R TX97-E Pentium Motherboard ® USER'S MANUAL
USER'S NOTICE No part of this product, including the product and software may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form by any means without the express written permission of ASUSTeK COMPUTER INC. (hereinafter referred to as ASUS) except documentation kept by the purchaser for backup purposes. Specifications are subject to change without notice.
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CONTENTS I. INTRODUCTION ........................................................................... How this manual is organized .......................................................... Item Checklist .................................................................................. II. FEATURES .................................................................................... Features of the ASUS TX97-E Motherboard ................................... Introduction to ASUS TX97 Series of motherboards ..
CONTENTS V. SUPPORT SOFTWARE ................................................................ ASUS TX97 Motherboard Series Support CD ................................ LANDesk Client Manager (LDCM) ................................................ Desktop Management Interface (DMI) ............................................ Introducing the ASUS DMI Configuration Utility ............... System Requirements ........................................................... Using the ASUS DMI Configuration Utility ..
FCC & DOC COMPLIANCE Federal Communications Commission Statement This device complies with FCC Rules Part 15. Operation is subject to the following two conditions: • • This device may not cause harmful interference, and This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
I. INTRODUCTION I. INTRODUCTION (Sections/Checklist) How this manual is organized This manual is divided into the following sections: I. Introduction: Manual information and checklist II. Features: Information and specifications concerning this product III. Installation: Instructions on setting up the motherboard. IV. BIOS Setup: BIOS software setup information. V. Support Software: Installation of software drivers and utilities. VI. ASUS PCI-SC200: Installation of an optional Fast-SCSI card. VII.
II. FEATURES Features of the ASUS TX97-E Motherboard II. FEATURES (Features) The ASUS TX97-E is carefully designed for the demanding PC user who wants many intelligent features in a small package. This motherboard: • Intel Chipset: Features Intel's 430TX PCIset with I/O subsystems. • Multi-Processor/Multi-Speed Support: Intel Pentium® 75-200MHz (P55C-MMX™, P54C/P54CS), Cyrix® P166+ (Rev 2.7 & later), AMD-K5™ (PR75-133MHz), AMDK6™ (PR200-233MHz).
II. FEATURES Introduction to ASUS TX97 Series of motherboards II. FEATURES (TX97 Series) Performance: • SDRAM Optimized Performance - ASUS TX97 series of motherboards support the new generation memory - Synchronous Dynamic Random Access Memory (SDRAM) which increases the data transfer rate from 264MB/s max using EDO memory to 528MB/s max.
II. FEATURES • • II. FEATURES (TX97 Series) • • • • • • 10 Voltage Monitoring and Alert - System voltage levels are monitored to ensure stable current to critical motherboard components. Voltage specifications are more critical for future processors, so monitoring is necessary to ensure proper system configuration and management.
II. FEATURES Parts of the ASUS TX97-E Motherboard PS/2 Mouse, USB, IrDA ATX Power Serial, Parallel, Floppy II.
III. INSTALLATION Map of the ASUS TX97-E Motherboard Serial Ports COM 1 PS/2 Mouse, USB, IrDA COM 2 Floppy Drives ATX Power Switch ATX Power Input Secondary IDE SIMM Socket 4 (32-bit, 72-pin module) 2 3 2 3 MediaBus Extension DIMM Socket 1 (64-bit, 168-pin module) SIMM Socket 3 (32-bit, 72-pin module) 0 1 DIMM Socket 2 (64-bit, 168-pin module) SIMM Socket 2 (32-bit, 72-pin module) Row 0 1 R III.
III. INSTALLATION Jumpers 1) 2) 3) 4) 5) 6) IO SEL BBLKW RTCLR VID0, VID1, VID2 FS0, FS1, FS2 BF0, BF1 p. 15 p. 15 p. 16 p. 17 p. 18 p. 18 Multi-I/O Selection (Enable/Disable) Flash ROM Boot Block Program (Disable/Enable) Real Time Clock RAM (Operation/Clear Data) CPU Voltage Selection CPU External Clock (BUS) Frequency Selection CPU:BUS Frequency Ratio p. 19 p. 20 p. 21 p. 23 p. 24 p.
