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motherboard A7N8X-LA (explorer 2) user guide
ii checklist contents A7N8X-LA (explorer 2) specifications summary ............................ iii 1. motherboard layout ............................................................... 1 2. central processing unit (cpu) .............................................. 2 3. system memory .................................................................... 3 memory configurations .......................................................... 3 installing a dimm ................................................................... 4 4. expansion slots ..................................................................... 5 standard interrupt assignments ............................................ 5 irq assignments for this motherboard .................................. 5 pci slots ................................................................................ 6 agp slot ................................................................................ 6 5. jumper .................................................................................. 7 6. connectors ............................................................................ 8 product name: A7N8X-LA explorer 2 manual revision: v.1 e1274 release date: april 2003
iii socket a for amdathlon/athlon xp supports up to athlon xp 3200+ nvidia nforce2 igp nvidia mcp-t 333/266 mhz 2 x 184-pin ddr dimm sockets for up to 2gb memory supports pc2700/pc2100 double-sided ddr 1 x agp 8x slot 3 x pci slots 2 x ultradma 100/66/33 connectors pio mode 3/4 supports atapi ide, cd-rom, cd-r, cd-rw and ls-120 mcp-t embedded audio controller with realtek alc650 6-channel audio codec subsystem ac?7 2.2 compliant realtek 8201bl lan phy supports 10/100 mbps agere fw802c phy supports 2 x 1394 ports with 400/200/100mbps data transfer wakeup on ring, lan, keyboard, ps/2 mouse, rtc timer supports acpi str (s3) function restart/off setup of ac recovery from power failure super i/o integrated monitoring of cpu and chassis fan rotations and cpu/chassis temperature 1 x parallel port 1 x serial port 1 x ps/2 keyboard port 1 x ps/2 mouse port 1 x vga port 4 x usb 2.0 ports 1 x rj-45 port 1 x ieee 1394 port line in/line out/microphone ports usb 2.0 connector for 2 additional usb ports ieee 1394 connector for an additional 1394 port tv-out connector cpu/chassis fan connectors 20-pin atx power connectors s/pdif-out connector cd/aux audio connectors front headphone connector front mic-in connector cpu chipset front side bus (fsb) memory expansion slots ide onboard audio onboard lan onboard ieee 1394 special features hardware monitoring rear panel i/o internal i/o A7N8X-LA (explorer 2) specifications summary
iv bios features industry standard form factor 4mb flash rom, ami bios with enhanced acpi, dmi, green, pnp features year 2000 compliant usb 2.0/1.1, pci 2.2 microatx form factor: 9.6 in x 9.6 in (24.5 cm x 24.5 cm) A7N8X-LA (explorer 2) specifications summary
asus A7N8X-LA (explorer 2) motherboard 1 1. motherboard layout 24.5cm (9.64in) ide1 floppy1 A7N8X-LA /explorer2 nvidia mcp-t chipset accelerated graphics port (agp8x1) nvidia nforce2 igp atx power connector super i/o 4mb bios pci 1 ps/2 t: mouse b: keyboard realtek rtl8201 cha_fan1 agere 1394 phy audio codec below:mic in center:line out top:line in ddr dimm1 (64/72 bit, 184-pin module) 01 ddr dimm3 (64/72 bit, 184-pin module) 4 5 pci 2 pci 3 socket 462 24.5cm (9.64in) cpu_fan1 rj-45 top: usb1 usb2 bottom: ide2 1394 top: usb1 usb2 bottom: clrtc1 buzz1 bat1 j11 usb56 hpanel ieee1394_1 cd1 aux1 fp_mic1 hjack1 aspdif1 com1 parallel port vga tv_out
2 asus A7N8X-LA (explorer 2) motherboard installing the cpu follow these steps to install a cpu. 1. locate the socket 462 and open it by pulling the lever gently sideways away from the socket. then lift the lever upwards. the socket lever must be fully opened (90 to 100 degrees). 2. insert the cpu with the correct orientation. the notched or golden corner of the cpu must be oriented toward the inner corner of the socket base nearest to the lever hinge. 2. central processing unit (cpu) the motherboard provides a socket a (462) for cpu installation. amd processors offer gigahertz speeds to support all latest computing platforms and applications. the A7N8X-LA supports amd athlon/athlon xp 3200+ processors. this motherboard supports 333/266mhz front side bus (fsb), and allows data transfers of up to 5.4gb/s with pc2700 ddr. each amd cpu has a ?arked?corner. this corner is usually indicated with a notch and/or a golden square or triangle. refer to this indicator while orienting the cpu. a fan and a heatsink should be attached to the cpu to prevent overheating. the cpu fits only in one correct orientation. do not force the cpu into the socket to prevent bending the pins and damaging the cpu! A7N8X-LA/explorer2 A7N8X-LA/explorer2 socket 462 amd cpu cpu notch lock cpu notch to inner corner lever
