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DIAGNOSTIC MANUAL
PC10
MAY 1988
PN-314984-04
Commodore Business Machines, Inc.
1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.
Commodore makes no express or implied warran
ties with regard to the information contained here
in. The information is made available solely on an as
is basis, and the entire risk as to completeness, reli
ability, and accuracy is with the user. Commodore
shall not be liable for any damages in connection
with the use of the information contained herein.
The listing of any available replacement part herein
does not constitute in any case a recommendation,
warranty or guaranty as to quality or suitability of
such replacement part. Reproduction or use with
out express permission, of editorial or pictorial con
tent, in any matter is prohibited.
This manual contains copyrighted and proprietary information. No part
of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical,
photocopying, recording or otherwise, without the prior written permis
sion of Commodore Electronics Limited.
Copyright © 1988 by Commodore Electronics Limited.
All rights reserved.
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PC10 DIAGNOSTICS
COPYRIGHT (C) 1987-88 Commodore Business Machines Inc.
(COMMODORE) and Windsor Technologies Inc. (WINDSOR). All rights
are reserved worldwide. The PC10 Diagnostics Manual is the
Property of COMMODORE and WINDSOR, the Computer Program is the
property of WINDSOR, and both are protected by the trade secret
and copyright laws. The PC10 Diagnostics is a trademark of
COMMODORE.
The PC10 Diagnostics computer program or Diagnostics Manual may
not be copied, reproduced, disclosed, transferred or reduced to
electronic medium or machine-readable form, without the express
written approval of COMMODORE and WINDSOR. Unauthorized copying
of the program or Diagnostics Manual is a violation of copyright
and trade secret law.
COMMODORE AND WINDSOR MAKE NO WARRANTIES EXPRESSED OR IMPLIED,
RELATING TO THE PC10 DIAGNOSTICS COMPUTER PROGRAM, DIAGNOSTICS
MANUAL, TEST DISKETTES, OR TEST PLUGS INCLUDED BUT NOT LIMITED TO
IMPLIED WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, AND ALL SUCH WARRANTIES ARE EXPRESSLY AND SPECIFICALLY
DISCLAIMED. IN NO EVENT SHALL COMMODORE OR WINDSOR BE RESPONSIBLE
FOR ANY INDIRECT OR CONSEQUENTIAL DAMAGES OR LOST PROFITS, EVEN
IF COMMODORE AND/OR WINDSOR HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
Unless otherwise specifically stated in a Product License
Agreement, COMMODORE warrants the PC10 Diagnostics product,
(SYSTEM Diskette media on which programs are recorded, TEST
Diskettes, TEST Plugs, Diagnostics Manual and other
documentation, and miscellaneous product items), to be free from
any defects in materials or faulty workmanship, in normal use and
service, for a period of ninety (90) days from the date of
purchase. COMMODORE shall not be responsible for any deunage
caused to the product by the purchaser.
Page 4
PC10 DIAGNOSTICS
OVERVIEW
The information in this manual is both introductory and for
reference. A considerable amount of attention has been given to
providing information and instructions of the system's display to
aid in the use of PC10 Diagnostics and to minimize the need for
extensive documentation.
The PC10 Diagnostics, Professional Level Personal Computer
Diagnostics System, consists of ...
(1) SYSTEM DISKETTE (COPY PROTECTED)
(2) TEST DISKETTES (SPECIALLY FORMATTED)
(1) PARALLEL PORT TEST PLUG
(1) SERIAL PORT TEST PLUG
(1) PC10 DIAGNOSTICS MANUAL
(1) RUGGED CARRYING CASE
PC10 Diagnostics is intended to assist you in certifying the
operation of the system and testing to locate and diagnose
hardware failures. In addition, to the certification and
diagnostic features, PC10 Diagnostics includes features to assist
in determining the system's configuration.
Primary uses of PC10 Diagnostics are in initial system setup and
burnin, testing and diagnosis of a malfunctioning system and
recertification after repair. PC10 Diagnostics enables you to
quickly test a system's hardware devices and components to
determine the nature of a reported problem without disassembly of
the system. When a hardware failure is detected, PC10 Diagnostics
allows you to identify the failing device and in many cases
localize the failure to the component or address level.
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COMMODORE PC10 DIAGNOSTICS
LOADING PC10 DIAGNOSTICS
1) INSERT PC10 DIAGNOSTICS SYSTEM DISKETTE INTO DRIVE A:
2) POWER ON THE SYSTEM AND ALL EXTERNALLY ATTACHED DEVICES
OR
RESET THE SYSTEM BY HOLDING THE [CTRL] AND [ALT] KEYS
AND PRESS [DEL] KEY
PC10 DIAGNOSTICS MAY TAKE AS LONG AS 60 SECONDS TO LOAD
DEPENDING ON THE SYSTEM CONFIGURATION
DURING THE LOAD PHASE, GENERAL TESTS ARE MADE TO INSURE
THAT THE SYSTEM HARDWARE, (ESPECIALLY MEMORY), IS
FUNCTIONING SUFFICIENTLY TO ALLOW PC10 DIAGNOSTICS TO BE
LOADED AND OPERATED.
IF THE INITIAL MEMORY ERROR, (16K TO 70K), CONTAINS A
FAILING IC, AN ERROR MESSAGE IS DISPLAYED AS ...
** MEMORY ERROR - LOCATION XXXX:0
SEARCHING FOR GOOD MEMORY
......
THE PC10 DIAGNOSTICS WILL THEN CONTINUE LOOKING FOR
CONTINUOUS MEMORY IN WHICH TO LOAD.
THE PROGRAM IS THEN LOADED FROM THE TOP SIDE OF THE SYSTEM
DISKETTE. IF THE UPPER READ/WRITE HEAD OF THE DRIVE FAILS
TO OPERATE CORRECTLY, AN ERROR MESSAGE IS DISPLAYED AS ...
** READ ERROR - HEAD 0 (TOP SIDE)
ATTEMPTING TO READ FROM HEAD 1 (BOTTOM SIDE)
IF THE LOWER READ/WRITE HEAD OF THE DRIVE FAILS TO OPERATE
CORRECTLY, AN ERROR MESSAGE IS DISPLAYED AS ...