III. INSTALLATION Installation Steps Before using your computer, you must complete the following steps: 1. 2. 3. 4. 5. 6. Set Jumpers on the Motherboard Install DRAM Modules Install the Central Processing Unit (CPU) Install Expansion Cards Connect Ribbon Cables, Cabinet Wires, and Power Supply Setup the BIOS Software 1. Jumpers III. INSTALLATION (Jumpers) Several hardware settings are made through the use of jumper caps to connect jumper pins (JP) on the motherboard.
III. INSTALLATION Jumper Settings 1. Onboard Multi-I/O Selection (IO SEL) You can selectively disable each onboard Multi-I/O item (floppy, serial, parallel, and IrDA) through Chipset Features Setup of BIOS SOFTWARE or disable all Multi-I/O items at once with the following jumper in order to use your own Multi-I/O card. Multi-I/O SIO Enable [1-2] (Default) Disable [2-3] I/O 1 2 3 R Enable (Default) 1 2 3 III. INSTALLATION (Jumpers) I/O Disabled Super Multi I/O Setting (Enable / Disable) 2.
III. INSTALLATION 3. Real Time Clock (RTC) RAM (RTCLR) The CMOS RAM is powered by the onboard button cell battery. To clear the RTC data: (1) Turn off your computer, (2) Move this jumper to “Clear Data,” (3) Move the jumper back to “Operation,” (4) Turn on your computer, (5) Hold down during bootup and enter BIOS setup to re-enter user preferences. Battery Test Jumper (RTCLR) You can test the battery’s current by removing this jumper and attaching a current meter to pins 2&3.
III. INSTALLATION Compatible Cyrix CPU Identification The only Cyrix CPU that is supported on this motherboard is labeled Cyrix 6x86 P166+ but must be Revision 2.7 and later. Look on the underside of the CPU for the serial number. The number should read G8DC6620A or larger.
III. INSTALLATION 5. CPU External (BUS) Frequency Selection (FS0, FS1, FS2) These jumpers tell the clock generator what frequency to send to the CPU. These allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the advertised CPU speed). 6. CPU to BUS Frequency Ratio (BF0, BF1) These jumpers set the frequency ratio between the Internal frequency of the CPU and the External frequency (called the BUS Clock) within the CPU.
III. INSTALLATION 2. System Memory (SIMM & DIMM) This motherboard supports four 72-pin, 32-bit SIMMs (Single Inline Memory Modules) of 4, 8, 16, 32, or 64MB to form a memory size between 8MB to 256MB. The SIMMs can be either 60ns or 70ns Fast Page Mode (FPM) (Asymmetric or Symmetric), or Enhanced Data Out (EDO) (BEDO & Parity are not supported). SIMMs must be installed in pairs so that each Row (see Map of Motherboard for Row locations) contains 64-bits of the same size and type of memory chips.
III. INSTALLATION SIMM Memory Installation 1. The SIMM memory modules will only fit in one orientation as shown because of a "Plastic Safety Tab" on one end of the SIMM sockets which requires the "Notched End" of the SIMM memory modules. 1 2 3 4 R III. INSTALLATION (System Memory) Notched End 72 Pin SIMM Sockets 2. Press the memory module firmly into place starting from a 45 degree angle making sure that all the contacts are aligned with the socket. 3.
III. INSTALLATION DIMM Memory Installation Insert the module(s) as shown. Because the number of pins are different on either side of the breaks, the module will only fit in the orientation as shown. SIMM modules have the same pin contact on both sides. DIMM modules are longer and have different pin contact on each side and therefore have a higher pin density. 20 Pins 60 Pins Dimm Socket 1 Dimm Socket 2 III.
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III. INSTALLATION 3. Central Processing Unit (CPU) The motherboard provides a 321-pin ZIF Socket 7 that is backwards compatible with ZIF Socket 5 processors. The CPU that came with the motherboard should have a fan attached to it to prevent overheating. If this is not the case then purchase a fan before you turn on your system. Apply thermal jelly to the CPU top and then install the fan onto the CPU.
III. INSTALLATION 4. Expansion Cards WARNING: Make sure that you unplug your power supply when adding or removing expansion cards or other system components. Failure to do so may cause severe damage to both your motherboard and expansion cards. First read your expansion card documentation on any hardware and software settings that may be required to setup your specific card.
