Acer M19A System User Manual

M19A SystemM19A System

User’s Guide

CopyrightCopyright

Copyright  1998 by this company. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of this company.

DisclaimerDisclaimer

This company makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties, merchantability or fitness for any particular purpose. Any software described in this manual is sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not this company, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential damages resulting from any defect in the software. Further, this company reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation to notify any person of such revision or changes.

All brand and product names mentioned in this manual are trademarks and/or registered trademarks of their respective companies.

IMPORTANT SAFETYIMPORTANT SAFETY

INSTRUCTIONSINSTRUCTIONS

1. Read these instructions carefully. Save these instructions for future reference.

2. Follow all warnings and instructions marked on the product.

3. Do not use this product near water.

4. Do not place this product on an unstable cart, stand, or table. The product may fall, causing serious damage to the product.

5. Slots and openings in the cabinet and the back or bottom are provided for ventilation; to ensure reliable operation of the product and to protect it from overheating, these openings must not be blocked or covered. The openings should never be blocked by placing the product on a bed, sofa, rug, or other similar surface. This product should never be placed near or over a radiator or heat register, or in a built-in installation unless proper ventilation is provided.

6. This product should be operated from the type of power indicated on the marking label. If you are not sure of the type of power available, consult your dealer or local power company.

7. This product is equipped with a 3-wire grounding-type plug, a plug having a third (grounding) pin. This plug will only fit into a grounding-type power outlet. This is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the purpose of the grounding-type plug.

8. Do not allow anything to rest on the power cord. Do not locate this product where persons will walk on the cord.

iii

9. If an extension cord is used with this product, make sure that the total ampere rating of the equipment plugged into the extension cord does not exceed the extension cord ampere rating. Also, make sure that the total rating of all products plugged into the wall outlet does not exceed 15 amperes.

10. Never push objects of any kind into this product through cabinet slots as they may touch dangerous voltage points or short out parts that could result in a fire or electric shock. Never spill liquid of any kind on the product.

11. Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous voltage points or other risks. Refer all servicing to qualified service personnel.

12. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions:

a. When the power cord or plug is damaged or frayed b. If liquid has been spilled into the product c. If the product has been exposed to rain or water d. If the product does not operate normally when the operating

instructions are followed. Adjust only those controls that are covered by the operating instructions since improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to normal condition.

e. If the product has been dropped or the cabinet has been

damaged

f. If the product exhibits a distinct change in performance,

indicating a need for service

13. Replace the battery with the same type as the product's battery we recommend. Use of another battery may present a risk of fire or explosion. Refer battery replacement to a qualified serviceman.

14. Warning! The battery could explode if not handled properly. Do not recharge, disassemble or dispose of it in fire. Keep it away from children and dispose of my used battery promptly.

15. Use only the proper type of power supply cord set (provided in your keyboard/manual accessories box) for this unit. It should be a detachable type: UL listed/CSA certified, type SVT/SJT, rated 6A 125V minimum, VDE approved or its equivalent. Maximum length is 15 feet (4.6 meters).

CD-ROM Safety WarningCD-ROM Safety Warning

DANGER

INVISIBLE RADIATION WHEN OPEN.

AVOID EXPOSURE TO BEAM.

VORSICHT

UNSICHTBARE LASERSTRAHLUNG WENN GEÖFFNET.

NICHT IN DEN STRAHL SEHEN.

ATTENTION

RADIATION DU FAISCEAU LASER INVISIBLE. EN CAS

D’OUVERTURE. EVITER TOUTE EXPOSITION AUX RAYONS.

VARO

AVATTAESSA OLET ALTTIINA NÄKYMÄTTÖMÄLLE

LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN.

VARNING!

OSYNLING LASERSTRÄLNING NÄR DENNA DEL ÄR ÖPPNAD.

BETRAKTA EJ STRÄLEN.

VARNING

OSYNLING LASERSTRÄLNING NÄR DENNA DEL ÄR ÖPPNAD.

