Siemens Nixdorf D756 User manual

PC
System board
PCD-H, PCD-4LSX
Technical Manual
Published by
Siemens Nixdorf Informationssysteme AG
Postfach 2160, W-4790 Paderborn
Postfach 830951, W-8000 München 83
Order No.: A26361-D756-Z120-1-7619
Printed in the Federal Republic of Germany
AG 0593 05/93
A26361-D756-Z120-1-7619

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Introduction
Important notes
Setup menu
System board
PCD-H, PCD-4LSX Settings and
add-on modules
Interface assignment
Error messages
Technical Manual
Index
May 1993 edition
Would you like to know more ...
... about this product
... or about another aspect of information technology?
Our Training Centers will be glad to help.
Siemens Nixdorf has Training Centers at strategic
locations in Germany and more than 20 countries worldwide.
Please write to:
Siemens Nixdorf
Area Training Management Europe North
125-135 Staines Road, Hounslow, Middlesex, TW3 3JB
United Kingdom
or call
Ron Johnson, Hounslow
Tel.: .[phone]
Fax.: .[phone]
Intel is a registered trademark, 80486SX, 80487SX, 80486DX, 80486DX2 and
OverDrive are trademarks of Intel Corporation, USA.
Microsoft, MS and MS-DOS are registered trademarks and Windows is a trademark of
Microsoft Corporation.
UNIX is a registered trademark of UNIX System Laboratories.
Copyright Siemens Nixdorf Informationssysteme AG 1993
The reproduction, transmission or use of this documents or contents is not permitted without
express written authority.
All rights, including rights created by patent grant or registration of a utility model or design,
are reserved.
Offenders will be liable for damages.
Right of technical modifications reserved.

Contents
Introduction 1
Explanation of symbols 1
Features 2
Important notes 5
Notes on software 6
Setup menu 7
Settings in the SETUP menu 8
Entries on the first page of the SETUP menu 8
Entries on the second screen page of the SETUP menu 11
Settings and add-on modules 17
Lithium battery on the system board 17
Primary CRT controller 18
Mouse interface and interrupt 12 (IRQ12) 18
ERGO VGA III controller 18
Processor type and processor speed 19
Upgrading 20
Main memory 21
Memory modules 21
Installing a memory module 22
Removing a memory module 23
Second level cache memory 24
Upgrading 25
Table of hard disks 26
Interface assignment 27
Connector for power supply J1 27
Connector for external loudspeaker J13 27
Connector for lithium battery J14 28
Connector for indicator JP30 28
Connector J23 for external monitor controller 29
Error messages 31
Index 33
A26361-D756-Z120-1-7619

Introduction
This description applies for the system boards with the processors 80486SX,
80486DX and 80486DX2.
Explanation of symbols
The meanings of the symbols and fonts used in this manual are as follows:
!Pay particular attention to texts marked with this symbol. Failure to observe
this warning endangers your life, destroys the system, or may lead to loss of
data.
This symbol is followed by supplementary information, remarks and tips.
i
Texts which follow this symbol describe activities that must be performed in the
order shown.
This symbol means that you must enter a blank space at this point.
↵ This symbol means that you must press the Enter key.
Texts in this typeface are screen outputs from the PC.
Texts in this bold typeface are the entries you make via the keyboard.
Texts in italics indicate commands or menu items.
"Quotation marks" indicate highlighted text and names of chapters.
A26361-D756-Z120-1-7619 1
Introduction
Features
80486SX
– 32-bit microprocessor 80486SX/25 MHz or 33 MHz with 8 Kbyte internal cache
memory (first level cache)
80486DX
– 32-bit microprocessor 80486DX/25 MHz or 33 MHz with integrated coprocessor
and 8 Kbyte internal cache memory (first level cache)
80486DX2
– 32-bit microprocessor 80486DX2/50 MHz or 66 MHz with integrated coprocessor
and 8 Kbyte internal cache memory (first level cache)
Common features
– Socket for Upgrade with 80487SX/25 MHz/33 MHz or ODP486/25 MHz/33 MHz
– Socket for 80486SX/33 MHz, 80486DX/25 MHz/33 MHz,
80486DX2/50 MHz/66 MHz or ODPR486/25 MHz/33 MHz
– Memory configuration: 4 Mbyte to 32 Mbyte RAM onboard
– Second level cache memory on the system board: 0 Kbyte, 64 Kbyte or
256 Kbyte
– Video memory on the system board: 1 Mbyte
– 114 Byte Setup memory in CMOS RAM
– 8-bit EPROM (128 Kbyte * 8)
– Real-time clock/calendar with integrated battery backup
– Loudspeaker
– Floppy disk drive controller (up to 1.4 Mbyte format)
– ERGO VGA III controller
– Bus interface
– Connector for IDE hard disk drive
– Connector for floppy disk drive
– Connector for external monitor controller
– Connector for external loudspeaker
– Parallel interface
– 2 serial interfaces
– Mouse interface
– Keyboard port
– Monitor interface
2A26361-D756-Z120-1-7619

