohm, 1/4 W, S% (gry-r-bllc)
3
Resistor 30-3100362 1100 Otvn,
1/4 W, 5% (br-blk-br)
Resistor 30-3150362 1150 Ohm,
1/4 W, 5% (br-gn-br)
Resistor 30-4100362 6
lK Ohm, 1/4 W, 5% (br-blk-r)
Resistor 30-4470362 1 4.71< Ohm, 1/4 W, 5% (y-v-r)
Resistor 30-5100362 2 10K Ohm,1f4 W, 5% (br-bik-o)
Capacitor 32-0220020 220
pF Disk
Capacitor 32-2010010 5.1 uF Disk,
?lJV
Capacitor 32-2202270 1 2.2 uF Tant, 2SV
Capacitor 32-2722070 1
33 uF Tant
Diode 35-1000012 63 lN4148 (ALT: lN914)
Transistor 35-2000003 2N3906
LED
35-?IJOOOOI 3Red
~
Crystal 35-5000006 13.579545
MHz
KEY -3

~
IKB-l
ASSEMBLY INSTRUCTIONS ~
IMSAI
ITEM
PART NO. QUANTITY DESCRIPTION
HARDWARE
Solder
IS-OOOOOOl
5'
Screw 20-3402001 36-32x3/8 Phillips
Pan Head Machine
Nut
21-3120001 3
6-32 Hex
Lockwasher 21-3350001 3
tI6 Internal Star
Washer 21-3390001 3
t/6x1/16" Fiber, Black
INTEGRATED
CIRCUITS (ICfs)
7404 36-0740401 1Hex
Inverter
8035 36-0803501 1Processor -
8212 36-0821201 2 8-8lt Latch
-
74154 36-7415401 2 4 to 16 Decoder
4751
88-0000035 1Programmed "Key 1
Rev. I"
METAL PARTS
Keyboard
6O-OSOOOO3
1Hytek 056300,
wI Custom Caps
Cabinet Ass'y
91~100008(A) 1
IKB-l Cabinet Rev. A
91-1100008(K) (Assembled
or Ki t)
SOCKETS
IC Socket
~
1
24 PIn
IC Socket
23-0800004 140 Pin
IC Socket 23-0800009 114
Pin
TERMINAL STRIPS -CONNECTORS
Connector
~23
15 Pin EI A, Standard
-
Connector 23-0400024 1
2S Pin EI A, Standard
-
KEY -4
,

IKB-l
ASSEMBLY INSTRUCTIONS
IMSAI
ITEM
PART NO.
QUANTITY DESCRIPTION
MISCELLANEOUS
Spacer 21-3600002 37/16"x1/4"
Nylon
Wire
22~122005
3" 22AWG, Red
Tape 28-0600003 1
3M Magic Tape, 1/2" Sq.
Speaker
60-0000OO9 12
1/2" dia. Quam 24AQ728
IKB-l CABINET ASSEMBLY PARTS LIST
"HARDWARE.
-Screw 20-3200001 6jl6-32x1/4" Allen, Button Head, BI. Oxide
Screw 20-3916001 6jl6-32x1
1/2" Allen, Button Head, BI. Oxide
Hardware
Set
21-1100001 2
Nut 21-3120001 66-32 Hex, CAD
Lockwasher
21-33SOOOI
6 tI6 Internal Star
METAL PARTS
Cover 93-21d0008 1
IKB-l
Digibezet 93-2100007 1
9OS-6O Red Polarized Filter
wi Silkscreen Legend
Cabinet Bottom 93-4100002 1
IKB-l ~ev. C
Cabinet Cover 93-4100003 1
IKB-l Rev. H
MISCELLANEOUS
Washer 21-3390001 tl6xl/16" Fiber, Black
"Spacer 21-3600005 6tl6xl
1/16
1
Round Nylon
-Allen Wrench 27-0000001 15/64
KEY
-5