** FAILURE TO READ FROM HEAD 1 (BOTTOM SIDE)
TERMINATING LOADING OPERATION
IF THE MAIN MENU IS DISPLAYED CONTINUE PAGE 1
***** PC10 DIAGNOSTICS OPERATION INSTRUCTIONS *****
IF AN ERROR IS ENCOUNTERED ....
1) REMOVE THE DISKETTE AND VERIFY THAT ...
A) IS THE PC10 DIAGNOSTICS SYSTEM DISKETTE
B) WAS INSERTED CORRECTLY INTO THE DRIVE
2) RETRY THE LOADING PROCESS AGAIN USING THE KEYBOARD
RESET SEQUENCE, HOLD [CTRL] AND [ALT], PRESS [DEL]
3) IF THE PC10 DIAGNOSTICS STILL DOES NOT LOAD ...
A DEFECTIVE DRIVE ASSEMBLY OR PCB IS INDICATED.
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PC10 DIAGNOSTICS
TABLE OF CONTENTS
***** MAIN MENU *****
1) CONFIGURATION MENU PAGE 1
A) SYSTEM CONFIGURATION CHARTS PAGE 2
2) CERTIFICATION MENU PAGE 3
***** DIAGNOSTICS MENU *****
3) KEYBOARD TEST
4) DISPLAY TEST
5) PARALLEL INTERFACE TEST
A) DATA/CONTROL/STATUS BIT CHART
6) DISK DRIVE TESTS
A) FIXED DISK TEST PAGE 9-13
B) DISKETTE DRIVE TESTS PAGE 14-17
7) SERIAL INTERFACE TEST
A) DATA/CONTROL/STATUS BIT CHART
8) MEMORY TESTS
A) STANDARD MEMORY CONFIGURATION CHARTS
1) PC10-I / PC10-II
2) PC10-III / PC20-III / PC COLT
3) A2000 PC MODE
B) MEMORY LOCATION FAILURE CHARTS
1) PC10-I / PC10-II
2) PC10-III / PC20-III / PC COLT
3) A2000 PC MODE
C) MEMORY BIT FAILURE CHARTS
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PAGE 5
PAGE 6-8
PAGE 8
PAGE 18-19
PAGE 20
PAGE 21-23
PAGE 24
PAGE 25
PAGE 26
PAGE 27
PAGE 28
PAGE 29
1) PC10-I / PC10-II
2) PC10-III / PC20-III / PC COLT
3) A2000 PC MODE
PAGE 30
PAGE 31
PAGE 32
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
MAIN MENU
[ F2] - Configuration Menu
[ F3] - Certification Menu
[ F5] - Diagnostics Menu
[F10] - Help Menu
[F2] - CONFIGURATION MENU
This option allows the ability to display System Configuration
and verify all installed devices are recognized.
A) Current Configuration
* System Type
* 8087 Math Co-Processor
* Amount of Main Memory
* Number of Serial Ports
* Number of Parallel Ports
* Number of Diskette Drives
* Number of Fixed Disk Drives
* Type of Video Interface
B) Configuration History
Displays the Current Configuration of the Test System and
allows this information to be saved to disk and recalled
for future reference.
C) Switch Positions
VALID FOR PC10-I AND PC10-II ONLY
Displays the status of the System Configuration Switches by
number and current state, (ON or OFF).
* Refer to System Configuration Chart — Page 2
for detailed configuration information
Displayed as Commodore PC10
Installed or Not Installed
512 or 640 Kbytes
Standard = 1 — A2000 = 0
Standard = 1
Normally = 1 or 2
If Hard Disk is Installed
* Drive #
* Number of Cylinders
* Number of Heads
Normally 40 x 25 Color
or 80 x 25 Mono
D) Memory Size
Displays System Memory Configuration
* System - Actual Memory Installed (512 or 640K)
* POST - Lower Value of either (512 or 640K)
* Configuration Switch Settings or
* Upper Limit of the last 64K Block of
Contiguous Good Memory as tested by POST
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
SYSTEM CONFIGURATION CHART PC10-I / PC10-II
SWITCH POSITION FUNCTION
1
2
3,4
5,6
7,8 ON, ON FLOPPY DRIVES = 1 OFF,ON
Commodore PC10-III, PC20-III and PC COLT Video Control Dip
Switches are located in the back of the system. The Positions can
be interpreted as ...
SYSTEM CONFIGURATION CHART PC10-III / PC20-III / PC COLT
SWITCH POSITION FUNCTION POSITION FUNCTION
1 OFF CHARACTER SET ON CHARACTER SET
2 OFF
3,4 OFF,OFF
OFF
OFF
ON, ON RAM SIZE = 128K
ON,OFF RAM SIZE = 512K
ON, ON MONO 40X25
ON,OFF
ON,OFF FLOPPY DRIVES = 3 OFF,OFF
ON,OFF
NORMAL BOOT ON
8087 INSTALLED
COLOR 80X25 OFF,OFF
USA/EUROPE SCANDINAVIAN
ONBOARD VIDEO
MONOCROME COLOR
MONO VIDEO
40X25 COLOR VIDEO
CARD INSTALLED INSTALLED
POSITION
SYSTEM DIAGNOSTIC
ON
OFF,ON
OFF,OFF
OFF,ON COLOR 40X25
ON ONBOARD VIDEO
OFF,ON 80X25 COLOR VIDEO
ON, ON
8087 NOT INSTALLED
RAM SIZE = 256K
RAM SIZE = 640K
MONO 80X25
FLOPPY DRIVES = 3
FLOPPY DRIVES = 4
NO VIDEO CARD
FUNCTION
Commodore PC10-III, PC20-III and PC COLT Hard Drive Control
and Composite Video Jumpers are located on the Main PCB of the
system and the Positions can be interpreted as ...
JUMPER
JMP208 A
JMP614 IN
POSITION
B
OUT
COMMODORE HARD DISK NOT INSTALLED OR
HARD DISK INSTALLED IN EXPANSION SLOT
COMMODORE HARD DISK INSTALLED
COMPOSITE COLOR OUTPUT
MONOCROME VIDEO OUTPUT
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FUNCTION
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F3] - CERTIFICATION MENU
This option provides Two (2) System Level Tests to certify System
Hardware Operation.
