XETEC Lt. Kernal Operating Manual
READ ME FIRST
1-22-88
THANK YOU for purchasing the Lt. Kernal. Please read the following before proceeding.
1.
Make sure that all functions of your computer system are working
properly before adding the Lt. Kernal Disk drive to your system
because any problems that your system might have, could be seen
as Lt. Kernal problems after it is installed.
2.
READ the Lt. Kernal manual thoroughly before doing any installa-
tion.
Do not assume anything. See Section II, pages 2-1 through 2-20.
3.
Do not attempt any of the installation work with the power on. Do
not connect anything to your computer with the power on.
4.
When doing the internal hook-up on your computer, DOUBLE
CHECK the connections before closing the computer.
5. If all of
with the steps in the manual to bring your Lt. Kernal to life. See Sections m and on.
6. Most problems encountered on an initial system boot are due to having a C-128 computer system set for an 80 column display. This will
result in a Commodore sign-on message with no apparent activity from
the Lt. Kernal. This is due to the fact that the Lt. Kernal is shipped
to boot-up in the 64 mode (40 column display). Simply make sure
that both the monitor and computer are set to 40 column operation
OR change the boot-up default to C-128 mode with the CONFIG
command.
7. If you have carefully followed the instructions, your Lt. Kernal should
be running and ready for your use. If it is not functioning, re-check
the installation
8. After you have the system running, become familiar with it before
making changes. Learn how to use the simple commands before attempting a system CONFIGuration, for example.
9. DO NOT DO a SYSGEN unless absolutely necessary. Read the
REPLACEMENT pages 2-25 and 2-26 tided THE SYSGEN UTILITY to determine when and how to do a SYSGEN.
the
above has been done properly, you are ready to continue
and
refer
to
the Trouble Shooting section of the manual.
10.
When making changes, record the condition the system was in prior
to making the changes.
11.
Most Users get into trouble
are doing, and then question the need to do it.
12.
If you have any doubts, call us or check into the BBS for help. The
BBS is listed on page A-7 of your manual.
13.
If possible, save the box and packing material your unit was shipped
in.
This box was designed to safely ship the Lt. Kernal.
assuming.
Make sure you know
what
you
Lt. Kernal
20 or 40 Megabyte Systems
Operating
Manual
Lt. Kernal is a registered trademark of Fiscal Information, Inc.
LIMITED WARRANTY
Xetec, Inc. warrants this Xetec hard disk drive known as the Lt.
Kernal, to be in good working order for a period of one year from the
date of purchase from Xetec, Inc. or an authorized Xetec dealer.
Should this product fail to be in good working order at any time during this one year warranty period, Xetec will at its option, repair or
replace this product at no additional charge except as set forth below.
Repair parts and replacement products will be furnished on an exchange basis and will be either reconditioned or new. All replaced
parts and products become the property of Xetec, Inc. This limited
warranty does not include service to repair damage to the product
resulting from accident, disaster, misuse, abuse, or non-Xetec
modification of the product.
Limited warranty service may be obtained by delivering the product
during the one year warranty period to an authorized Xetec dealer or
to Xetec, Inc., and by providing proof of purchase date. Warranty will
be valid for registered owners only. If this product is delivered by
mail, you agree to insure the product or assume the risk of loss or
damage in transit, to prepay shipping charges to Xetec, Inc., and to
use the original shipping container or equivalant. Contact Xetec,
Inc.,
2804 Arnold Rd., Salina, Ks.
information.
67401,
(913)827-0685 for further
All express and implied warranties for this product including the warranties of merchantability and fitness for a particular purpose, are
limited in duration to a period of one year from the date of purchase,
and no warranties, whether expressed or implied, will apply after this
period. Some states do not allow limitations on how long an implied
warranty lasts, so the above limitations may not apply to you.