STIRRA EJ IN I STRÄLEN.

ADVARSEL

LASERSTRÄLING VED ÄBNING. SE IKKE IND I STRÄLEN.

CLASS 1 LASER PRODUCT

APPAREIL A LASER DE CLASSE 1

LASER KLASSE 1

LOUKAN 1 LASERLAITE

PRODUIT LASER

CATEGORIE 1

Caution on Lithium BatteriesCaution on Lithium Batteries

CAUTION

Danger of explosion if battery is incorrectly replaced. Replace only

with the same or equivalent type recommended by the manufacturer.

Discard used batteries according to the manufacturer’s instructions.

ADVARSEL!

Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri af samme fabrikat og type.

Léver det brugte batteri tilbage til leverandøren.

ADVARSEL

Eksplosjonsfare ved feilaktig skifte av batteri. Benytt samme batteritype eller en tilsvarende

type anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens instruksjoner.

VARNING

Explosionsfara vid felaktigt batteribyte.

Anvãnd samma batterityp eller en ekvivalent typ som

rekommenderas av apparattillverkaren.

Kassera anvãnt batteri enligt fabrikantens instruktion.

VAROITUS

Päristo voi räjähtää, jos se on virheellisesti asennettu.

Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.

Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

VORSICHT!

Explosionsgefahr bei unsachgemäßen Austausch der Batterie Ersatz

nur durch denselben oder einem vom Hersteller empfohlenem

ähnlichen Typ. Entsorgung gebrauchter Batterien nach Angaben des

Herstellers.

vii

FCC Class B Radio Frequency InterferenceFCC Class B Radio Frequency Interference

StatementStatement

Note:

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

1. Reorient or relocate the receiving antenna.

2. Increase the separation between the equipment and receiver.

3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

4. Consult the dealer or an experienced radio/television technician for help.

Notice 1:

The changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Notice 2:

Shielded interface cables, if any, must be used in order to comply with the emission limits.

viii

About this ManualAbout this Manual

Purpose

This user’s guide aims to give you the information you need to operate the system properly and tells you how to install internal components.

Manual Structure

This user’s guide consists of two chapters.

Chapter 1 System Board

This chapter describes the system board and all its major components. It contains the system board layout, jumper settings, cache and memory configurations, and information on other internal devices.

Chapter 2 BIOS Utility

This chapter gives information about the system BIOS and tells how to configure the system by changing the settings of the BIOS parameters.

Chapter 3 SCSI/VGA Combo Card

This chapter gives information about the SCSI/VGA combo card and tells how to connect and configure the combo card to the system board.

Conventions

The following conventions are used in this manual:

Text entered by user Represents text input by the user.

, , , etc. Represent the actual keys that you

have to press on the keyboard.

NOTE

Gives bits and pieces of additional information related to the current topic.

CAUTION

Gives precautionary measures to avoid possible hardware or software problems.

IMPORTANT

Reminds you to take specific actions relevant to the accomplishment of procedures.