A) Fast System Test
B) Extended System Test
Both options require PC10 Diagnostics Test Diskettes to be
inserted in all Floppy Drives installed and Serial (RS232) and
Parallel Interface Test Plugs to be plugged in to all ports.
The following Diagnostic Tests are executed ....
1) System Board
2) Math Co-Processor
3) Memory = (Size)
4) Diskette Drive
5) Fixed Disk
6) Serial I/O
7) Parallel I/O
Normally Not Installed
All Memory Tests Executed
Read/Write To All Floppy Drives
Hard Drive Verification
* If Installed
Serial RS232 Data and Interface
Tests
* Not Valid For A2000
Parallel Data and Interface Tests
* Not Valid For A2000
A) FAST SYSTEM TEST
Used to quickly certify correct Hardware Operation. This test may
run from 30 to 90 seconds depending on the amount of System RAM.
B) EXTENDED SYSTEM TEST
Used to perform a Continuous Loop Test to detect Intermittent
Hardware Failures. This test will continue to execute until
interrupted by Pressing [ESC]. The Number of Passes is displayed
during run time.
If an error occurs during any of these tests, Select [F5] Option,
Diagnostic Menu, from the Main Menu for Extensive Testing of the
Failure.
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F5] - DIAGNOSTIC MENU
This option provides Six (6) Component Level Option Menus to
assist in locating and troubleshooting failures detected during
the Certification Tests.
[F2] - Keyboard
[F3] - Display
[F4] - Parallel Interface
[F5] - Diskette and Fixed Disk Drives
[F6] - Serial Interface
[F7] - Memory
The available tests in these menus perform extensive testing of
the System Component in question to verify correct operation as
well as reporting the error condition and location/address.
[F2] - KEYBOARD TEST
Two (2) Keyboard Configurations are supported by the PC10 System
Diagnostics.
A) Standard Keyboard
B) Enhanced Keyboard
ALTHOUGH THE AVAILABLE KEYBOARD CONFIGURATIONS DO NOT
MATCH THE A2000 KEYBOARD LAYOUT, THE DISPLAYED KEY
BEING PRESSED IS STILL CORRECTLY DISPLAYED
When the Keyboard Configuration has been selected the correct
keyboard layout is displayed. As each key is depressed, the
corresponding key location will be reversed verifying proper
keyboard operation. The Character, (Alpha and Numeric Keys Only),
Hex Code and Scan Code of each key are also displayed.
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F3] - DISPLAY TEST
This option allows Two (2) separate display functions.
1) Alignment Aids
2) Display Tests
1) ALIGNMENT AIDS
A) Cross-Hatch Pattern
B) Dot Pattern
C) Vertical Bars
D) Horizontal Bars
E) Color Chart
These options are used to adjust the monitor for correct
alignment, both vertical and horizontal, as well as color
sharpness and tint.
2) DISPLAY TESTS
F) Verify Screen Memory
G) Character Set
H) Video Attributes
I) Fill Display With a Character
J) Test Cursor Addressing
These options are used to test System Video Operations such as
Screen Memory, Attributes, (Blinking, Intensity, etc), and Cursor
Addressing.
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F4] - PARALLEL INTERFACE
VALID FOR PC10 ONLY - A FAILURE WILL OCCUR ON THE A2000
A TEST PLUG MUST BE CONNECTED TO EACH PARALLEL PORT TO BE
TESTED OR A FAILURE WILL OCCUR DURING THE STATUS TEST
A) Verify Parallel Printer Port(s)
This option is used to verify correct operation of the Internally
Installed Parallel Printer Port, (LPT1), and can also be used to
test optionally installed cards.
Three (3) separate tests are executed during the Parallel Test.
1) Data
2) Control
3) Status
If a failure occurs during this test, an error code will be
displayed and can be interpreted as ...
ERROR CODE FORMAT = Pptxx
P = Parallel Interface Failure
p = Interface Port Where Failure Occurred
1 = LPT1
2 = LPT2
3 = LPT3
t = Test Where Failure Occurred
0 = Data Test
1 = Control Test
2 = Status Test
xx = Data Bits Which Failed
* Refer To Data/Control/Status Bit Chart — Page 8
The [xx] Error Codes for each test is ...
DATA TEST - Each bit in the error code represents a data bit in
the internal circuitry.
1st [x] 2nd [x]
Bits 7654 3210
EXAMPLE ERROR CODE - [xx] = 0 1 Data Bit 0 Failure
[xx] = 80 Data Bit 7 Failure
[xx] = FF All Data Bits Failed
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
CONTROL TEST - Each bit in the error code represents a data bit
in the internal circuitry. The Four (4) Most
Significant Bits are not used in this error code
allowing Valid Codes from 01 thru OF Only.
Bits 7654 3210
NOT USED Error
Auto Feed
Initialize Printer
Select Input
EXAMPLE ERROR CODE - [xx] = 0 1 Error Signal Failure
[xx] = 08 Select Input Signal Failure
[xx] = OF All Control Signals Failed
STATUS TEST - Each bit in the error code represents a data bit in
the external circuitry. The Three (3) Least
Significant Bits are not used in this error code
allowing Valid Codes from 08 thru F8 Only.
Bits 7654 3210
Error
Select
Paper Out
Acknowledge
Busy
EXAMPLE err or CODE - [xx] = 08 Error Signal Failure
[xx] = 80 Busy Signal Failure
[xx] = F8 All Status Signals Failed
SIGNAL
SIGNAL
OPTIONS [B-E] REQUIRE A PARALLEL PRINTER TO BE CONNECTED
TO THE PORT FOR PROPER OPERATION. THE PARALLEL PRINTER
PORT NUMBER MUST BE ENTERED AFTER EACH OPTION IS SELECTED
B) Character Set Printed
C) Echo The Keys Pressed To Printer
D) Monitor Handshake and Data Signals While Printing
E) Monitor Handshake and Data Signals
These options are used to verify correct operation of any
Standard Centronics Parallel Printer connected to the system.