If this product is not in good working order as warranted above, your
sole remedy shall be repair or replacement as provided above. In no
event will Xetec be liable to you for any damages including any lost
profits, lost savings or other incidental or consequential damages arising out of the use of, or inability to use such product, even if Xetec or
an authorized Xetec dealer has been advised of the possibility of such
damages, or for any claim by any other party.
Some states do not allow the exclusion or limitation of incidental or
consequential damages for consumer products, so the above limitations
or exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have
other rights which may vary from state to state.
TABLE
The Lt. Kernal preface v
OF
INTRODUCTION
CONTENTS
FCC Statement
The Lt. Kernal 1-1
DOS features
Technical specifications
Installation 2-1
Power voltage
Physical handling precautions
Equipment installation
C-64 installation
C-128 installation
128D installation
Burst Mode Modification
I/O Modification
Power Application
vi
SECTION I
1-1
1-2
SECTION II
and
frequency
2-1
for CP/M 2-18
and
Removal
2-1
2-1
2-3
2-7
2-12
2-14
2-20
SECTION III
Activating the System 3-1
What
to
expect
Operating Concepts 4-1
How
the Lt.
Operating limitations
Commands Overview 5-1
Run-mode commands
Direct-mode commands
Review
Syntax Definitions and Conventions 6-1
of
3-1
SECTION IV
Kernal works
4-1
DOS features
4-1
SECTION V
5-1
5-1
5-2
SECTION VI
I
SECTION VII
Run-mode Features and Commands ..
command page
autoaccess feature
autostart feature 7-2
bell feature
BUILDKEY file
COPY
DELETE key
INSERT key 7-6
LDLU
LG
LOAD
OPEN
SAVE
SCRATCH 7-12
SEARCH for key 7-13
SHUFFLE key file directory
SECTION VIII
Direct-Mode Features and Commands.
7-1
7-1
7-3
7-4
8-13
7-5
7-7
7-8
7-9
7-10
7-11
7-14
8-1
command page
Tt
(restore defaults)
8-1
ACTIVATE 8-2
AUTOCOPY
8-3
AUTODEL 8-4
AUTOMOVE
BUILD
BUILDCPM
BUILDINDEX
CHANGE
8-5
8-6
8-7
8-8
8-9
CHECKSUM 8-10
CLEAR
CONFIG
COPY
D (change drive if)
8-11
8-12
8-13
8-14
DELete BASIC lines 8-15
DI (dump key file directory) 8-16
File type definitions 8-16
DIRectory 8-17
DUMP BASIC to text 8-19
ERAse file
8-20
FASTCOPY backup utility 8-21
FETCH text to BASIC 8-22
FIND
8-23
ii
Direct-Mode Features and Commands
G064 8-25
GO 128
GOCPM 8-27
ICQUB capture utility 8-28
Invoke feature 8-30
L (abbrieviated LOAD)
LOAD 8-31
LKOFF
LKREV 8-33
LU (change logical unit
MERGE 8-35
OOPS (recover erased file)
QUERY 8-37
RECOVER 8-38
RENUMber BASIC programs 8-39
S (special save) 8-45
SAVE program
SHIP (prepare drive
TYPE disk BASIC
UPDATEDOS
USER (change subdirectory) 8-50
VALIDATE 8-51
to
#)
disk 8-46
to
ship) 8-47
to
screen 8-48
continued
8-26
8-31
8-32
8-34
8-36
8-49
SECTION
Programming Considerations
General precautions 9-1
Backup copying 9-2
Directly invoked applications 9-4
Stack manipulations 9-5
Reserved memory areas 9-5
Speed tips 9-6
Disk partitioning 9-6
KEY FILES
KEY file usage
Definitions
KEY file structure 9-7
Simple
KEY file constraints 9-11
DIRECTORY lengths
KEY Run-mode values 9-13
KEY command mode values
KEY command parameters 9-14
KEY command general status returns 9-15
BUILDKEY file command 9-15
Machine Language
of KEY
KEY
file terminology 9-7
file examples
vs KEY
key
file access 9-16
IX
9-1
9-7
9-8
lengths
9-12
9-14
iii
Programming considerations
INSERT
DELETE
SHUFFLE directory command
SEARCH commands
The CONFIG processor
The SYSGEN utility
key
key
command
command
9-17
9-19
9-21
9-25
continued
9-18
9-18
SECTION
Addenda/Errata
and
Update Documentation
SECTION
Trouble-Shooting
Trouble-shooting guide
Functional tests
Equipment return policy
and
Warranty Service
11-1
11-2
11-5
SECTION
DOS System Enhancements
Obtaining updates
'BUG' reporting
'BUG' reporting form
12-1
12-1
12-1
12-2
SECTION XIII
Installing CP/MTM 0n the Lt.