IKB-l
ASSEMBLY INSTRUCTIONS ~
TRACE CUTS
;) 2. Cut the trac:es Ioc:ated in Step 1with a
sharp c:uttlng tool;
e.g., an XACTO
knife.
() 1. Refer to the diagrams below and to the
right and
Joute the three (3) trac:es
designated
to be cut.
-
-
-
---.J
•
•
FIGURE 1: Trace Cuts
•
•
:-.
•
o
L·
KEY -6

IKB-I
ASSEMBLY INSTRUCTIONS
() 4. Install the specified IC's at the follOWing
locations:
You will be instructed when to solder the
remaining pins.
COMPONENT INSTALLATION
IC INSTALLATION
,
•,
•
-..
•
,
•
•
•
•
,
•
•
•
•
••
•
•
••
•
•
•
•
•
••
••
•
III
~
-
••
••
••
·l
••
Insen the IC into the PC board. Ensure
that the IC is oriented correctly.
Be sure that all pins are seated In the
appropriate holes.
Solder
pin 1and the pin at the farthest
corner from pin I. This procedure is
followed in order to hold the IC onto the
board Wltll ttle remaining pins are
soldered.
3)
2)
1)
() S. When you are satisfied that all lC's are
positioned correctly, solder ALL of the
remaining
pins on the solder side o.f the
board.
In the following steps, you will be directed to
"Install" an integrated circuit at a' specified
location. In this context, "Install" means:
() 8212 at U6 (P24)-_
() 8212 at U4 (P24)-_
() 74154 at U2 (P24)-~
() 74154 at UI (P24)--~
The number of pins on apanlcular IC will be
specified
in the assembly instruction step (for
instance, an 18-pin IC Is called out as P18.)
() 3. Identify the top, or component, side of
the keyboard PC board. All integrated
circuits (lC's) will be mounted from this
side
of the board. Refer to the
assembly diagram
on this page In order to
facilitate IC installation.
r
KEY-7
__ ~ ,---~~~ J

() 6. Locate the 24-pin socket and install at
U7. Sockets may be braced against the
component side of the PC board with a __ J
strip of masking tape. Ensure that all
of the pins are seated in the appropriate
holes. Note that the 4751 chip will be
installed
later.
() 7. Locate the 4O-iJin socket and Install at
U5. Note that the 8035 chip will be--"
installed later.
() 8. Locate the 14-pin socket and install at
U3. The 7404 chip will be installed later. ---
() 9. Ensure' that all socket pins are seated in
the appropriate holes. Solder ALL
socket pins on the SOLDER side of the
PC board. Remove the tape holding the
sockets to the front of the board.
KEY
-8
m
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-
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••
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IKB-1
~
ASSEMBLY INSTUCTIONS
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IKB-1
ASSEMBLYINSTRUCTIONS
... R1"
( ) 17. Install a 100 ohm, 1{4 watt resistor I~I II
(brown-Giack-brown) at location R4. -------:-,;;;;;:;.oi!!!1!!~ ...
( ) 18. Solder all leads and cut off excess Le e A4:
lengths. •
•
~
•
•
•
I
••
•
~
•
••
•
••
•
•
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•• A~8 ••• (j5
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••
•
ID
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-
•
() R17
() R16
RESISTOR INSTALL.ATION
() RIS
() R18
() R7 -'
() RS
()10. Install a 1K ohm, 1{4 watt resistor
(brown4llack-red) at locations:
( ) 16. Install an 82 ohm, 1/4 watt resistor
(grey-red-Glack) at I_tions: 'R3
() R3 ------:1~'*'~,;;5;l!1 I I
() R2_ • A2·
() R1 I~I II
In the following steps you will be instructed to
"Install" apanicular component.
In this
context, to install means to "insen the pan into
the circuit board and bend back the leads".
You
will be instruc ted when to solder the components.
( ) 11. Install a 10K ohm, 1{4 watt resistor
(browrHllack-orange) at I_tions:
( ) 15. Install a 1K ohm, 1{4 watt resistor
(brown-Giack-red) at locations:
( ) 12. Install a lK ohm, 1{4 watt resistor
(brown-bladc-red) at I_tions:
() R14
() R13
()13. Install a4.7K ohm, 1{4 watt resistor
(yellow-yiolet-red)
at R9. =.:.:.~::.::.:.;.------
( ) 14. Install a 150 ohm, 1{4 watt resist •• o:r_-----
(brown-green4lrown) at loation R8 ••
-
-
KEY-9