B) Character Set Printed
* Prints a rolling character set of each ASCII Character
to both printer and screen. To verify printer operation,
the hard copy printout should match the screen display.
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
C) Echo The Keys Pressed To Printer
D) Monitor Handshake And Data Signals While Printing
E) Monitor Handshake And Data Signals
* Displays the status of the Parallel Port Handshake Lines
as printing is being performed from each option.
PARALLEL INTERFACE DATA/CONTROL STATUS BIT CHART
BIT
1ST
[X]
7 6
0 O 0
1 O 0
5 4 3 2 1 0
0 0
F 1 O
0
2ND
[X]
0
2 0 0 F 0 2 0
3 o O
4 o F
5 o F
6 o F
7 o F
8
F 0 0 O 8
9 F O
A F 0
B
C
F 0
F F O 0 C
D F F
F F 3 O o F
0 0 4 0
0 F 5 O F O F
F 0 6 0 F F 0
F F 7 0 F F F
0 F 9 F O O F
F 0 A F 0 F 0
F F B F 0 F F
O F D
E F F F 0 E
F F F
F F
F
O = PASS (OFF) F = FAIL (ON)
BIT
0 0 O O
O o F
o F 0
O
F
F 0 0 0
F F 0 0
F F
0
F F F 0
F F F F
F
0
F
EXAMPLE ERROR CODE - [X X]
[XX]
02 = Error Code OOOO OOFO
* Data Bit 1 Failing
4A = Error Code OFOO FOFO
* Data Bits 1/3,6 Failing
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F5] - DISK DRIVE
This option supports testing of both Fixed Disk, (Hard Drive),
and Standard Floppy Drives, (5 1/4" A and B).
A) Fixed Disk Test
B) Diskette Drive Test
A) FIXED DISK TEST
This test contains Eight (8) options for Hard Drive.
A) Select Drive For Testing
A DRIVE MUST BE SELECTED BEFORE ANY OF THE OTHER AVAILABLE
OPTIONS ARE USED
This option allows selection of the drive to be tested, either
Drive 0, (C) , or Drive 1, (D) .
If only one (1) Hard Drive is installed, Drive 0 is selected by
default.
The Drive Number, Number of Cylinders, Number of Heads and Number
of Sectors Per Track is displayed for all Hard Drives Installed.
B) Controller Test
C) Seek (Hysteresis) Test
D) Write/Read Verify Test
E) Read (CRC) Test
* F) Format Fixed Disk
* G) Unconditional Format Fixed Disk
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
If a failure occurs during any of these tests, an error code will
be displayed and can be interpreted as ...
ERROR CODE FORMAT = Fdxx
F = Fixed Disk Failure
d = Drive Number Where Failure Occurred
0 = Drive 0 (Drive C)
1 = Drive 1 (Drive D)
xx = Type of Error Encountered
00 = OK No Error
01 = Bad Command
02 = Address Mark Not Found
04 = Requested Sector Not Found
05 = Reset Failed
07 = Drive Parameter Activity Failed
09 = DMA Boundary Error
0B = Bad Track Flag Detected
10 = Read Error, Bad ECC
11 = Error Corrected by ECC
20 = Controller Failure
40 = Seek Operation Failure
80 = Attachment (Board) Failed To Respond
Time Out Error
BB = Undefined Error Occurred
FF = Sense Operation Failed
EXAMPLE ERROR CODE - F040 = Seek Operation Failure
on Drive 0 (Drive C)
B) CONTROLLER TEST
This option perforins three (3) tests on the Hard Drive Controller
* PC10-I - PC10-II
* PC10-III - PC20-III - PC COLT
* A2000
1) Controller Internal Diagnostic
2) Controller RAM Diagnostic
3) Controller Drive Diagnostic
C) SEEK (HYSTERESIS) TEST
When this option is selected, select the test type mode by ...
1) Press [Y] - Test will continue running until interrupted
2) Press [N] - Test will conclude after one (1) Pass
3) Press [ESC] - Abort Test Mode Selection
This option tests the seek capabilities of the Hard Drive by
seeking each cylinder consecutively, (0-614). Hysteresis is
checked by seeking cylinder 0 between each Cylinder Seek.
--
Optional Controller Card
---
Built In Controller
--
Built In Controller On
The A2088 Bridge Card
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
When cylinder 614 is reached, a seek is performed on each
cylinder consecutively, (614-0). Hysteresis is checked by seeking
cylinder 614 between each Cylinder Seek..
The Drive, Head and Cylinder being tested as well as the Number
of Passes and Total Errors Encountered are displayed.
D) WRITE/READ VERIFY TEST
This test allows two (2) test option selections
A) Test The Entire Fixed Disk Surface
B) Test Only The Service Cylinder
A) TEST THE ENTIRE FIXED DISK SURFACE
ALL DATA STORED ON THE SELECTED HARD DRIVE WILL BE DESTROYED
If this option is selected, a confirmation menu is displayed.
Press
1)
** ALL STORED DATA WILL BE LOST !!!!!
2)
When the [Y] option is selected, select the test type mode by ...
2) Press [N] - Test will conclude after one (1) Pass
This option tests the Write capability of the Hard Drive by
Writing Data to each cylinder, (0-614), on all Heads.
When Data has been written, the Read capability of the Hard Drive
is tested by Reading and Verifying the Written Data.
The Drive, Head and Cylinder being tested as well as the Number
of Passes and Total Errors Encountered are displayed.
B) TEST ONLY THE SERVICE CYLINDER
Press [N] No. Exit Test
Press [ESC] - Exit Test
3)
1) Press [Y] - Test will continue running until
3) Press [ESC] - Abort Test Mode Selection
[Y]
STORED DATA IS NOT EFFECTED BY THIS TEST
Yes, Continue
interrupted
When this option is selected, select the test type mode by ...
1) Press [Y] - Test will continue running until interrupted
2) Press [N] - Test will conclude after one (1) Pass
3) Press [ESC] - Abort Test Mode Selection
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
This option tests the Write capability of the Hard Drive by
Writing Data to cylinder (614 Only), on all Heads.
When Data has been written, the Read capability of the Hard Drive
is tested by Reading and Verifying the Written Data.