Using
Building
Operating Speed
CP/M 13-1
CP/M 13-1
13-3
X
XI
XII
Kernal
10-1
11-1
^
13-1
Lt. Kernal Networking
DIAG command
KEY File Programming Example
Bulletin Board
20/40
Index
Meg
X-l
A-7
Add-on Drives
SECTION
XIV
14-1
SECTION
XV
15-1
APPENDIX
I
A-l
APPENDIX
APPENDIX
II
III
A-8
iv
The Lt. Kernal
Welcome to the world of Serious Computing!
PLEASE READ THIS MANUAL CAREFULLY
BEFORE ATTEMPTING TO INSTALL YOUR LT. KERNAL!
If the first few pages of section II of this manual seem a little stern,
please understand — we want you to have the BEST possible service
from your Lt. Kernal. The only way to let you know about the potential for damage you could do to your system is to tell it like it is!
You've invested in the most advanced disk system available for
Commodore™ computers, and an incorrect installation may damage
the Lt. Kernal, your computer, or both. Read the installation portion of this manual carefully before connecting together any parts of
the system.
The Lt. Kernal results from eighteen years of experience in designing
large multi-user, multi-tasking mini-computer systems. We have applied the technology used in those larger systems to improve the
operating characteristics and speed of the C-64® and C-128® .
Thank you for purchasing the Lt. Kernal. You now have at your
fingertips really high speed computing power and a comfortable, userfriendly disk operating system that significantly upgrades the functions
and usability of your Commodore computer. Quality software written
with the user in mind, and rugged, conservatively designed hardware
are combined to produce the best accessory ever for Commodore
computers.
Lt. Kernal is a registered trademark of Fiscal Information, Inc.
C-64 and C-128 are reg. TM of Commodore Business Machines, Inc.
v
FCC STATEMENT
This equipment generates and uses radio frequency energy and if not
installed and used properly, that is, in strict accordance with the
manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the
limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference in a residential
installation. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to cor-
rect the interference by one or more of the following measures:
• Reorient the receiving antenna
• Relocate the computer with respect to the receiver
• Move the computer away from the receiver
• Plug the computer into a different outlet so that computer and
receiver are on different branch circuits.
If necessary, the user should consult the dealer or an experienced
radio/television technician for additional suggestions. The user may
find the following booklet prepared by the Federal Communications
Commission helpful: "How to Identify and Resolve Radio-TV Interference Problems." This booklet is available from the U.S. Government Printing Office, Washington, D.C., 20402, Stock No.
004-000-00345-4.
MANUFACTURER'S WARNING: Using a cable between the "Host
Adaptor" and the "Hard Drive Assembly", other than that provided
by Xetec Inc. may result in interference to radio and television
reception.
vi
I
The Lt. Kernal Disk Operating System V7.1
DOS FEATURES
Runs certain copy-protected software
Built-in KEYED INDEXED-RANDOM ACCESS METHOD
Supports both C-64 and 128 modes of operation and CP/M®
58 additional or enhanced system commands and features
Disk access speed more than 100 times faster than the 1541 floppy
Automatic power-up execution of any application program
Built in CP/M™ - like command-line features in C-64 and 128 modes
User configurable system characteristics such as screen and character
colors, and logical drive sizes
Up to eleven logical drives may be defined on the hard disk
Up to 7 hard drives in one system
DOS allows up to seven files to be OPEN for reading and writing
simultaneously in addition to the command/error channel
DOS differentiates between BASIC and machine language programs
Built-in backup and restore facilities
Direct invocation of programs from the READY prompt
Standard capacity of 20 Megabytes configurable up to 140 Meg.