••
•
•
•••
•,
•
•,
•
••
•
••
•
.-
•
......
•
•
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•
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•
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•
•
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•
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•
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•
..
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•
..
•
••••
•
••
-
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....
-
••
( ) 23. Install a 33 uF tantalum capacitor at
location C1. -4~~~
( ) 22. Locate three (3) 0.1 uF disk ceramic
capaciton and install them at locations:
( ) 24. Solder all leads and clip off excess lead
lengths. SAVE THE CAPACITOR
LEADS;
YOU WILL NEED TO USE
THEM AS JUMPER WIRES LATER
ON.
() C9
() C8
() C5---'
() C4 __ ~
() C3--'
() C7
() C6
( ) 21. Install a 2.2 uF tantalum capacitor at
location C2. -1- __ 1)
( ) 20. Locate two (2) 20 pF disk ceramic
capaciton and install them
at locations:
( ) 19.. Locate two (2) 0.1 uF disk ceramic
capaciton and install them at locations:
The
untalum capaciton installed in Steps 21 and
23 are POLAR IZED and must be inserted in the
correct orientation. The positive lead of the
capacitor is marked as such ( .... )and should be
it.stalled in the SQUARE pads on the PC board.
CAPACITOR INSTALLATION
KEY
-10

-
-
JUMPER INSTALLATION
Steps
25 - 28 apply ONLY for parallel
interfacing
(e.g., for the PCS-80(30). If you
will be using aserial interface, refer to the
jumper instructions
in the User Guide of this
.
manual, Section 3.1.2.
The excess lead lengths which you trimmed off
the capacitors and resistors serve as jumper
wires
in the steps which follow. Cut the leads
to appropriate lengths, and insert them
at the
specified locations from the
COMPONENT side
of the PC board.
( ) 25. Insert and solder ajumper
at location JR
(to the right
of US). The jumper should
connect the center hole to the +SV hole.
Clip excess.leads.
,.... () 26. Insert and solder thirteen (13) jumpers
at the locations indicated:
( )
JB
I )
JK
II
JC
I )
JL
JE
I )
JM
( )
JF
( ) IN
I )
JG
I ) JO
()
JH
I ) JP
I )
JI
Clip excess leads.
I ) TI. Insert and solder ajumper to the right
of Q1, at the location indicated in the
diagram
to the right. Clip excess leads.
( ) 28. Insert and solder ajumper
at location JA
Iabove and to the left of the tantalum
capacitor Cl). The jumper originates at
the plated-through hole in the middle and
connects to the hole labeled P. Clip
excess leads.
TRANSISTOR INSTALLATION
See Section II, Figure 2-3
for instructions
concerning correct transiStor orientation.
.-

LED INSTALLATION
Three (3) .LEDs
will be installed at the locations
bearing the call-outs .PROG". ·SH 1FT" and
·ue". Refer to Figure 2 to ensure correct
L ED orientation.
(l 30. At each of the locations indicated, orient
the LED
as shown in the figure, slip a
tl6x7/16 white, nylon spacer over the
LED leads and insert the leads into the
PC board. The lead in front (direc t1y
below the flat face of the LED body)
should be inserted into the SQUARE pad
on the PC board.
( ) 31. Solder the leads on the SOLDER side of
the board while holding the LED
assembly in place from the component
side of the PC board.
FIGURE 2: LED Installation
CRYSTAL INSTALLATION
( ) 32. Locate the 3M "Magic Tape
ll
enclosed
with your kit;
cut out asquare of tape
whose size matches the box designated
as ·Y1· on the silk screen.
KEY - 12
IKB-l
ASSEMBLY INSTRUCTIONS
( ) 33. Refer to Figure 3and trim the crystal
leads to 1/2 inch. Bend the leads 1/8"
from the body of the crystal.
( ) 34. Install the crystal at location Y1 -as
shown in the figure - and solder the
leads on the SOLDER side of the board.
Crystal
tr'
u
FIGURE 3: Crystal Installation
-
-
--