The Drive, Head and Cylinder being tested as well as the Number
of Passes and Total Errors Encountered are displayed.
E) READ (CRC) TEST
STORED DATA IS NOT EFFECTED BY THIS TEST
When this option is selected, select the test type mode by ...
1) Press [Y] - Test will continue running until interrupted
2) Press [N] - Test will conclude after one (1) Pass
3) Press [ESC] - Abort Test Mode Selection
This option tests the Read capability of the installed Hard Drive
by Reading all cylinders, (0-614), on all Heads.
The Drive, Head and Cylinder being tested as well as the Number
of Passes and Total Errors Encountered are displayed.
F) FORMAT FIXED DISK
This is the recommended option for Hard Disk Drive Low Level
Formatting and should work on most standard drives.
* If an error occurs during this format, the Hard Drive being
used may be Non-Standard and the [G] UNCONDITIONAL FORMAT
Option should be attempted.
G) UNCONDITIONAL FORMAT FIXED .DISK
This is a Last Resort Option for Hard Disk Drive Low Level
Formatting and should be used ONLY if the [F] FORMAT FIXED DISK
Option Fails.
ALL DATA STORED ON THE SELECTED HARD DRIVE WILL BE DESTROYED.
These options display the number of Hard Drives installed and
allow selection of drive to be formatted.
** C = Drive 0 ** d = Drive 1
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
When the drive has been selected, the Interleave Value, (1-16),
of the drive must be entered.
* Default = 6 (Most Hard Drives)
IF NECESSARY, REFER TO THE HARD DRIVE
SPECIFICATIONS TO OBTAIN THIS VALUE
When the Interleave Value has been entered, a confirmation menu
is displayed.
1) Press [Y] - Yes, The Drive Will Be Formatted
** ALL STORED DATA WILL BE LOST !!!!!
2) Press [N] - No, The Drive Will NOT Be Formatted
If [Y] - Yes is selected, a Low-Level Format is performed on the
Hard Drive. A Flashing FORMATTING Message is displayed while the
format is be executed.
H) PARK HEADS
This option is used to park the heads of the Hard Drive on the
Last Cylinder, (Service Cylinder).
To help insure against damage to the hard drive which may result
in lost data, the heads should be parked whenever the system is
to be moved.
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
B) DISKETTE DRIVE TEST
This test contains Seven (7) options for Floppy Drive Testing
A) Specify Diskette Drive to Test
A DRIVE MUST BE SELECTED BEFORE ANY OF THE OTHER AVAILABLE
OPTIONS ARE USED
This option allows selection of the drive to be tested, either
Drive A, Drive B, Drive C or Drive D.
When the drive has been selected Press [RETURN] to Continue
ALL OPTIONS [B-G] REQUIRE THE PC10 TEST DISKETTES
BE INSERTED IN THE DRIVE UNDER TEST
IF THESE DISKETTES ARE DAMAGED OR NOT AVAILABLE, NEW TEST
DISKETTES MAY BE MADE BY FORMATTING BLANK DISKETTES USING
OPTION [G] - FORMAT TEST
B) Rotational Timing Test
C) Seek/Read Test
D) Write Protect Verification Test
E) Read Only Test
F) Format Test
G) Write/Read Verify Test
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
If a failure occurs during any of these tests, an error code will
be displayed and can be interpreted as ...
ERROR CODE FORMAT = Ddxx
D = Disk Drive Failure
d = Drive Number Where Failure Occurred
0 = Drive A
1 = Drive B
2 = Drive C
3 = Drive D
xx = Type of Error Encountered
00 = OK No Error
01 = Controller Status Error
02 = Drive Start Failure
04 = Controller Ready Failure
05 = Controller Direction Error
06 = Recalibrate Error
07 = Reset Error
08 = Read Error
09 = Start Error
0A = Write Error
0B = Data Error
0C = System Diskette Installed in Drive
0D = Incorrect Test Diskette Installed in Drive
0E = Diskette is Write Protected
EXAMPLE ERROR CODE - D109 = Start Error on Drive B
DO08 = Read Error on Drive A
B) ROTATIONAL TIMING TEST
This option is used to measure the speed of the drive. Speed is
measured in RPMs with Current Speed, Slowest Measured Speed and
Fastest Measured Speed displayed.
* Optimal Speed is 300 RPM
If the speed reading is OFF, the speed should be adjusted until
the displayed reading = 300 RPM.
* speed is adjusted by turning a Variable POT on the drive
** The location of this POT may vary from Drive to Drive
but is normally located on the Drive Servo PCB and
accessed from the bottom of the drive assembly.
C) SEEK/READ TEST
This option is used to test the Seek and Read Operations of the
Drive by seeking random tracks, First Side 1 then Side 2, and
reading the worst case data pattern written on the test diskette.
If a Seek Error is encountered, an 'S' will be displayed
designating the Track, (0-39), and Side, (1 or 2), where the
error occurred. Total Seek Errors are also displayed.
Page 15
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
D) WRITE PROTECT VERIFICATION TEST
This option is used to test the Write Protect Sensor on the Drive
as well as the Write Protect Circuitry on the PCB.
1) Insert a Write Protected Test Diskette — Press [RETURN]
* Write Protected = Write Protect Tab ON
2) Insert a Un-Write Protected Test Diskette — Press [RETURN]
* Un-Write Protected = Write Protect Tab OFF
Write Protect Pass/Fail Status is displayed.
E) READ ONLY TEST
This Option is used to test the Read Capabilities of the Drive
by Reading and Verifying the Data from the Test Diskette. Data
is read from all Tracks, (0-39), and all Sectors, (0-9), on both
sides, (0-1), of the Test Diskette.
If a Read Error is encountered, either an 'S', (Soft Error), or
'H', (Hard Error), will be displayed designating the Track,
(0-39), and Sector, (1-9), where the error occurred. Total Read
Errors are also displayed.
* Soft Error = A Recoverable Error
* Hard Error = An Unrecoverable Error (4 Soft Errors)
F) FORMAT TEST
This Option is used to test the Format and Write Operations of
the drive by First Formatting a Track then Writing a Worst Case
Data Pattern to the Formatted Track.