Optional Multiplexer allows up to 16 computers to share 1 Lt.
Kernal system
1-1
TECHNICAL SPECIFICATIONS
Standard capacities, Formatted
Bytes per sector
20 Megabytes
512
Sectors per track 17
Tracks per cylinder
4
Number of cylinders 626
Media size
Recording density
5'/4" (13.3 cm)
10,200 Bits/inch
Track density 300 tracks/inch
Transfer rate to C-64 memory
38,000 Bytes/sec
Transfer rate to C-128 memory 65,000 Bytes/sec
Rotational speed
3,600
RPM
Average latency time 8.3 ms
Positioning time
18 ms min.
192 ms max.
Power consumption
20 Meg. SCSI Drive unit
117 Volts A.C. 60 Hertz 30 w typical
Host Adaptor
+ 5 Volts D.C. 250 ma typical
Size
20 Meg. SCSI Drive unit
Weight
20 Meg.SCSI Drive unit 10.80 lbs.
40 w max.
12"
x 14" x 2.5
1-2
II.
INSTALLATION
CAUTION!
Unless your Lt. Kernal hard disk system is specifically labeled
otherwise, your system has been factory wired for:
115 volts A.C. 60 hertz only
Do not plug the power cord into any other voltage or frequency
outlet.
For domestic American systems, the correct outlet type is the
three prong grounded variety. Use of a three prong adapter in a
two prong ungrounded outlet is strongly discouraged since such
use presents a high shock hazard and may damage your system.
CAUTION!
Always handle your hard disk/power supply assembly with the utmost
care.
Mechanical bumps and shocks to the drive could irrepairably
damage it.
Never move or ship the drive without first conditioning it for shipping
via the "ship" system command, described later in this manual.
Never move the drive unless power has been off for at least 30
seconds.
Never ship the drive in any container except its original carton.
INSTALLING THE LT. KERNAL
Installation of the Lt. Kernal hardware takes only a few moments, but
MUST be done carefully to avoid damage. For a typical system setup
refer to FIG 1. Be gentle, and work slowly and deliberately, referring
to the text frequently as you go.
2-1
Typical System
FIRST
Make sure power is completely turned off to all components of your
computer and the Lt. Kernal!!
SECOND
NEVER, NEVER, plug or unplug any interconnection of the system
with power applied!!
THIRD
Always remember the second rule or you will eventually destroy some
component of your system.
FIG. 1
2-2
BEFORE BEGINNING YOUR INSTALLATION OF THE
LT.
KERNAL, CAREFULLY CHECK YOUR COMPUTER FOR
PROPER OPERATION WITHOUT THE LT. KERNAL
INSTALLED. THIS WILL PREVENT FALSE
INDICATIONS OF TROUBLE LATER.
There are two possible installations of the Lt. Kernal. One is for the
C-64 computer, and the other for the C-128. To utilize the 128 mode
in the C-128, the C-128 adaptor board must be installed. Both installations will void your computer's warranty, as you will be required to
open the computer case install clips and/or an adaptor board. If you
do not feel competent to do this installation properly, seek the
assistance of a qualified computer technician. CAUTION: Read each
step thoroughly first before proceeding.
TOOLS REQUIRED: A #1 phillips screwdriver and possibly a T-10
TORX driver plus needle nose pliers for the 64C inner shield and a
small flat blade screwdriver.