Introduction
12345678910 11 12 13
14
15
16
17
18
19
20
21
22
23
1 = Monitor interface 14 = Socket U1 for 80486SX, 80486DX,
2 = Parallel interface 80486DX2 or ODPR486
3 = EPROM with BIOS 15 = Solder location U3 for 80486SX
4 = Serial interface (Ser 2) 16 = Socket U2 for 80487SX or ODP486
5 = Serial interface (Ser 1) 17 = Connector for external loudspeaker
6 = Mouse interface 18 = Connector for indicator
7 = Keyboard port 19 = Memory bank 0 (J2 bis J5)
8 = Lithium battery 20 = Memory bank 1 (J6 bis J9)
9 = Connector for lithium battery 21 = Video memory
10 = Connector for power supply 22 = Connector for external
11 = Connector for floppy disk drive monitor controller
12 = Connector for IDE hard disk drive 23 = Bus interface
13 = Slots U48 - U58 for
second level cache memory
A26361-D756-Z120-1-7619 3
Introduction
Possible screen resolution
Screen Refresh Horizontal- Max. number
resolution rate (Hz) rate (kHz) of colours
640x350 70 31,5 16
640x350 *) 83 39,4 16
640x350 84 37,8 16
640x480 60 31,5 16777160
640x480 72 37,9 65536
640x480 *) 72 39,4 65536
720x400 70 31,5 16
720x400 *) 83 39,4 16
720x400 84 37,8 16
800x600 56 35,2 65536
800x600 60 37,9 65536
800x600 72 48,1 256
800x600 75 49,5 256
1024x768 43,5 (interl.) 35,5 256
1024x768 60 48,3 256
1024x768 70 56 256
1024x768 75 60,2 256
1280x1024 43,5 (interl.) 48 16
*) = overscan
4A26361-D756-Z120-1-7619

Important notes
!Please note the information provided in the chapter "Safety" in the
Operating Manual of the PC.
The lithium battery on the board may only be replaced by specialist
technicians. There is a danger of explosion if this is not done properly.
The lithium battery must be replaced with an identical battery or a battery
type recommended by the manufacturer.
The lithium battery must be disposed of in accordance with local regulations
on the disposal of special refuse.
Be sure to read this page carefully and note the information before you
open the PC.
Modules with ESDs (electrostatic sensitive devices) may be identified by labels.
When you handle modules fitted with ESDs, you must observe the following points
under all circumstances:
– When you handle modules fitted with ESDs, you must always discharge yourself
(e.g. by touching a grounded object) before working.
– The equipment and tools you use must be free of static charges.
– Pull out the power plug before inserting or pulling out modules containing ESDs.
– Always hold modules with ESDs by their edges.
– Never touch pins or conductors on modules fitted with ESDs.
A26361-D756-Z120-1-7619 5
Important notes
Notes on software
Program with time loops
Problems can occur with programs in which time loops have been implemented
through software loops. This applies in particular to older programs which were
written for 8 MHz processors.
SCO-UNIX on devices with 80486DX2/50 MHz/66 MHz processor
If you upgrade the system board by adding an 80486DX2/50 MHz or
80486DX2/66 MHz upgrade processor, please note the following:
If you use the 80486DX2/50 MHz or 80486DX2/66 MHz processors, the Adaptec-
SCSI controller cannot be addressed under SCO-UNIX 3.2.4 and ODT 2.0.
To solve this problem, you can order from SCO a set of SLS (Support Level
Supplement) floppies (consisting of 3 floppy disks) under the number uod361, free
of charge, or contact SNI's spare parts service.
The problem no longer exists in the new releases of SCO-UNIX 3.2.4.2 and
ODT 2.1.
There will be no support for older versions (SCO-UNIX versions lower than 3.2.4
and ODT versions lower than 2.0).
6A26361-D756-Z120-1-7619