When the Data Pattern has been written to all Sectors, (1-9), of
all Tracks, (0-39), the Data Pattern is read and compared to the
written data pattern.
This procedure is done on Side 0 then repeated for Side 1.
If an Error is encountered, either an 'F', (Format Error),
•S', (Soft Error), 'H', (Hard Error) or 'C', (Compare Error) will
be displayed indicating the Track, (0-39), and Sector, (1-9),
where the error occurred.
* Format Error
* Soft Error
* Hard Error
* compare Error
Hard Error During Format Operation
A Recoverable Error
An Unrecoverable Error (4 Soft Errors)
Data Read <> Data Written
Page 16
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
The results of this test can also be interpreted as a measure of
Diskette Quality as a failure here caused by a diskette is an
indication of either a defective or sub-standard diskette.
IF AN ERROR OCCURS DURING TESTING, THE TEST SHOULD BE RERUN
USING A KNOWN GOOD HIGH QUALITY DISKETTE
DISKETTES WHICH PASS THIS TEST BECOME PC10 DIAGNOSTICS TEST
DISKETTES AND MAY BE USED FOR ALL TESTS REQUIRING THEM
G) READ/WRITE VERIFY TEST
This Option is used to test the Read and Write Operations of the
drive by Writing a Worst Case Data Pattern to all Tracks, (0-39),
and all Sectors, (1-9).
When the Data Pattern has been written the Data is read and
compared to the written data pattern.
This procedure is done on Side 0 then repeated for Side 1.
If an Error is encountered, either a 'W', (Write Error),
'S', (Soft Error), 'H', (Hard Error) or 'C', (Compare Error) will
be displayed indicating the Track, (0-39), and Sector, (1-9),
where the error occurred.
* Write Error = Hard Error During Write Operation
* Soft Error = A Recoverable Error
* Hard Error = An Unrecoverable Error (4 Soft Errors)
* Compare Error = Data Read <> Data Written
A total of encountered errors by type is displayed.
Page 17
Page 25
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F6] - SERIAL INTERFACE
VALID FOR PC10 AND PC20 ONLY - NO TEST IS EXECUTED ON A2000
This option is used to verify correct operation of the Internally
Installed Serial, (RS232), Port, (COM1), and can also be used to
test optionally installed cards.
Two (2) Serial Port Tests are supported by this option.
A) Test Internal Operation
* Test Plug Not Required
B) Test Interface (Recommended)
* Test Plug Required
Three (3) separate tests are executed during each Serial Test.
1) Transmitter Test
2) Receiver Test
3) Data Test
4) Interface Test
If a failure occurs during this test, an error code will be
displayed and can be interpreted as ...
ERROR CODE FORMAT = Sptxx
S = Serial Interface Failure
p = Interface Port Where Failure Occurred
1 = COMl
2 = COM2
t = Test Where Failure Occurred
1 = Transmitter Test
2 = Receiver Test
3 = Data Test
4 = Interface Test
xx = Either a Status Code or an Error Code
Depending on Selected Test Option
* A) Test Internal Operation
* B) Test Interface
** Refer To Data/Control/Status Bit Chart - Page 20
Both Serial Tests
Both Serial Tests
Internal Serial Test
Interface Serial Test
Data Error Code
Status Error Code
Page 18
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
The [xx] Error Codes for each test are ...
TRANSMITTER AND RECEIVER TEST - Each bit in the Error Code
indicates the Status of the UART Circuitry.
1ST 'X' 2ND 'X'
Bits 7654 3210 SIGNAL
Data Ready Flag
Overrun Error
Parity Error
Framing Error
Break Interrupt
Detected
Transmitter Empty
Transmitter Shift
Register Empty
Not Used
EXAMPLE ERROR CODE - [xx] = 0 1 Data Ready Flag Error
[xx] = 2 0 Transmitter Empty Error
[xx] = FF All Control Signals Failed
DATA TEST - (INTERNAL TEST ONLY) Each bit in the error code
represents a data bit in the internal circuitry.
1st [x] 2nd [x]
Bits 7654 3210
EXAMPLE ERROR CODE - [xx] = 0 1 Data Bit 0 Failure
[xx] = 80 Data Bit 7 Failure
[xx] = FF All Data Bits Failed
INTERFACE TEST - (INTERFACE TEST ONLY) Each bit in the error code
represents a Status Bit in the External
Interface by reading the Modem Status Register.
The Four (4) Most Significant Bits are not used
in this error code allowing Valid Codes from 01
thru 08 Only.
Bits 7654 3210 SIGNAL
NOT USED Clear To Send
Data Set Ready
Ring Indicator
Receiver Signal
Detected
EXAMPLE ERROR CODE - [X X]
[XX]
[XX]
08 Receiver Detect Error
01 Clear To Send Error
OF All Status Signals Failed
Page 19
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
O = PASS (OFF) F = FAIL (ON)
EXAMPLE ERROR CODE - [ XX] = 08 = Error Code OOOO FOOO
* Data Bit 3 Failing
[xx] = 9C = Error Code FOOF FF00
* Data Bits 7/4,3/2 Failing
Page 20
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
[F7] - MEMORY
These options are used to verify correct system memory operation.
Tests are available to detect both Hard RAM Failures as well as
Intermittent or Parity Errors.
A) Fast System Test
B) Extended System Test
A) FAST SYSTEM TEST
This Option is used as a quick memory test to detect Hard RAM
Failures. Four (4) types of RAM Tests are executed. This option
will execute one complete pass then halt.
1) All Zeros - Check for Bits Stuck High
2) All Ones - Check for Bits Stuck Low
3) Checkerboard - Check for Alternating Bits
4) Address - check for HIGH Parity Errors
* The above RAM Tests, (1-3), Produce a
Data Pattern which has an EVEN
Parity. If a Parity Chip is failing
in a HIGH State or is not installed,
a Parity Error would be detected ONLY
by the Address Test.
B) EXTENDED SYSTEM TEST
This Option is used as a Burn-In Memory Test to detect Hard RAM
Failures or Intermittent Failures. Five (5) types of RAM Tests
are executed. This test will continue to execute until manually
interrupted by Pressing [ESC].