C-64 or C-64C INSTALLATION
Step 1 - Remove screws on the bottom of the computer case, un-snap
the upper keyboard section and carefully unplug the keyboard and indicator LED cables. Place this section aside for now.
Step 2 - Locate the HIRAM and CAEC cable assemblies. Refer to
FIGS 2 and 3 to find your model and attach the HIRAM clip to the
lead indicated of resistor R44 and attach the CAEC clip to PIN 6 of
chip U27. Be sure that the clip is not shorting to any of the adjacent
pins of either chip. Secure both leads with small pieces of scotch tape
and dress each end out the opening for the expansion slot on rear of
computer. NOTE: On some models, the metal shield must first be
lifted by removing the TORX screws as needed, and then un-twist the
small metal tabs around the perimeter of the shield. Replace this shield
after the above clips are installed.
Step 3 - Install the keyboard section by first connecting the keyboard
and LED cables and their lower section into place, snap case shut and
install bottom screws into case.
Step 4 - Locate the HOST ADAPTOR and push the HIRAM connector onto the leftmost pair of pins of plug PI as shown in FIGS 2 and
3.
Push the CAEC connector onto the 4th set of pins from the left on
plug PI again as shown in FIGS 2 and 3. The jumpers on the 3rd and
5th sets of pins must also be in position as shown. The Host adaptor
may now be inserted into the EXPANSION connector on the rear of
the computer.
2-3
C-64 cable connections version 2
You may have a newer version of the C64 computer board that is smaller
at about 5" wide. Use the information below to make your HIRAM and
CAEC connections.
HIRAM cable to pin 28 of U6 (MPU) or to pin 6 of U8 (PLA)
CAEC cable to pin 5 of U6 (MPU) or to pin6 of U3.
2-5
Step 5 - Locate the 25 pin SIGNAL cable, plug one end into the connector on the rear of the Host Adaptor and secure the cable with the
attached screws. Refer to FIG 4.
Step 6 - Attach remaining end of the 25 PIN SIGNAL cable to the
HOST ADAPTOR INPUT connector of the HARD DISK enclosure.
Again, secure the cable with the attached screws. Refer to FIG 5.
Step 7 - Locate the AC POWER CABLE and plug female end into the
AC POWER receptable of the HARD DISK enclosure. Make sure the
Power Switch is in the OFF position and plug the male end into a properly grounded 115 volt AC, 60 Hz outlet. Refer to FIG 5.
Step 8 - Re-connect any other components to your system such as
printers, floppy disk and other accessories.
Step 9 - Refer to Power Application Sequence page 2-20.
2-6
Rear view of Lt. Kernal hard disk enclosure
C-128 INSTALLATION
Step 1 - Remove screws on the bottom of the computer case, un-snap
the upper keyboard section and carefully unplug the keyboard and indicator LED cables. Place this section aside for now.
Step 2 - Lift the metal shield by removing the TORX screws and untwisting the metal tabs around the perimeter of the circuit board
shield. Lay this shield aside for now.
Step 3 - Locate the C-128 ADAPTOR and lay on top of the SHIELD
as shown in FIG 7. CAUTION: Discharge yourself from potential
static electricity by touching the metal SHIELD before proceeding to
the next step.
Step 4 - Locate chip U7 in FIG 6. Gently remove this chip from its
socket by inserting a small flat blade screwdriver as shown and then
carefully rotate or twist the blade left and right. DO NOT USE A
PRYING ACTION! Once removed, check all pins for straightness, and
proceed to next step.
Step 5 - Carefully insert chip U7 into the socket provided on the
C-128 ADAPTOR. CAUTION: Be sure PIN 1 of chip matches PIN 1
of socket or indented end of chip matches indented end of socket.
Refer to FIG 7.