Setup menu
CMOS Setup
System Configuration
---------------------------------------------------------------------------
Time (hh:mm:ss) 08:38:27 Date (mm/dd/yyyy) 02/17/1993
Diskette A: 1.4M
Diskette B: NONE
Cyl Hd Pre LZ Sec Mbyte
Hard Disk 1: 48 762 8 NONE NONE 39 120
Hard Disk 2: NONE
Base Memory: 640K Video Display: EGA/VGA
Extended Memory: 3072K Math Coprocessor: NO
Speed Select: HIGH
ERROR HALT: HALT ON ALL ERRORS
---------------------------------------------------------------------------
<F1> Help <F8> System info <F10> Store CMOS <Esc> Exit Page
<...> Edit field <↑↓←→> Next field <PgUp> Next page <Ctrl> ... 01
Example of the first screen page of a SETUP menu
CMOS Setup
Additional System Options
---------------------------------------------------------------------------
Time (hh:mm:ss) 08:38:27 Date (mm/dd/yyyy) 02/17/1993
System Load: STANDARD
Security Features: DISABLED
Shadow BIOS ROM: SYSTEM AND VIDEO BIOS
Cache: WRITE BACK
Cache Shadow RAM: VIDEO BIOS ONLY
Serial 1: COM1 (3F8h) Diskette Write: ENABLED
Serial 2: COM2 (2F8h) Diskette Ctrlr: ENABLED
Parallel: LPT1 (378h) Hard Disk Ctrlr: ENABLED
Par Mode: PRINTER HD Ctrl Mode: STANDARD
---------------------------------------------------------------------------
<F1> Help <F8> System info <F10> Store CMOS <Esc> Exit Page
<...> Edit field <↑↓←→> Next field <PgUp> Next page <Ctrl> ... 02
Example of the second screen page of a SETUP menu
A26361-D756-Z120-1-7619 7
Setup menu
Settings in the SETUP menu
Settings and technical information about the configuration of your PC are displayed
in the SETUP menu. How to call the SETUP menu and how to change the entries
is described in the Operating Manual of the PC. A help text can be obtained for
every input field by pressing the F1 function key.
The SETUP menu consists of the following screen pages:
System Configuration, Additional System Options and System Information.
Entries on the first page of the SETUP menu
Time
Date The field Time defines the time of the PC, the field Date defines the date of
the PC. When changinging the entries use for Time the enty format hh:mm:ss
(hours:minutes:seconds) and for Date the entry format mm/dd/yy
(month/day/year).
!If the fields DATE and TIME are frequently wrong after you switch off
and on again, the battery is dead. Please apply in this case to the
customer field service.
Diskette A
Diskette B
These two fields are used to specify what type of drive is installed.
The possible settings are 360K, 1.2M, 720K, 1.4M, 2.8M und NONE.
Default entry for Diskette A:
3 1/2-inch floppy disk drive 1.4M
5 1/4-inch floppy disk drive 1.2M
Default entry for Diskette B:NONE
8A26361-D756-Z120-1-7619