1) All Zeros - Check for Bits Stuck High
2) All Ones - Check for Bits Stuck Low
3) Checkerboard - Check for Alternating Bits
4) Address - Check for HIGH Parity Errors
* The above RAM Tests, (1-3), Produce a
Data Pattern which has an EVEN
Parity. If a Parity Chip is failing
in a HIGH State or is not installed,
a Parity Error would be detected ONLY
by the Address Test.
5) Marching Ones - Check for Stuck Bits
* A '1' Bit is rolled through each
Memory Location within the specified
address range.
Page 21
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COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
If a failure occurs during these tests, an error code will be
displayed and can be interpreted as ...
ERROR CODE FORMAT = MtblPxx
M = Memory Failure
t = Test Which Indicated the Failure
0 = ALL ZEROS Test 3 = ADDRESS Test
1 = ALL ONES Test 4 = MARCHING ONES Test
2 = CHECKERBOARD Test 5 = BANK Test
b = Memory Bank, (0-9), Containing Failure
1 = Position of Error relating to 16K Block
A = 00K thru 16K C = 32K thru 48K
B = 16K thru 32K D = 48K thru 64K
P = Parity Bit Failure
* Blank Space if Parity Test Passes
xx = Physical Location of Failed RAM
* Refer To Memory Location Failure Chart - Page 27-29
EXAMPLE ERROR CODE = M10A 02
M10A = Memory Failure During ALL ONES Test in
Bank 0 of Memory Block 00-16K
02 = Error Code OOOO OOFO
* Failure U28 - PC10-I/PC10-II MAIN PCB
* Failure U311 - PC10/20-III/PC COLT
* Failure U13 - A2088 BRIDGE BOARD
EXAMPLE ERROR CODE = M25D F0
M25D = Memory Failure During CHECKERBOARD Test
in Bank 5 of Memory Block 48-64K
F0 = Error Code FOOO OOOO
* Failure U1 - PC10-I/PC10-II EXPANDER
* Failure U313 - PC10/20-III/PC COLT
* Failure U27 - A2088 BRIDGE BOARD
C) ALLZERO Memory Test
D) ALLONES Memory Test
E) CHECKERBOARD Memory Test
F) ADDRESS Memory Test
G) MARCH Memory Test
These options allow Individual Memory Tests to be executed for
assistance in detailed component troubleshooting.
The Memory Bank under test, Test Results, Failed Range and Failed
Bit Position is displayed during these tests.
These tests will continue to execute until manually interrupted
by Pressing [ESC].
Page 22
Page 30
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
Note that during all Memory Test Options, (A thru G), the 64K
Memory Block, OOOOO-OFFFF, Bank 0 and part of the 64K Memory
Block, 10000-1FFFF, Bank 1 is not tested. This is the area of
memory where the PC Diagnostics Program resides.
If all Memory Banks, (1-7) PC10-I, A2000, (1-9) PC10-II,
PC10-III, PC20-III, PC COLT, pass the Diagnostic Tests, Bank 0 is
tested by selecting option [H] - Select Memory Testing Range and
entering a STARTING ADDRESS OF 0600 and ENDING ADDRESS OF 2000.
This insures that selected tests are executed on all RAM skipped
by standard testing.
H) Select Memory Testing Range
This option allows selected tests to be executed on a specific
area of memory. This is very useful when it becomes necessary to
isolate or verify a certain area of System Memory.
EXAMPLE - Enter Starting Address of 2000
Enter Ending Address of 3000
* Executes Selected Tests on Memory Bank 2, 20000 - 2FFFF Only
If an error is detected during individual Memory Tests,
Options (C thru H), the Failure Range and Bit Failure Code is
displayed indicating the location of the failing memory bit.
** Refer to Memory Bit Failure Chart — Pages 30-32
Page 23
Page 31
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
PC10-I / PC10-II STANDARD MEMORY CONFIGURATION CHART
SYSTEM TYPE
PC10-I
PC10-II
RAM MAIN PCB
512K 256K
640K 256K
BANKS
0 - 3
0 - 3
EXPANSION PCB BANKS
256K 4 - 7
384K 4 - 9
MAIN PCB BANKS 0 - 3 RAM ICS = 41256 (256K X 1)
U22 U23 U24 U25 U26 U27 U28 U29 U30
U1 U2 U3 U4 U5 U6 U7 U8
BIT
3
BIT BIT BIT BIT
4 5 6 7
2ND 'X'
RAM EXPANSION PCB BANKS 8 - 9 RAM ICS = 41464 (64K X 4)
U9
U10
INSTALLED IN 64OK SYSTEM ONLY
Ull U12 U13 U14 U15
_____
BIT
P
>ani
BANKS
4-7
Page 24
Page 32
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
PC10/20-III / PC COLT STANDARD MEMORY CONFIGURATION CHART
SYSTEM TYPE RAM
PC10-III
640K
PC20-III 640K 640K
PC COLT
640K 640K
MAIN PCB
640K
BANKS
0-9
0-9
0-9
EXPANSION PCB
MAIN PCB BANKS 0 - 3 RAM ICS = 41256 (256K X 1)
U305 U306 U307 U308