Table of ContentsTable of Contents

Chapter 1 System Board

1.1 Features .................................................................. 1-1

1.2 Major Components................................................... 1-3

1.3 Layout...................................................................... 1-4

1.4 Jumpers and Connectors.........................................1-5

1.4.1 Jumper and Connector Locations ..............1-5

1.4.2 Jumper Settings ........................................1-6

1.4.3 Connector Functions.................................. 1-7

1.5 ESD Precautions......................................................1-9

1.6 Installing the Pentium II processor .........................1-10

1.6.1 Attaching the Processor Heat Sink and

Fan..........................................................1-10

1.6.2 Installing a Pentium II Processor .............1-13

1.6.3 Removing a Pentium II Processor ...........1-15

1.7 Installing the Termination Board............................. 1-16

1.8 Memory Upgrade...................................................1-17

1.8.1 Memory Configurations ...........................1-17

1.8.2 Installing a DIMM.....................................1-18

1.8.3 Removing a DIMM ..................................1-19

1.8.4 Reconfiguring the System........................1-19

1.9 Installing Expansion Cards.....................................1-20

1.9.1 Installing PCI Cards .................................1-20

1.9.2 Installing ISA Cards.................................1-21

1.9.3 Installing AGP Card.................................1-22

1.10 ASM Pro................................................................1-24

1.11 Remote Diagnostic Management...........................1-25

1.11.1 Installing the RDM Module ......................1-25

1.12 Error Messages......................................................1-26

1.12.1 Software Error Messages........................1-26

1.12.2 System Error Messages ..........................1-26

1.12.3 Correcting Error Conditions.....................1-29

Chapter 2 BIOS Utility

2.1 Entering Setup.........................................................2-2

2.2 System Information..................................................2-3

2.2.1 Processor..................................................2-4

2.2.2 Processor Speed.......................................2-5

2.2.3 Bus Frequency.......................................... 2-5

2.2.4 Internal Cache ...........................................2-5

2.2.5 External Cache..........................................2-5

2.2.6 Floppy Drive A ..........................................2-5

2.2.7 Floppy Drive B ..........................................2-5

xii

2.2.8 IDE Primary Channel Master.....................2-6

2.2.9 IDE Primary Channel Slave.......................2-6

2.2.10 IDE Secondary Channel Master................. 2-6

2.2.11 IDE Secondary Channel Slave..................2-6

2.2.12 Total Memory ............................................2-6

2.2.13 Serial Port 1..............................................2-7

2.2.14 Serial Port 2..............................................2-7

2.2.15 Parallel Port.............................................. 2-7

2.2.16 Pointing Device .........................................2-7

2.2.17 Memory Parity Mode.................................2-7

2.2.18 Onboard USB ............................................2-7

2.3 Product Information ................................................. 2-8

2.3.1 Product Name ........................................... 2-8

2.3.2 System S/N...............................................2-8

2.3.3 Main Board ID ........................................... 2-9

2.3.4 Main Board S/N.........................................2-9

2.3.5 System BIOS Version ................................2-9

2.3.6 System BIOS ID........................................2-9

2.3.7 BIOS Release Date...................................2-9

2.4 Disk Drives............................................................ 2-10

2.4.1 Floppy Drives..........................................2-12

2.4.2 IDE Drives ...............................................2-12

2.5 Power Management...............................................2-16

2.5.1 Power Management Mode.......................2-16

2.5.2 Power Switch < 4 sec. .............................2-17

2.5.3 Wakeup Event.........................................2-17

2.6 Startup Configuration.............................................2-19

2.6.1 Fast POST Mode.....................................2-19

2.6.2 Silent Boot...............................................2-20

2.6.3 Num Lock After Boot............................... 2-20

2.6.4 Memory Test........................................... 2-20

2.6.5 Initialize SCSI Before IDE .......................2-20

2.6.6 System Boot Drive ..................................2-21

2.6.7 Boot From IDE CD-ROM.........................2-21

2.6.8 Boot from LANDesk Service Agent ..........2-21

2.7 Advanced Configuration.........................................2-22

2.7.1 Onboard Devices Configuration ...............2-23

xiii

2.7.2 PnP/PCI System Configuration................2-30

2.7.3 Memory/Cache Configuration..................2-35