III. INSTALLATION Both ISA and PCI expansion cards may need to use IRQs. System IRQs are available to cards installed in the ISA expansion bus first, and any remaining IRQs are then used by PCI cards. Currently, there are two types of ISA cards. The original ISA expansion card design, now referred to as “Legacy” ISA cards, requires that you configure the card’s jumpers manually and then install it in any available slot on the ISA bus. You may use Microsoft's Diagnostic (MSD.
III. INSTALLATION 5. External Connectors WARNING: Some pins are used for connectors or power sources. These are clearly separated from jumpers in "Map of the ASUS Motherboard." Placing jumper caps over these will cause damage to your motherboard. IMPORTANT: Ribbon cables should always be connected with the red stripe on the Pin 1 side of the connector. The four corners of the connectors are labeled on the motherboard. Pin 1 is the side closest to the power connector on hard drives and floppy drives.
III. INSTALLATION 3. Parallel Printer Connector (26 Pin Block) Connection for the included parallel port ribbon cable with mounting bracket. Connect the ribbon cable to this connection and mount the bracket to the case on an open slot. It will then be available for a parallel printer cable. You can enable the parallel port and choose the IRQ through "Onboard Parallel Port" in Chipset Features of the BIOS SOFTWARE.
III. INSTALLATION 5. CPU Cooling Fan Connector (FAN) This connector supports a 3-pin CPU cooling fan of 500mAMP (6WATT) or less with a minimum of 3,500RPM. Depending on the fan manufacturer, the wiring and plug may be different. The red wire should be Positive, the black should be Ground, and the yellow wire should be Rotation signal. WARNING: The CPU and/or motherboard will overheat if there is no airflow across the CPU and onboard heatsinks.
III. INSTALLATION 7. Primary / Secondary IDE connectors (Two 40-pin Block) These connectors support the provided IDE hard disk ribbon cable. After connecting the single end to the board, connect the two plugs at the other end to your hard disk(s). If you install two hard disks, you must configure the second drive to Slave mode by setting its jumper accordingly. Please refer to the documentation of your hard disk for the jumper settings.
III. INSTALLATION 5.0V 5.0V -5.0V GND GND GND PS-ON GND -12.0V 3.3V 9. ATX Power Supply Connector (20-pin block) This connector connects to a ATX power supply. The plug from the power supply will only insert in one orientation because of the different hole sizes. Find the proper orientation and push down firmly making sure that the pins are aligned. 12.0V 5VSB PW-0K GND 5.0V GND 5.0V GND 3.3V 3.
III. INSTALLATION R Message LED SMI Lead ATX Power Switch* Reset SW +5V GND GND GND GND +5V NC GND LOCK GND +5V GND GND SPKR III. INSTALLATION (Connectors) 11. Message LED Lead (TB LED) This indicates whether a message has been received from a fax/modem. The LED will remain lit when there is no signal and blink when there is data transfer or waiting in the inbox). 12.
III. INSTALLATION 17. PS/2 Mouse, USB, Infrared Connector (18-pin block) If you are using a PS/2 mouse, USB, or Infrared devices, you must purchase an optional external connector set. The external connector set connects to the 18 pin block and mounts to an open slot on your computer's chssis. The system will direct IRQ12 to the PS/2 mouse if one is detected. If not detected, expansion cards can use IRQ12.
III. INSTALLATION Power Connection Procedures III. INSTALLATION (Power Connections) 1. After all jumpers and connections are made, close the system case cover. 2. Make sure that all switches are in the off position as marked by . 3. Connect the power supply cord into the power supply located on the back of your system case as instructed by your system user's manual. 4. Connect the power cord into a power outlet that is equipped by a surge protector. 5.
IV. BIOS SOFTWARE Support Software FILELIST.TXT - View this file to see the files included in the support software. PFLASH.EXE - This is the Flash Memory Writer utility that updates the BIOS by uploading a new BIOS file to the programmable flash ROM chip on the motherboard. To determine the BIOS version, check the last four numbers of the code displayed on the upper left-hand corner of your screen during bootup. Larger numbers represent a newer BIOS file.