U309 U310 U311 U312
BIT BIT BIT BIT BIT BIT BIT
0 1 2 3 4 5 6 7
1ST X'
2ND
MAIN PCB BANKS 4 - 7 RAM ICS = 41256 (256K X 1)
U313 U314 U315 U316 U317 U318 U319
BANKS
BIT
U320
BIT BIT BIT BIT
BIT BIT BIT BIT
0 1 2 3 4 5 6
•
• 1ST ''X'
4» 4
1 4
>
» 2ND 1
MAIN PCB BANKS 8 - 9 RAM ICS = 41464 (64K X 4)
U322 U321 U324 U323
BIT
0-3
1ST 'X'
BANK
8
BIT
4-7
BIT
0-3
BANK
2ND 'X'
BIT
4-7
9
Page 25
7
X'
Page 33
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
A2000 PC MODE STANDARD MEMORY CONFIGURATION CHART
SYSTEM TYPE RAM
A2000
512K
MAIN PCB
BANKS
BRIDGE BOARD BANKS
o
512K
i
A2088 BRIDGE BOARD BANKS 0 - 3 RAM ICS = 41256 (256K X 1)
U19 U18 U17
BIT
0
BIT
1
1ST
BIT
2
X'
U16 U15 U14
BIT
3
BIT
4
BIT
5
2ND
U13 U12
BIT
6
BIT
7
X'
A2088 BRIDGE BOARD BANKS 4 - 7 RAM ICS = 41256 (256K X 1)
U27 U26 U25
BIT
BIT
1
BIT
2
U24 U23 U22 U21 U20
BIT
3
BIT
4
BIT
5
BIT
6
BIT
7
1ST
X'
2ND
Page 26
Page 34
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
PC10-I / PC10-II MEMORY LOCATION FAILURE CHART
O = PASS (OK) F = FAIL
Page 27
Page 35
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
PC10-III / PC20-III / PC COLT MEMORY LOCATION FAILURE CHART
V
A
L
U
E
O
F
1ST
[X]
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
B
A
N
K PC
S
0,1,2,3
4,5,6,7 313
8
9
PCB LOCATIONS
PC10/20-III
-U-
305 306 307 308
322 322 322 322
324 324 324 324
O O O O
O
0 0
0 0 F F
0
0 F
0 F F O
0 F F
F 0 0
F
F O
F O
F F
F
F
F F F F
MAIN
COLT
-U- -U- -U-
314 315 316
0 0 F
F 0 F
F F O
PCB
0 O F
F 0
F 0 O
0 F 5
F O
F F
0 O
B
V
A N
L
U S
E
O
F
2ND 4,5,6,7 317 318 319 320
[X]
0 O O O O
1
2
3 O
4 O
6
F
O
7 O F F F
8 F
9
A
B F
C
D
E
F
A
K
0,1,2,3
8 321
9 323
PCB LOCATIONS
MAIN PCB
PC10/20-III
COLT
PC
-u-
-U-
309
O
O
O
O F F O
F O O F
F O F O
F F O O
F F O F
F F F O
F F F F
-U- -U-
310 311 312
321
321
323 323
323
O O F
O F O
O F F
F O O
O
F
O O O
O F F
321
F
O = PASS (OK) F = FAIL
Page 28
Page 36
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
A2000 PC MODE MEMORY LOCATION FAILURE CHART
O = PASS (OK) F = FAIL
Page 29
Page 37
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
PC10-I / PC10-II MEMORY BIT FAILURE CHART
MAIN PCB BANKS 0 - 3 RAM ICs = 41256 (256K X 1)
U22 U23
BIT
0
BIT
1
U24 U25 U26 U27 U28
BIT
2
BIT
3
BIT
4
BIT
5
BIT
6
U29 U30
BIT
BIT
7
Parity
RAM EXPANSION PCB BANKS 4 - 7 RAM ICs = 41256 (256K X 1)
U1 U2
BIT
BIT
0
U3
BIT
1
2
U4
BIT
3
RAM EXPANSION PCB BANKS 8 - 9
INSTALLED IN 640K SYSTEM ONLY
U9 U10
Ull U12 U13 U14 U15
U5
BIT
4
RAM ICS = 41464 (64K X 4)
U6
BIT
5
U7
BIT
6
U8
BIT
7
_____
P
BIT
P
Parity
BANKS
4-7
EXAMPLE ERROR CODE
BIT
0-3
BIT
4-7
BANK
8
FAILURE
RANGE
FAILURE CODE OOFO 0000
—
30000-3FFFF
U27 ON MAIN
FAILURE RANGE 80000-8FFFF
FAILURE CODE
FOOO OOFF — BITS 0,1,7
=
U12,U13 ON EXPANSION PCB
Page 30
BIT
0-3
BIT
4-7
BANK
9
— BANK 3
— BIT
PCB
— BANK 8
5
Page 38
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
PC10-III / PC20-III / PC COLT MEMORY BIT FAILURE CHART
MAIN PCB BANKS 0 - 3 RAM ICS = 41256 (256K X 1)
U305 U306
BIT
0
BIT BIT BIT BIT BIT BIT BIT
1
U307 U308
2 3
U309 U310 U311 U312
4
5
6 7
MAIN PCB BANKS 4 - 7 RAM ICS = 41256 (256K X 1)
U313 U314 U315 U316 U317 U318 U319 U320
BIT BIT BIT BIT BIT BIT BIT BIT
0 1 2 3
4
5 6
7
MAIN PCB BANKS 8 - 9 RAM ICS = 41464 (64K X 4)
U322 U321 U324 U323
BIT
0-3
BIT
4-7
BIT
0-3
BIT
4-7
EXAMPLE ERROR CODE =
BANK
8
FAILURE RANGE
FAILURE CODE
FAILURE RANGE
FAILURE CODE
Page 31
BANK
9
50000-5FFFF — BANK 5
OOOO FOOO — BIT 3
U316 ON MAIN PCB
90000-9FFFF — BANK 9
OFFO OFOO — BITS 2,5,6
U324,U323 ON MAIN PCB
Page 39
COMMODORE PC10 DIAGNOSTICS
OPERATION INSTRUCTIONS
A2000 PC
A2088 BRIDGE BOARD
U19 U18 U17 U16
BIT
0
BIT
1
MODE
BANKS 0 - 3
BIT
2
BIT
3
MEMORY
BIT FAILURE CHART
RAM ICS = 41256 (256K X 1)
U15 U14 U13 U12
BIT
4
BIT
5
BIT
6
BIT
7
A2088 BRIDGE BOARD BANKS 4 - 7 RAM ICS = 41256 (256K X 1)
U27 U26 U25 U2 4 U23 U22 U21 U20
BIT
0
BIT
1
BIT
2
BIT
3
BIT
4
BIT
5
BIT
6
BIT
7
EXAMPLE ERROR CODE = FAILURE RANGE = 20000-2FFFF - BANK 2
FAILURE CODE = OFOO OOOO - BIT 6
U13 ON MAIN PCB
FAILURE RANGE = 70000-7FFFF - BANK 9
FAILURE CODE = OOFF OOFO - BITS 1,4,5
U26,U23,U22 ON MAIN PCB
Page 32
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Page 41
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