2.7.4 CPU Speed Configuration .......................2-37

2.7.5 System Event Configuration....................2-38

2.8 System Security Setup...........................................2-43

2.8.1 Disk Drive Control...................................2-43

2.8.2 Setup Password ......................................2-44

2.8.3 Power-on Password.................................2-48

2.9 Date and Time .......................................................2-49

2.9.1 Date........................................................2-50

2.9.2 Time........................................................2-50

2.10 Load Setup Default Settings ..................................2-51

2.11 Abort Settings Change...........................................2-51

2.12 Leaving Setup........................................................2-52

Chapter 3 SCSI/VGA Combo Card

3.1 Features.................................................................. 3-1

3.1.1 Card Layout...............................................3-2

3.1.2 Jumper Settings........................................3-3

3.1.3 Card Installation........................................3-4

3.2 SCSI Feature...........................................................3-5

3.2.1 Using the SCSI Feature.............................3-5

3.3 Video Function.........................................................3-6

3.3.1 Supported Video Resolutions ....................3-6

List of Figures

1-1 System Board Layout...............................................1-4

xiv

1-2 System Board Jumper and Connector Locations......1-5

1-3 Matching the Fan-Heat Sink Clips with the Holes

on the Processor....................................................1-10

1-4 Inserting the Clip Ends into the Processor Holes ....1-11

1-5 Locking a Wide Clip End........................................1-12

1-6 Locking a Narrow Clip End.....................................1-12

1-7 Installing the processor’s Retention Mechanism .....1-13

1-8 Installing a Pentium II Processor............................ 1-14

1-9 Securing the Pentium II Processor .........................1-14

1-10 Unlocking the Module Latches................................1-15

1-11 Removing the Pentium II Processor....................... 1-15

1-12 Installing the Termination Board.............................1-16

1-13 Installing a DIMM ...................................................1-18

1-14 Removing a DIMM.................................................1-19

1-15 Installing a PCI Card ..............................................1-20

1-16 Installing an ISA Card.............................................1-22

1-17 Installing an AGP Card...........................................1-23

1-18 Installing the RDM Module .....................................1-25

3-1 SCSI/VGA Combo Card Layout................................3-2

List of Tables

1-1 System Board Jumper Settings................................1-6

1-2 Connector Functions................................................ 1-7

1-3 Memory Configurations..........................................1-17

1-4 System Error Messages.........................................1-27

2-1 Parallel Port Operation Mode Settings ...................2-28

2-2 Drive Control Settings............................................2-46

3-1 SCSI/VGA Combo Card Jumper Settings.................3-3

3-2 SCSI/VGA Combo Card Connector Functions ..........3-3

3-3 Supported Video Resolutions...................................3-6

xvi

Chapter

System Board

1.1 Features

The M19A is a dual-processor system board built on an ATX baseboard utilizing two Intel Pentium II processors running at 333/66, 350/100, 400/100, or 450/100 MHz. It is integrated with the Intel 440BX system controller, which consists of the PCI/AGP controller and the PCI/ISA IDE accelerator (PIIX4).

The PCI/AGP controller host bus interface supports a Pentium II processor with 66 or 100 MHz bus frequency. It also provides a 72-bit DRAM that supports synchronous DRAM (SDRAM) DIMMs. The PCI/AGP controller introduces a new technology, which is the Accelerated Graphics Port (AGP) interface. Supporting up to 133 MHz data transfer rate, the AGP interface boosts graphics performance.

The PIIX4 is a multifunctional PCI device controller implementing system functions including PCI IDE, universal serial bus (USB) host/hub, and enhanced power management. It also supports Ultra DMA/33 synchronous DMA-compatible devices.

The four DIMM sockets on board allow memory upgrade to a maximum of 512 MB and supports 72-bit DRAM using synchronous DRAM (SDRAM) DIMMs.

System Board 1-1

A 50-pin Fast SCSI (Small Computer System Interface) and a 68-pin Wide SCSI comes with the system board to connect SCSI devices. Wide SCSI supports 32-bit transfers while fast SCSI uses a 16-bit bus that doubles the clock rate to support data rates of 40 Mb/s.

The M19A system board also supports the USB (Universal Serial Bus) connector, and other standard features such as two UART NS16C550 serial ports, one enhanced parallel port with Enhanced Parallel Port (EPP)/Extended Capabilities Port (ECP) feature, a diskette drive interface, and two embedded hard disk interfaces. The board also includes a built-in 10/100 Mb/s Intel 82558 LAN chip that supports Wake-On-LAN (WOL).