Setup menu
Hard Disk 1
Hard Disk 2
These two fields are used to indicate what type of hard disk is installed (see
also chapter "Settings and add-on modules")
Possible entries are 1to 49 and NONE.
If the wrong hard disk type is entered, the system cannot be loaded.
iThe entries for hard disk types 48 and 49 (cylinders, head etc.) must be
keyed in via the keyboard.
Special entries for the hard disk type:
Default for SCSI hard disk drives: NONE
Default for ESDI hard disk drives: 1
Default entry for HARD DISK 1: depends on hard disk installed
Default entry for HARD DISK 2: NONE
Base Memory
This field indicates the amount of main memory available below 1 Mbyte.
Extended Memory
The field Extended Memory indicates the memory area whose address space
starts at 1 Mbyte.
Video Display
The type of monitor connected is entered in this field. Possible entries are
EGA/VGA, COLOR 40, COLOR 80, MONO.
Default entry: EGA/VGA
Math Coprocessor
In this field the system enters whether a coprocessor is installed.
A26361-D756-Z120-1-7619 9
Setup menu
Speed Select
This entry allows you to define the system speed after system startup.
Possible entries are HIGH (e.g. 33 MHz with the 80486DX/33 MHz) or LOW
(8 MHz).
Default entry: HIGH
Error Halt
This entry defines whether command execution is to be interrupted if an error
is detected during the self-test. Available options are:
HALT ON ALL ERRORS
This means that command execution is interrupted each time an error is
detected during the self-test.
NO HALT ON ANY ERRORS
Command execution is not interrupted.
NO KEYBOARD ERROR HALT
Command execution is not interrupted in the event of a keyboard error.
NO DISK ERROR HALT
Command execution is not interrupted in the event of floppy or hard disk
errors.
NO KEYBOARD OR DISK HALT
Command execution is not interrupted in the event of keyboard, floppy
disk or hard disk errors.
The default setting should only be changed in special applications.
i
Default entry: HALT ON ALL ERRORS
10 A26361-D756-Z120-1-7619

Setup menu
Entries on the second screen page of the SETUP menu
Time
Date The second screen page of the SETUP menu displays also the time and the
date of your PC.
System Load
This entry enables you to inhibit loading of the operating system from floppy
disk. The following options are available:
STANDARD
The operating system is loaded from floppy disk and from the hard disk.
DISKETTE LOCK
The operating system can only be loaded from the hard disk.
Default entry: STANDARD
Security Features
This field allows you to define a password to prevent access to the data in
your PC. The following options are available:
DISABLED
No passwords are in effect.
SYSTEM AND Setup LOCK
The SETUP menu and operating system are protected by passwords.
Setup LOCK
The SETUP menu is protected by a password.
KEYBOARD AND Setup LOCK
The SETUP menu is protected and the keyboard and the mouse are
locked by passwords.
CHANGE PASSWORD
This option is displayed only if a password has already been defined. It
enables you to alter the password.
Default entry: DISABLED
A26361-D756-Z120-1-7619 11
Setup menu
Shadow BIOS ROM
Part of the operating system (System BIOS) is resident in an EPROM. How
fast this part of the program runs is determined by the fairly slow EPROMs.
The entry in this field enables you to copy the BIOS to the fast RAM after
powering up. This shortens the runtimes of these program sections and
enhances PC performance (speed).In the same way you can copy the
Video BIOS to the RAM.
Memory areas for the SHADOW BIOS ROM:
Function Memory area used
SYSTEM BIOS ONLY F0000H - FFFFFH
SYSTEM AND VIDEO BIOS C0000H - C7FFFH/F0000H - FFFFFH
VIDEO BIOS ONLY C0000H - C7FFFH
The following entries are possible:
SYSTEM AND VIDEO BIOS
System BIOS and Video BIOS are copied.
SYSTEM BIOS ONLY
System BIOS is copied.
VIDEO BIOS ONLY
Video BIOS is copied.
Default entry: SYSTEM AND VIDEO BIOS
Cache
If a processor with an internal cache memory is plugged into the system
board, the cache input field and the cache memory function are available.
In the input field, you can determine whether a part of the main memory is
mapped in the high-speed cache memory (SRAM). Program runs and data
accesses can be executed much more quickly in this way.
12 A26361-D756-Z120-1-7619