IV. BIOS SOFTWARE 2. Update BIOS Main Block from File This option updates the BIOS from a file on the disk. This can either be a new file or a backup file created by the “Save Current BIOS to File” option. This will not update the Boot Block if the Boot Block is different. You will be prompted with the following if advanced features if necessary. Boot Block of New BIOS is different from old one !!! Please Use 'Advanced Feature' to flash whole bios !!! 3.
IV. BIOS SOFTWARE Managing & Updating your Motherboard's BIOS Upon first use of the computer system: 1. Create a bootable system floppy diskette by typing [FORMAT A:/S] from the DOS prompt without creating "AUTOEXEC.BAT" and "CONFIG.SYS" files. 2. Copy PFLASH.EXE to your new diskette. 3. Run PFLASH.EXE from your new diskette and select option 1 "Save Current BIOS to File." Enter the "Current BIOS Revision:" for the file name.
IV. BIOS SOFTWARE 6. BIOS Setup The motherboard supports two programmable Flash ROM chips: 5 Volt and 12 Volt. Either of these memory chips can be updated when BIOS upgrades are released. Use the Flash Memory Writer utility to download the new BIOS file into the ROM chip as described in detail in this section. All computer motherboards provide a Setup utility program for specifying the system configuration and settings.
IV. BIOS SOFTWARE Load Defaults The “Load BIOS Defaults” option loads the minimized settings for troubleshooting. “Load Setup Defaults”, on the other hand, is for loading optimized defaults for regular use. Choosing defaults at this level, will modify all applicable settings. A section at the bottom of the above screen displays the control keys for this screen. Take note of these keys and their respective uses.
IV. BIOS SOFTWARE Details of Standard CMOS Setup: Date To set the date, highlight the “Date” field and then press the page up/page down or +/ - keys to set the current date. Follow the month, day and year format. Valid values for month, day and year are: Month: (1 to 12), Day: (1 to 31), Year: (up to 2099) Time To set the time, highlight the “Time” field and then press the page up/page down or +/- keys to set the current time. Follow the hour, minute and second format.
IV. BIOS SOFTWARE The MODE entry is for IDE hard disks only, and can be ignored for MFM and ESDI drives. This entry provides three options: Normal, Large, LBA, or Auto (see below). Set MODE to the Normal for IDE hard disk drives smaller than 528MB; set it to LBA for drives over 528MB that support Logical Block Addressing (LBA) to allow larger IDE hard disks; set it to Large for drives over 528MB that do not support LBA. Large type of drive can only be used with MS-DOS and is very uncommon.
IV. BIOS SOFTWARE BIOS Features Setup This “BIOS Features Setup” option consists of configuration entries that allow you to improve your system performance, or let you set up some system features according to your preference. Some entries here are required by the motherboard’s design to remain in their default settings. NOTE: SETUP Defaults are noted in parenthesis next to each function heading. Details of BIOS Features Setup IV.
IV. BIOS SOFTWARE Boot Sequence (C,A) This field determines where the system looks first for an operating system. Options are A,CDROM,C; CDROM,C,A; A,C; C,A The setup default setting is to check first the hard disk and then the floppy drive; that is, C, A. Boot Up Floppy Seek (Disabled) When enabled, the BIOS will seek the floppy "A" drive one time.
IV. BIOS SOFTWARE Boot Up NumLock Status (On) This field enables users to activate the Number Lock function upon system boot. Boot Up System Speed (High) This has no function and should be left on the setup default. Typematic Rate Setting (Disabled) When enabled, you can set the two typematic controls listed next. Setup default setting is Disabled. Typematic Rate (Chars/Sec) (6) This field controls the speed at which the system registers repeated keystrokes. Options range from 6 to 30 characters per second.
IV. BIOS SOFTWARE SDRAM CAS# Latency (3T) If you use ASUS SDRAM DIMM modules, you can set this to 2T for better performance, otherwise leave on default or check with your vendor for DIMM specs. SDRAM Speculative Read (Disabled) If Enabled, the CPU will issue predict commands to access the DRAM, if a miss occurs, the CPU will cancel this command. Some operating systems under certain situations have a problem utilizing this feature so it is normally Disabled.