2-7
Removal of chip U7 in C-128
On
INSIDE VIEW EiF C-128
FIG. 6
2-8
C-128 adaptor board installation
TO
INSIDE VIEW OF C-128
FIG. 7
2-9
C-128 cable connections with Rev C adaptor board
\
\
\
PIN
1
\
4
\
10
INSIDE VIEW DF C-128
FIG 7A
The Rev B and Rev C adaptor boards are functionally identical. They vary
only in size. Your Lt. Kernal 128 system may contain either Rev board.
2-9A
Step 6 - Install the C-128 ADAPTOR into the socket vacated in Step 4
as shown in FIG 8. CAUTION: Make sure pins on the bottom of
adaptor board are in their proper positions before firmly seating into
place. Press down firmly in the area shown to firmly seat the ADAPTOR board in place.
C-128 cable connections
FIG. 8
2-10
C-128 adaptor board (Rev C) installation
2-10A
Step 7 - Refer to FIG 8 and locate HIRAM CABLE. Clip this cable
to PIN 23 of U11 as shown and secure with a piece of scotch tape. Be
sure that the clip is not shorting to any of the adjacent pins of Chip
Ull.
Plug the remaining end onto plug P2 of the C-128 ADAPTOR
board as shown. (NOTE: The CAEC CABLE is not used in the C-128
installation)
Step 8 - Again refer to FIG 8 and locate the C-128 cable and take
either one of the ends and position it so the flat ribbon is coming out
of the top side of the connector. Now push this connector onto plug
PI of the C-128 ADAPTOR board as shown making sure all ten pins
are properly entering each hole on the socket.
Step 9 - Locate the HOST ADAPTOR and remove the two jumpers
on plug PI as they will not be used in your C-128 installation. Push
the remaining end of the C-128 CABLE onto plug PI again with the
flat ribbon coming out on the top side of the connector. The HOST
ADAPTOR may now be inserted into the EXPANSION connector on
the rear of your C-128. Dress or position the flat cable so it will allow
you enough slack to remove your HOST ADAPTOR if necessary.
Refer to FIG 9.
HOST
Host Adaptor cable connections for C-128
ADAPTOR
•
rREMDVE
HOST
ADAPTOR
•
FIG. 9
2-11
Step 10 - Replace the metal shield on the C-128 main board being
careful not to pinch or bind the C-128 CABLE.
Step 11 - Install the keyboard sections by re-connecting the cables,
snap case halves together, and install bottom screws in case.
Step 12 - Locate the 25 pin SIGNAL cable, plug one end into the
connector on the rear of the Host Adaptor and secure the cable with
the attached screws. Refer to FIG 4.
Step 13 - Attach remaining end of the 25 PIN SIGNAL cable to the
HOST ADAPTOR INPUT connector of the HARD DISK enclosure.
Again, secure the cable with the attached screws. Refer to FIG 5.
Step 14 - Locate the AC POWER CABLE and plug female end into
the AC POWER receptable of the HARD DISK enclosure. Make sure
the Power Switch is in the OFF position and plug the male end into a
properly grounded 115 volt AC, 60 Hz outlet. Refer to FIG 5.
Step 15 - Re-connect any other components to your system such as
printers, floppy disk and other accessories.
Step 16 - Refer to Power Application Sequence page 2-20.
128D INSTALLATION
Step 1 - Unplug power, keyboard, and all other connections from the 128D
computer.
Step 2 - Remove the 2 screws on the bottom and the 3 screws on the back
of the computer case. Slide top back and lift up to remove. Place this aside
for now.
Step 3 - Locate the 128D Adaptor Board and place it on a firm, flat sur-
face.
CAUTION: Discharge yourself from potential static electricity by
touching the metal case of
the
computer before proceeding to the next step.
Step 4 - Locate U7 on the mother computer board. Refer to FIG 10. Gently remove this chip from its socket by inserting a small flat blade screwdriver
as shown and then carefully rotate or twist the blade left and right. DO
NOT USE A PRYING ACTION! Once removed, check all pins for
straightness, and proceed to the next step.