Setup menu
The following entries are possible:
WRITE BACK
The function is switched on (quicker access to the cache memory than
with WRITE THROUGH).
WRITE THROUGH
The function is switched on.
DISABLED
The function is disabled.
Neither the first level cache memory (in the processor) nor the second
level cache memory (inserted) can be used.
If the access time is too short for application programs, you must
idisable the function.
Default entry: WRITE BACK
Cache Shadow RAM
Condition:
In the cache field, WRITE BACK or WRITE THROUGH must be set and the
selected memory segments must be copied to the RAM with the Shadow BIOS
ROM function!
With this input field, you can select ROM segments which will be mapped in
the cache memory in addition to the main memory segments.
The following entries are possible:
SYSTEM BIOS ONLY
System BIOS is mapped in the cache memory.
VIDEO BIOS ONLY
Video BIOS is mapped in the cache memory.
SYSTEM AND VIDEO BIOS
System BIOS and video BIOS are mapped in the cache memory.
DISABLED
The function is disabled.
Default entry: VIDEO BIOS ONLY
A26361-D756-Z120-1-7619 13
Setup menu
Serial 1
The serial interface SER1 can be set here.
Possible settings: COM1 (3F8h),COM3 (3E8h),DISABLED.
COM1 (3F8h)
The serial interface SER1 is set to addresses 3F8h and IRQ4.
COM3 (3E8h)
The serial interface SER1 is set to addresses 3E8h and IRQ4.
DISABLED
The serial interface SER1 is off.
Default entry: COM1 (3F8h)
Serial 2
The serial interface SER2 can be set here.
Possible settings:
COM2 (2F8h)
The serial interface SER2 is set to address 2F8h and IRQ3.
COM4 (2E8h)
The serial interface SER2 is set to address 2E8h and IRQ3.
DISABLED
The serial interface SER2 is off.
Default entry: COM2 (2F8h)
14 A26361-D756-Z120-1-7619

Setup menu
Parallel
The parallel interface PAR can be set here.
Possible settings:
LPT1 (378h)
The parallel interface PAR is set to address 378h and IRQ7.
LPT3 (3BCh)
The parallel interface PAR is set to address 3BCh and IRQ7.
DISABLED
The parallel interface PAR is off.
Default entry: LPT1 (378h)
Par Mode
You can define here whether the parallel interface PAR can only send, or
both send and receive.
Possible settings:
PRINTER
The parallel interface PAR can only send.
BIDIRECTION
Additional software enables the parallel interface PAR to send and
receive.
Default entry: PRINTER
Diskette Write
This field allows you to define whether floppy disks can be written and
deleted. Possible entries:
ENABLED
Floppy disks can be read, written or deleted.
DISABLED
Floppy disks can be read only.
Default entry: ENABLED
A26361-D756-Z120-1-7619 15
Setup menu
Diskette CTRLR
This field allows you to disable the diskette controller on the system board.
Possible entries:
ENABLED
The diskette controller on the system board is on.
DISABLED
The diskette controller on the system board is off.
Default entry: ENABLED
Hard Disk CTRLR
This field allows you to disable the hard disk controller on the system board.
Possible entries:
ENABLED
The IDE hard disk controller on the system board is on.
DISABLED
The IDE hard disk controller on the system board is off.
Default entry: ENABLED
HD Ctrl Mode
With this input field, you can set the transmission speed of the IDE hard disk.
If the integral IDE hard disk drive does not support this function, select the
STANDARD entry.
Possible entries:
STANDARD
Normal transmission speed.
IDE HIGH SPEED
High transmission speed.
This setting is supported by most hard disks with a disk buffer of four
KBytes or more.
Default entry: STANDARD
16 A26361-D756-Z120-1-7619

Settings and add-on modules
123
4
5
6
7
1 = U-plug JP11 for mouse port 5 = U-plugs JP1 - JP3 for
2 = U-plug JP10 for primary Processor type
CRT controller 6 = U-plugs JP5 and JP6 for
3 = U-plug JP8 for lithium battery system speed
4 = U-plug JP12 - JP17 for 7 = U-plug JP25 for
second level cache memory ERGO VGA III controller
Lithium battery on the system board
You can disable the lithium battery on the system board with the JP8 U-plug. If the
lithium battery is disabled, the data in the CMOS RAM is deleted.
Lithium battery enabled = U-plug JP8 set to 1-2
Lithium battery disabled = U-plug JP8 set to 2-3
Default setting:
U-plug JP8 set to 1-2 = Lithium battery enabled
A26361-D756-Z120-1-7619 17
Settings and add-on modules
Primary CRT controller
If there are two integral screen controllers, set the primary screen controller with
the JP10 U-plug.
Monochrome CRT controller = U-plug JP10 not inserted
Color CRT controller = U-plug JP10 inserted
Default setting:
U-plug JP10 inserted = Color CRT controller
Mouse interface and interrupt 12 (IRQ12)
You can switch the mouse interface on or off with the JP10 U-plug. If the mouse
interface is switched on, interrupt 12 (IRQ12) is used for the mouse.
Mouse interface and IRQ12 enabled = U-plug JP11 inserted
Mouse interface and IRQ12 disabled = U-plug JP11 not inserted
Default setting:
U-plug JP11 inserted = mouse interface and IRQ12 enabled
ERGO VGA III controller
You can enable or disable the ERGO VGA III controller on the system board with
the JP25 U-plug.
ERGO VGA III controller enabled = U-plug JP25 inserted
ERGO VGA III controller disabled = U-plug JP25 not inserted
Default setting:
U-plug JP25 inserted = ERGO VGA III controller enabled
18 A26361-D756-Z120-1-7619