IV. BIOS SOFTWARE Onboard Serial Port 1 (3F8H/IRQ4) Settings are 3F8H/IRQ4, 2F8H/IRQ3, 3E8H/IRQ4, 2E8H/IRQ10, and Disabled for the onboard serial connector. Onboard Serial Port 2 (2F8H/IRQ3) Settings are 3F8H/IRQ4, 2F8H/IRQ3, 3E8H/IRQ4, 2E8H/IRQ10, and Disabled for the onboard serial connector. Onboard Parallel Port (378H/IRQ7) This field sets the address of the onboard parallel port connector. You can select either: 3BCH / IRQ 7, 378H / IRQ 7, 278H / IRQ 5, Disabled.
IV. BIOS SOFTWARE Power Management Setup This “Power Management Setup” option allows you to reduce power consumption. This feature turns off the video display and shuts down the hard disk after a period of inactivity. IV. BIOS (Chipset Features) NOTE: SETUP Defaults are noted in parenthesis next to each function heading. Details of Power Management Setup IV. BIOS (Power Management) Power Management (User Define) This field acts as the master control for the power management modes.
IV. BIOS SOFTWARE Video Off Method (V/H SYNC + Blank) This field defines the video off features. Three options are available: V/H SYNC + Blank, DPMS, and Blank Only. The first option, which is the default setting, blanks the screen and turns off vertical and horizontal scanning; DPMS (Display Power Management System) allows the BIOS to control the video display card if it supports the DPMS feature; Blank Screen only blanks the screen.
IV. BIOS SOFTWARE Fan Monitor (xxxxRPM) The onboard hardware monitor is able to detect the Chassis Fan Speed, CPU Fan Speed, and the Power Supply Fan Speed in Rotations Per Minute (RPM). These values refresh upon any key entries in the BIOS setup screen. Set to Ignore if one of these are not used so that error messages will not be given. Thermal Monitor (xxxC/xxxF) The onboard hardware monitor is able to detect the CPU and Motherboard temperatures. These values refresh upon key entries.
IV. BIOS SOFTWARE Details of PNP and PCI Setup PNP OS Installed (No) When Plug and Play operating systems (OS) are installed, interrupts may be reassigned by the OS when Yes is selected. When a non-Plug and Play OS is installed or to prevent reassigning of interrupt settings, select No here. Slot 1/2/3/4 IRQ (Auto) The first four fields on the screen set how IRQ use is determined for each PCI slot. Slot 1 (Right) is nearest the memory sockets.
IV. BIOS SOFTWARE Load BIOS Defaults This “Load BIOS Defaults” option allows you to load the troubleshooting default values permanently stored in the BIOS ROM. These default settings are non-optimal and disable all high performance features. To load these default settings, highlight “Load BIOS Defaults” on the main screen and then press the key. The system displays a confirmation message on the screen. Press the key and then the key to confirm.
IV. BIOS SOFTWARE Supervisor Password and User Password IV. BIOS (Passwords) These two options set the system passwords. “Supervisor Password” sets a password that will be used to protect the system and the Setup utility; “User Password” sets a password that will be used exclusively on the system. By default, the system comes without any passwords. To specify a password, highlight the type you want and then press the key. A password prompt appears on the screen.
IV. BIOS SOFTWARE IDE HDD Auto Detection This “IDE HDD Auto Detection” option detects the parameters of an IDE hard disk drive, and automatically enters them into the Standard CMOS Setup screen. ROM PCI/ISA BIOS () CMOS SETUP UTILITY AWARD SOFTWARE, INC.
IV. BIOS SOFTWARE IMPORTANT: If your hard drive was already formatted on an older previous system, incorrect parameters may be detected. You will need to enter the correct parameters manually or use low-level format if you do not need the data stored on the hard drive. If the parameters listed differ from the ones used when the drive was formatted, the drive will not be readable. If the auto-detected parameters do not match the ones that should be used for your drive, do not accept them.
V. SUPPORT SOFTWARE ASUS TX97 Motherboard Series Support CD (Rev. 3.00) Run INSTALL.EXE in the root directory of this CD for the following options: LDCM Local Setup: Installs software to monitor the local system. The LANDesk Client Manager must be installed in order to use the hardware manager features. LDCM Administrator Setup: Installs software to monitor PC systems on the network within the same bridge address with the Local software installed.