The system supports the power-management function that conforms to the power-saving standards of the U.S. Environmental Protection Agency (EPA) Energy Star program. It also offers the Plug-and-Play feature. This feature saves the user from configuration troubles, thus making the system more user-friendly. The system board supports two optional features, ASM Pro and Remote Diagnostic Management (RDM), that allow better server management. The ASM Pro detects problems in CPU thermal condition, CPU working voltage detection (±12V/±5V/3.3V/1.5V), and PCI bus utilization calculation. It also detects if the CPU fan or the chassis fan malfunctions. RDM allows execution of the RDM diagnostic program from a remote RDM station to fix detected problems or to reboot the system.

The system is fully compatible with MS-DOS V6.X, DOS/V, IBM OS/2 Warp, Novell Netware, Novel SFT III, SCO UNIX, Windows NT and Windows 95 operating systems.

1-2 User’s Guide

1.2 Major Components

The system board has the following major components:

• Supports dual Intel Pentium



II processors

• Four DIMM sockets that accept 16-, 32-, 64- and 128-MB DIMMs

with a maximum of 512-MB system memory

• Two ISA, four PCI, and one AGP bus slots (one PCI and ISA

shared slot)

• 256-KB Flash ROM for system BIOS

• 512-KB pipelined-burst second-level cache built-in Pentium II

CPU

• System clock/calendar with battery backup

• One 50-pin Fast SCSI and one 68-pin Wide SCSI

• I/O APIC device supports for SMP interrupt support

• Integrates an enhanced PCI local bus IDE controller

• Intel 440BX chipset supports AGP (Accelerated Graphics Port)

and Ultra DMA/33 functions

• 10/100 Mb/s Intel 82558 LAN chip that supports Wake-On-LAN

(WOL)

• Two 24-pin RDM interfaces

• IDE hard disk and diskette drive interfaces

• Auxiliary power connector for 280W SPS

• Super I/O, SCSI, memory, and Advanced Server

Management (ASM) controller chipsets

• External ports:

• USB connector • PS/2-compatible keyboard port

• RJ-45 jack • PS/2-compatible mouse port

• Parallel port • Serial port 1 and 2

System Board 1-3

1.3 Layout

23456

789

101115

1819202122

23242526273031

122829

Figure 1-1 shows the system board components.

1 Mouse port 2 Keyboard port 3 USB connector 4 Serial port 2 5 Parallel port 6 Serial port 1 7 RJ-45 8 CPU slots 9 Intel 82558B chipset 10 PCI slots 11 ISA slots 12 AGP slot 13 IOAPIC* 14 Super I/O controller 15 SMM feature connector 16 System BIOS

*I/O Advanced Programmable Interrupt Controller

17 Battery 18 RDM connectors 19 Intel 82371EB (PIIX4) 20 SCSI controller (optional) 21 EIDE connector 1 (primary) 22 EIDE connector 2 (secondary) 23 Wide SCSI connector (68 pin) 24 Narrow SCSI connector (50 pin) 25 FDD connector 26 HDD Fail LED signal connector 27 Regulator 28 DIMM sockets 29 Power connector (Auxilliary) 30 Power connector 31 440BX chipset

Figure 1-1 System Board Layout

1-4 User’s Guide

1.4 Jumpers and Connectors

1.4.1 Jumper and Connector Locations

Figure 1-2 shows the jumper and connector locations on the system board.

Figure 1-2 System Board Jumper and Connector Locations

Jumpers are prefixed “JP”. Connectors are prefixed “CN”. The blackened pin of a jumper or connector represents pin 1.

System Board 1-5

1.4.2 Jumper Settings

Table 1-1 lists the system board jumpers with their corresponding settings and functions.

Table 1-1 System Board Jumper Settings

Jumper Setting Function

LM80 Sel

JP4 1-2/4-5

2-3/5-6*

BIOS Logo

JP6 1-2

2-3*

Password Security

JP7 1-2

2-3*

Sound Output

JP8 1-2*

2-3

Alert Pack & LM80 LM80 Only

Acer OEM

Check password Bypass password

Buzzer Speaker

1-6 User’s Guide

1.4.3 Connector Functions

Table 1-2 lists the different connectors on the system board and their respective functions.