Settings and add-on modules
Processor type and processor speed
There are three sockets on the system board for the processor:
– U1 - the processor is inserted
– U2 - the processor is inserted (upgrade)
– U3 - the processor is soldered onto the board
Depending on the processor type used, the U-plugs JP1 to JP3 are inserted
differently. Depending on the processor speed, the U-plugs JP5 and JP6 are
inserted differently.
Processor type / U-plug assignment of
speed JP1 JP2 JP3 JP5 JP6
80486SX/ 25 (U3) 1-2 2-3 inserted inserted ---
80486SX/ 33 (U3) 1-2 2-3 inserted --- inserted
80486SX/ 33 (U1) --- 1-2 --- --- inserted
80486DX/ 33 (U1) 1-2 2-3 inserted --- inserted
80486DX2/ 50 (U1) 1-2 2-3 inserted inserted ---
80486DX2/ 66 (U1) 1-2 2-3 inserted --- inserted
--- = not inserted
A26361-D756-Z120-1-7619 19
Settings and add-on modules
Upgrading
You can upgrade the system board by simply plugging in the processor.
!Note the mounting location of the chip when you plug in the new processor!
If you upgrade a 33 MHz processor with a coprocessor or OverDrive
processor for 25 MHz, you must pull the JP6 U-plug and insert the JP5 U-
plug.
U2
12
1 = Mark on socket
2 = Mark on the top of the processor
Insert the new processor in such a way that the mark on the processor matches
the mark on the socket.
Upgrading a 80486SX/25
Insert the 80487SX-25 coprocessor or the OPD486-25 OverDrive processor in
the U2 socket.
Upgrading a 80486SX/33
Plug the OverDrive processor OPD486-33 into the upgrade socket U2.
Upgrading a 80486DX/33
Plug the OverDrive processor OPD486-33 into the upgrade socket U2.
For other upgrade options, please contact our customer service.
20 A26361-D756-Z120-1-7619

Settings and add-on modules
Main memory
8 locations (J2 to J5 = Bank 0; J6 bis J9 = Bank 1) are available on the system
board for connecting memory modules.
!Only the upgrade levels and slots listed in the table are permissible for the
memory configuration.
Memory configuration memory modules slots
4 Mbyte 4 of 1 Mbyte each Bank 0
8 Mbyte 8 of 1 Mbyte each Bank 0 and Bank 1
16 Mbyte 4 of 4 Mbyte each Bank 0
20 Mbyte 4 of 1 Mbyte each Bank 0
4 of 4 Mbyte each Bank 1
32 Mbyte 8 of 4 Mbyte each Bank 0 and Bank 1
Memory modules
!You may only use quick memory modules (Access time = 70 nsec or less)!
Memory module with 1 Mbyte
A26361-D756-Z120-1-7619 21
Settings and add-on modules
Memory modules with 4 Mbyte
Installing a memory module
!You may not insert different memory modules in one bank.
When using only 4 memory modules they must be inserted in bank 0 (J2 to
J5).
Install the memory module in such a way that the components side faces
the inside of the system unit.
1
2
Plug the module into its slot at a slanting angle (1).
Tilt the module back until it snaps into place (2).
22 A26361-D756-Z120-1-7619