Step 5 - Carefully insert chip U7 into the socket provided on the 128D
Adaptor Board. CAUTION: Be sure pin 1 of chip matches pin 1 of socket
or indented end of chip matches indented end of socket. Refer to FIG 11.
Step 6 - Install the 128D Adaptor Board into the socket vacated in Step
4 as shown in FIG 12. CAUTION: Make sure pins on bottom of adaptor
board are in their proper positions before firmly seating into place.
2-12
INSIDE VIEW OV 128D
128D cable connections
FIG 12
Step 7 - Refer to FIG 12 again and locate HIRAM Cable. Clip this cable
to Pin 23 of
U11
as shown. Be sure that the clip is not shorting to any adja-
cent pins of chip Ull. Plug the remaining end onto plug P2 of the 128D
Adaptor Board as shown. (Note: The CAEC Cable is not used in the 128D
installation)
Step 8 - Again refer to FIG 12 and locate the 128 cable. Take either one
of the ends and position it so the flat ribbon is coming out of the top side
of the connector. Now push this connector onto the plug PI of the 128D
Adaptor Board as shown making sure all ten pins are properly entering each
hole on the connector.
Step 9 - Repeat the applicable steps 9 through 16 of the C-128 Installation
starting at page 2-11.
Burst Mode Modification
The Lt. Kernal does not support the "FAST" modes of the 1571
drive. If using a 1571 with a 128 computer, you must use the serial
cable included with the Lt. Kernal, or else directory listings, programs, etc. will not load without being scrambled. With this cable,
your 1571 will operate at the speed of a 1541.
2-14
The following steps instruct how to modify your 128 computer to take
advantage of the burst mode. The Burst Mode Modification MUST
BE DONE if you are using a C-128D computer to work correctly
with the Lt. Kernal. If you do not have a need for the burst mode, we
suggest that you do not perform this modification. It will VIOLATE
your Commodore warranty. If you do not have any technical skills and
yet would like to make this modification, we suggest you have a
qualified technician perform it.
Step 1 - Remove screws on the bottom of the computer case, unsnap the
upper keyboard section and carefully unplug the keyboard and indicator
LED cables. Place this section aside for now.
Step 2 - Lift the metal shield by removing the TORX screws and untwisting
the metal tabs around the perimeter of the circuit board shield. Lay this
shield aside for now.
Sfep 3 - Locate chip U8 on the circuit board. Refer to FIG 13 for the C-128
computer and FIG 14 for the 128D computer. For the C-128, cut pin 9
of U8 and for the 128D, cut pin 13 of
U8
as close as possible to the circuit
board and CAREFULLY bend the pin upward so that it is parallel to the
circuit board. Refer to FIG 15.
Illlllllll
INSIDE VIEW
ElF C-128
HIRAM
ID PIN 2
• F Ull
FIG 13
mi
I
"
4JJJJ
TTTTT
n
u
D
- C-128
117
?
a
CABLE
n|
-PRESS
IN
THIS
DO
A
2-15
FIG 14
Step 4 - Solder one end of an insulated wire to the pin of U8 modified in
step 3. Refer to FIG 16. Be careful NOT to solder bridge adjacent pins
of U8.
Step 5 - Locate and unplug the Adaptor Board from the computer circuit
board. Carefully remove U7 from the adaptor board. Solder the other end
of the wire to the bottom of the Adaptor Board at pin 47 of the U7 socket
being careful NOT to solder bridge pin 47 to pin 46 or
48.
Refer to FIG 17.
Step 6 - Re-install U7 into the socket. CAUTION: Be sure pin 1 of chip
matches pin 1 of socket. Re-Install the Adaptor Board into the computer
circuit board making sure pins on the bottom of the adaptor board are in
their proper positions before firmly seating into place. Refer to C-128 and
128D INSTALLATION—pages 2-7 through 2-14.
Step 7 - Re-assemble the computer as previously outlined refering to pages
2-7 through 2-14.
2-16
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