-
IKB-l
ASSEMB LY INSTRUCTIONS
CONNECTOR INSTALLATION
•
•
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25 • Pin Connecter
", .. ~: .... _' .... _ ... g .. ld ~ ~
........... _ @ ••• _ ••••••• @O U~~
J3
( ) 36. Refer to Figure 4and install the 2S-pin
connector at location )2 F ROM THE
SOLDER SIDE OF THE BOARD.
( ) 35. Locate the 2S-pin and 15-pin EI A
connectan; check to see that none of
the connector pins are bent.
( ) 37. Install the lS;lin connector at location
)3.
FIGURE 4: Connector Installation
15 •Pin Connecter
( ) 3S. Check to see that all pins are seated in
the appropriate eyelets, and secure each
connector with twa (2) phillips
6-32x3{S" screws F ROM THE
COMPONENT SIDE OF THE BOARD.
(See Figure 4.)
_ () 39. Solder all pins (40) an the COMPONENT
side of the board.
•
KEY -13
------

DIODE INSTALLATION
( ) 40. Locate a1N4148
Diode and install it in
the extreme upper left-hand corner of
the board at loc:ation CR1. Insert the
diode from the COMPONENT side of the
board.
Trim excess leads.
( ) 41. Identify the solder, or bottom.. side of
the keyboard PC board. All remaining
diodes will be mounted from the
SOLDER side of the board. Refer to
the
Diode Placement Diagram in order to
facilitate
diode installation.
( ) 42. Insert sixty-two (62) 1N4148 diodes
from the SOLDER side
of the board, at
IKB-l
ASSEMBLY INSTRCTIONS
the locations indicated
in the Diode
Placement Drawing. The diodes should be
mounted flush against the PC board.
SOLDER
AND TRIM THE DIODE
LEADS FLUSH AGAINST THE
PC
BOARD. MAKE YOUR SOLDER
JOINTS
AS SMOOTH AS POSSIBLE.
IMPORTANT:
All diodes are polarized
and installed in aspecific orientation.
The "cathode" end is marked with a
colored band and is represented
on the
Diode Placement Diagram in the manner
illustrated below. Note
that in this
instance,
all the diodes are orientated in
the same direction.
-
--
•
•
•
~
~
•
·
·
•
••
•
1J
•
[-
[-0
•
.: ~~
cr-.
~
•
.~
to G'-
•
a..
•
• •
KEY -14
It.;
•
••

-
KEYBOARD INSTALLATION
( ) 43. Install the keyboard to the
COMPONENT. side
of the PC board;
ENSURE THAT ALL KEYBOARD
PINS (124) PROTRUDE TO THE
SOLDER SIDE OF THE BOARD.
Align
the keyboard so that the three (3) blac;k
plastic feet on the rear of the keyboard
project through the metal-rimmed
alignment holes
on the ~older side of the
keyboard (see Figure
5). Solder the
keyboard
pins (124). "
IKB-1
ASSEMBLY INSTRUCTIONS
Keyboard Alignment
Hole
o
--
-
SPEAKER INSTALLATION
( ) 44. Solder a 1 1/2-inch length
of orange wire
onto each
of the two crimp terminals on
the speaker.
( ) 45. Position the speaker on the SOLDER
side
of the PC board as indicated in
Figure 6. To install the speaker onto
the board, insert a6-32x3/S" screw
in
each of the three holes indicated in the
figure. Each screw is inserted from the
top (COMPONENT SIDE)
of the board,
through two fiber washers, through the
speaker. and is secured with an internal
star Ioc:J<washer and 6-32 nut. Tighten
the speaker mounting
screws.
( ) 46. Solder the free end of each wire insulled
in Step 44 onto the eyelets indicated in
Figure 6.
: :
FIGURE 5: Keyboard Installation On PC Board
FIGU
RE 6: Speaker Installation
KEY - 15