Settings and add-on modules
Removing a memory module
32
1
1
Force the plastic holders carefully outward at left and right (1).
Tilt the module forward (2) and pull the module off upward (3).
A26361-D756-Z120-1-7619 23
Settings and add-on modules
Second level cache memory
The second level cache memory can be 0 Kbytes, 64 Kbytes, 128 Kbytes or
256 Kbytes in size. There are 11 sockets on the system board (U48 to U58) for
incorporating the SRAM components.
!Information on which SRAM components you can use is available from your
sales office or the customer service.
Only the SRAM components and sockets listed in the table below are
permissible for the configuration of the second level cache memory.
Slot Memory configuration
64 Kbyte 128 Kbyte 256 Kbyte
U48 8Kbit*8 15 ns 8Kbit*8 15 ns 8Kbit*8 15 ns
U49 --- --- --- --- 8Kbit*8 15 ns
U50 16Kbit*4 15 ns 16Kbit*4 15 ns 16Kbit*4 15 ns
U51 - U54 8Kbit*8 20 ns 32Kbit*8 20 ns 32Kbit*8 20 ns
U55 - U58 8Kbit*8 20 ns --- --- 32Kbit*8 20 ns
--- = not inserted
Depending on the configuration of the second level cache memory, the U-plugs
JP12 to JP17 are inserted differently.
Memory U-plug setting of
configuration JP12 JP13 JP14 JP15 JP16 JP17
0 Kbyte 2-3 2-3 --- --- --- ---
64 Kbyte 2-3 2-3 --- --- --- ---
128 Kbyte 1-2 1-2 inserted --- --- inserted
256 Kbyte 2-3 2-3 inserted inserted inserted inserted
--- = not inserted
24 A26361-D756-Z120-1-7619

Settings and add-on modules
You should set the following in the SETUP menu in order to be able to use the
second level cache memory completely:
– Speed Select: HIGH
– Shadow BIOS ROM: SYSTEM AND VIDEO BIOS
– Cache: WRITE BACK
– Cache Shadow RAM: VIDEO BIOS ONLY
Upgrading
!Note the location of the SRAM chip when you plug in SRAM chip!
12
1 = Mark on socket
2 = Mark on the top of the SRAM component
Insert the SRAM component in such a way that the mark on the SRAM
component matches the position of the mark on the socket.
Set the U-plugs JP12 to JP17 in accordance with the memory configuration.
Set the recommended entries in the SETUP menu.
A26361-D756-Z120-1-7619 25
Settings and add-on modules
Table of hard disks
This table lists the different types of hard disk.
Type Tracks Heads Mbyte Type Tracks Heads Mbyte
1 306 4 10 26 1024 4 34
2 615 4 20 27 1024 5 42
3 615 6 30 28 1024 8 68
4 940 8 62 29 512 8 34
5 940 6 46 30 615 2 10
6 615 4 20 31 989 5 41
7 462 8 30 32 1020 15 127
8 733 5 30 33 0 0 0
9 900 15 112 34 0 0 0
10 820 3 20 35 1024 9 76
11 855 5 35 36 1024 5 42
12 855 7 49 37 830 10 68
13 306 8 20 38 823 10 68
14 733 7 42 39 615 4 20
15 0 0 0 40 615 8 40
16 612 4 20 41 917 15 114
17 977 5 40 42 1023 15 127
18 977 7 56 43 823 10 68
19 1024 7 59 44 820 6 40
20 733 5 30 45 1024 8 68
21 733 7 42 46 925 9 69
22 733 5 30 47 699 7 40
23 306 4 10 48 manual entries
24 830 10 105 49 manual entries
25 615 4 20
Special entries:
iDefault for SCSI hard disk drive: NONE
Default for ESDI hard disk drive: 1
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Interface assignment
The assignment of the standard interfaces is described in the technical manual of
the PC (section "Technical data").
Connector for power supply J1
1
12
Pin Meaning
1 Power Good
2 +5 V
3 +12 V
4 -12 V
5 - 8 0 V
9 -5 V
10 - 12 +5 V
Connector for external loudspeaker J13
14
Pin Meaning
1 external loudspeaker
2 internal loudspeaker
3 0 V
4 +5 V
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Interface assignment
Connector for lithium battery J14
12
Pin Meaning
1 0 V
2 +
Connector for indicator JP30
12
12
Pin Signal name
1 System unit ON
2 0 V
3 Turbo
4 0 V
5 coded
6 coded
7 Turbo switch
8 0 V
9 Reset switch
10 0 V
11 +5 V
12 Hard disk drive
28 A26361-D756-Z120-1-7619