V. SUPPORT SOFTWARE • Custom Setup: (For Experienced Users) 1. Choose File | New from the pull-down menu of the "Untitled" screen. Type in a system name. 2. Make the appropriate settings on the right-hand side. Note following: - I2C and Network should not be modified - Currently only ATI Video cards can be monitored by LDCM, do not select Video ATI if you are using other video cards. 3. Choose LM78 from the pull-down menu.
V. SUPPORT SOFTWARE Desktop Management Interface (DMI) Introducing the ASUS DMI Configuration Utility This motherboard supports DMI within the BIOS level and provides a DMI Configuration Utility to maintain the Management Information Format Database (MIFD). DMI is able to auto-detect and record information pertinent to a computer’s system such as the CPU type, CPU speed, and internal/external frequencies, and memory size.
V. SUPPORT SOFTWARE Using the ASUS DMI Configuration Utility Edit DMI (or delete) Use the ←→ (left-right) cursors to move the top menu items and the ↑↓ (up-down) cursor to move between the left hand menu items. The bottom of the screen will show the available keys for each screen. Press enter at the menu item to enter the right hand screen for editing. “Edit component” appears on top. The reversed color field is the current cursor position and the blue text are available for editing.
V. SUPPORT SOFTWARE Save MIFD You can save the MIFD (normally only saved to flash ROM) to a file by entering the drive and path here. If you want to cancel save, you may press ESC and a message “Bad File Name” appears here to show it was not saved. Load MIFD You can load the disk file to memory by entering a drive and path and file name here. Load BIOS Defaults V. SOFTWARE (Using DMI Utility) You can load the BIOS defaults from a MIFD file and can clear all user modified and added data.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (SCSI BIOS) SCSI BIOS and Drivers Aside from the system BIOS, the Flash memory chip on the motherboard also contains the SCSI BIOS. This SCSI BIOS works in conjunction with the optional ASUS PCI-SC200 SCSI controller card to provide a complete PCI Fast SCSI-2 interface. All SCSI devices you install to your system require driver software to function. The SCSI BIOS directly supports SCSI hard disks under the DOS, Windows and OS/2 environments.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (Setup) The ASUS PCI-SC200 SCSI Interface Card Your motherboard may have come with an optional SCSI (Small Computer System Interface) controller card, the PCI-SC200. The card is also available separately. This card works with the SCSI BIOS on the motherboard. Together, they provide a complete PCI Fast SCSI-2 interface. With the card installed in your system you can connect SCSI devices installed in your system case to the internal connector on the card.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (Jumpers) Setting the INT Assignment You must use PCI INT A setting in order to properly assign the card's interrupt. On the ASUS PCI-SC200, you assign the INT by setting jumper JP1 or JP2. The default setting for the card already is INT A, so you do not need to change the setting to use the ASUS PCI-SC200 with this motherboard.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (SCSI ID Numbers) Decide whether or not you need to terminate the ASUS PCI-SC200 based on its position in the SCSI chain. Only the devices at each end of the chain need to be terminated. If you have only internal or only external devices connected to the ASUS PCI-SC200, then you must terminate the ASUS PCI-SC200. If you have both internal and external devices connected, you must not terminate the card. See the following example which illustrates this concept.
VII. ASUS I-A16C Audio Card NOTE: The ASUS I-A16C 16-bit ISA audio card comes with certain motherboard bundles only and is not for sale separately. ASUS I-A16C Audio Features Creative Labs ViBRA 16C PnP Audio Chip Full Duplex Supports 16/8 bit PCM 5KHz to 44.1KHz Wave Table Upgradeable Software Includes: DOS and Window 3.1 Drivers Windows 95 Driver Wave Editor Wave OLE Quick CD Mixer Control Quick Player VII.
VII. ASUS I-A16C Audio Card Layout and Connectors Mitsumi Audio In Sony Audio In Panasonic Audio In PC Speaker In Volume Control Wave Table Upgrade PC Speaker Out Speaker Out Line Out VII. ASUS I-A16C (Layout / Connectors) Line In Microphone MIDI/Game Connectors The audio input connectors are used when you wish to control software mixer settings (bass, treble, volume, etc.) for audio CD's that are played with your CD-ROM.