Table 1-2 Connector Functions

Connector Function

CN2 280-watt SPP control connector CN3 Power core connector CN4 PS/2 mouse (above) / keyboard (below) connectors CN7 Power core connector (VCC3 & VCC) CN8 USB connector

CN9 CPU2 Fan Connector CN10 CPU2 Temperature connector CN11 COM2 (lower left), COM1 (lower right), and Parallel

CN12 LDD Fail LED signal connector CN13 Housing fan 1 CN14 RJ45 LAN socket CN15 Housing fan 2 CN16 CPU1 Temperature connector CN17 Narrow SCSI connector CN18 Wide SCSI connector CN19 FDD connector CN20 CPU1 Fan connector CN21 Secondary IDE connector CN22 Primary IDE connector CN23 Housing fan 3 CN24 RDM PS Status connector CN25 Housing fan 4 CN26 Hardware Monitoring Reset switch CN27 Power LED connector CN28 RAS Testing connector CN29 HDD LED connector

port (above)

System Board 1-7

Table 1-2 Connector Functions

Connector Function

CN30 RDM connector CN31 Feature connector CN32 Wake-on-LAN connector CN33 RDM connector CN34 External Speaker connector CN35 PSU/HDD/Fan fail LED CN36 Power switch CN37 Chassis Intrusion switch connector CN38 RDM LED connector CN39 External HDD LED connector CN40 External HDD LED connector CN41 PC/PCI connector for PCI sound card CN42 External ring-in CN43 LAN Panel LED

1-8 User’s Guide

1.5 ESD Precautions

Always observe the following electrostatic discharge (ESD) precautions before installing a system component:

1. Do not remove a component from its antistatic packaging until you are ready to install it.

2. Wear a wrist grounding strap before handling electronic components. Wrist grounding straps are available at most electronic component stores.

Do not attempt the procedures described in the following sections unless you are a qualified technician.

System Board 1-9

1.6 Installing the Pentium II processor

The following section will briefly explain and illustrate how to install the Pentium II processor.

You have to attached the heat sink and fan before installing the Pentium II processor into the system board.

1.6.1 Attaching the Processor Heat Sink and Fan

The Pentium II processor module comes with holes on one side to hold the clips of the heat sink and fan. The upper set of holes (near the latches) on the processor are wider and should match the wider ends of the clips on the heat sink. The lower set of holes are smaller and should match the narrow ends of the heat sink clips.

Wide Clip Ends

Wide Holes

Narrow Holes

Figure 1-3 Matching the Fan-Heat Sink Clips with the Holes on

the Processor

1-10 User’s Guide

Follow these steps when installing the heat sink and fan into the Pentium II processor module:

1. Remove the thermal tape protector at the back of the heat sink.

2. Insert the wide clip ends into the wide holes on the processor and the narrow clip ends into the narrow holes.

Figure 1-4 Inserting the Clip Ends into the Processor Holes

3. Use a screwdriver to press and lock in the wide end of a clip first. Then without lifting the screwdriver, point it downward to press and lock the narrow end of the clip. See Figures 5 and 6 for the illustration of this step.

System Board 1-11

Figure 1-5 Locking a Wide Clip End

Figure 1-6 Locking a Narrow Clip End

4. Repeat step 3 to lock the other clip.

1-12 User’s Guide

1.6.2 Installing a Pentium II Processor

Follow these steps to install the Pentium II processor to the socket on the CPU board.

1. Place the retention mechanism over the processor socket on the CPU board. Secure it with the screws that came with the package.

Figure 1-7 Installing the processor’s Retention Mechanism

2. With the processor module golden fingers pointing downward, align the processor to the posts of the retention mechanism then lower it down. See Figure 1-8.

The golden fingers of the Pentium II module are slotted such that it only fits in one direction. Make sure that the module groove matches the one on the processor socket.

System Board 1-13

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