Interface assignment
Connector J23 for external monitor controller
21
25
Pin Meaning Pin Meaning
1 0 V 14 Data 6
2 Data 0 15 0 V
3 0 V 16 Data 7
4 Data 1 17 0 V
5 0 V 18 Clock
6 Data 2 19 0 V
7 Select Video 20 Blanking
8 Data 3 21 0 V
9 Select Synchronization 22 Horizontal Sync.
10 Data 4 23 free
11 Select DAC 24 Vertical Sync.
12 Data 5 25 coded
13 free 26 0 V
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Error messages
This chapter contains the error messages generated by the system board.
Access Denied - System Halted
You have entered an illegal password 3 times. Restart the PC.
Access to Setup Denied - Press Any Key to Continue
You have entered an illegal password 3 times. Press any key.
CMOS RAM ERROR, CHECK BATTERY/RUN Setup
Check all the entries in the setup menu. If this error occurs each time the PC
is powered up, contact your customer field service.
DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER
Insert the operating system floppy disk in the drive and press the Enter key.
Check the entries for the floppy and hard disk types in the setup menu.
DISKETTE DRIVES OR TYPES MISMATCH ERROR - RUN Setup
Check the drive type entered in the Diskette field of the setup menu and also
the connections for the floppy disk drive.
ERROR ENCOUNTERED INITIALIZING HARD DRIVE
Check the hard disk type entered in the Hard Disk 1 and Hard Disk 2 fields of
the setup menu and also the connections and U-plugs on the hard disk drive.
ERROR INITIALIZING HARD DISK CONTROLLER
Contact your customer field service.
FLOPPY DISK CNTRLR ERROR OR NO CNTRLR PRESENT
Check the entry in the Diskette field of the setup menu and also the
connections and U-plugs on the floppy disk drive.
Incorrect Password
You have entered an illegal password. Enter the password again and press
the Enter key.
IO PARITY ERROR - SYSTEM HALTED
Restart your PC. Should the error recur, contact your customer field service.
KEYBOARD ERROR OR NO KEYBOARD PRESENT
Check whether a key is sticking and whether the keyboard is connected
correctly.
MATH COPROCESSOR ADDED/REMOVED - RUN Setup
Call up the setup menu and confirm with the F10 and F5 keys the entry in
the COPROCESSOR INSTALLED field.
A26361-D756-Z120-1-7619 31
Error messages
MEMORY PARITY ERROR AT AA:SSSS:OOOO FOUND FFFF EXPECTED EEEE
Restart your PC.
MEMORY SIZE ERROR - RUN Setup
Call up the setup menu and confirm with the F10 and F5 keys the entries in
the Base Memory and Extended Memory fields.
MEMORY VERIFY ERROR AT AA:SSSS:OOOO FOUND FFFF EXPECTED EEEE
Restart your PC.
Passwords entered do Not Match
You have confirmed an illegal password. Enter the password again and
press the Enter key.
RAM PARITY ERROR. CHECKING FOR SEGMENT ADDRESS ...
OFFENDING SEGMENT: SSSS
Restart your PC.
RAM PARITY ERROR. CHECKING FOR SEGMENT ADDRESS ...
OFFENDING ADDRESS NOT FOUND
Restart your PC.
REAL TIME CLOCK ERROR - RUN Setup
Call up the setup menu and enter the correct time in the Time field.
REFRESH TIMING ERROR
Contact your customer field service.
Security Features Not Changed - Press Any ey to Continue
You have confirmed an illegal password 3 times. No password is assigned.
Press any key.
VIDEO EQUIPMENT CONFIGURATION ERROR - RUN Setup
The entry in the Video Display field of the setup menu is incorrect. Correct the
entry or the U-plug for the primary monitor.
32 A26361-D756-Z120-1-7619