asus A7N8X-LA (explorer 2) motherboard 3 3. system memory the motherboard comes with two double data rate (ddr) dual inline memory module (dimm) sockets. these sockets support up to 2gb system memory using 184-pin unbuffered non-ecc pc2700/pc2100 double-sided ddr dimms. the following figure illustrates the location of the ddr dimm sockets. make sure to unplug the power supply before adding or removing dimms or other system components. failure to do so may cause severe damage to both the motherboard and the components. follow these steps to install a dimm. 1. unlock a dimm socket by pressing the retaining clips outward. 2. align a dimm on the socket such that the notch on the dimm matches the break on the socket. 3. firmly insert the dimm into the socket until the retaining clips snap back in place and the dimm is properly seated. installing a dimm you may install 64mb, 128mb, 256mb, 512mb, and 1gb ddr dimms into the dimm sockets using the memory configurations in this section. unlocked retaining clip ddr dimm notch caution: dimms are keyed to fit with only one direction. do not force a dimm into a socket to avoid damaging the dimm. A7N8X-LA/explorer2 A7N8X-LA/explorer2 184-pin ddr dimm sockets 80 pins 104 pins ddr1 ddr3
4 asus A7N8X-LA (explorer 2) motherboard 4. expansion slots the motherboard has three pci slots and one accelerated graphics port (agp) slot. to install and configure an expansion card: 1. install an expansion card following the instructions that came with the chassis. 2. turn on the system and change the necessary bios settings, if any. 3. assign an irq to the card. refer to the tables below. 4. install the drivers and/or software applications for the expansion card according to the card documentation. standard interrupt assignments irq priority standard function 0 1 system timer 1 2 keyboard controller 2 n/a programmable interrupt 3* 11 communications port (com2) 4* 12 communications port (com1) 5* 13 sound card (sometimes lpt2) 6 14 floppy disk controller 7* 15 printer port (lpt1) 8 3 system cmos/real time clock 9* 4 acpi mode when used 10* 5 irq holder for pci steering 11* 6 irq holder for pci steering 12* 7 ps/2 compatible mouse port 13 8 numeric data processor 14* 9 primary ide channel 15* 10 secondary ide channel * these irqs are usually available for isa or pci devices. irq assignments for this motherboard abcdefgh pci slot 1 shared pci slot 2 used pci slot 3 used agp slot shared onboard usb controller 1 onboard lan onboard audio onboard 1394 controller
asus A7N8X-LA (explorer 2) motherboard 5 install only +1.5v agp cards on this motherboard! pci slots there are three (3) 32-bit pci slots on this motherboard. the slots support pci cards such as a lan card, scsi card, usb card, and other cards that comply with pci specifications. the figure below shows a typical pci card installed into a slot. agp slot this motherboard has an accelerated graphics port (agp) slot that supports agp 8x cards. when you buy an agp card, make sure that you ask for one with +1.5v specification. note the notches on the card golden fingers to ensure that they fit the agp slot on your motherboard. A7N8X-LA/explorer2 A7N8X-LA/explorer2 accelerated graphics port (agp8x) agp card without retention notch
6 asus A7N8X-LA (explorer 2) motherboard 5. jumper 1. clear rtc (3-pin clrtc1) this jumper allows you to clear the real time clock (rtc) ram in cmos. you can clear the cmos memory of date, time, and system setup parameters by erasing the cmos rtc ram data. the ram data in cmos, that include system setup information, is powered by the onboard button cell battery. to erase the rtc ram: 1. turn off the computer and unplug the power cord. 2. move the jumper cap from pins 1-2 (default) to pins 2-3 (clear cmos). keep the cap on pins 2-3 for about 5~10 seconds, then move the cap back to pins 1-2. 3. plug the power cord and turn on the computer. 4. hold down the key during the boot process and enter bios setup to re-enter data. except when clearing the rtc ram, never remove the jumper caps on default position. removing the cap will cause system boot failure! A7N8X-LA/explorer2 A7N8X-LA/explorer2 clear rtc ram clrtc1 normal clear cmos (default) 23 12
asus A7N8X-LA (explorer 2) motherboard 7 2. clear password (3-pin j11) this jumper allows you to clear the password in cmos. to erase the password move the jumper cap from pins 1-2 (default) to pins 2-3 (clear password). keep the cap on pins 2-3 for about 5~10 seconds, then move the cap back to pins 1-2. plug the power cord and turn on the computer. hold down the key during the boot process and enter bios setup to re-enter data. A7N8X-LA/explorer2 A7N8X-LA/explorer2 clear password setting j11 normal clear password (default) 23 12
8 asus A7N8X-LA (explorer 2) motherboard 6. connectors this section describes and illustrates the internal connectors on the motherboard. 1. floppy disk drive connector (34-1 pin floppy1) this connector supports the provided floppy drive ribbon cable. after connecting one end to the motherboard, connect the other end to the floppy drive. (pin 5 is removed to prevent incorrect insertion when using ribbon cables with pin 5 plug). 2. atx power connectors (20-pin atxpwr1) these connectors connect to an atx 12v power supply. the plugs from the power supply are designed to fit these connectors in only one orientation. find the proper orientation and push down firmly until the connectors completely fit. make sure that your atx 12v power supply can provide 8a on the +12v lead and at least 1a on the +5-volt standby lead (+5vsb). the minimum recommended wattage is 230w, or 300w for a fully configured system. the system may become unstable and may experience difficulty powering up if the power supply is inadequate. A7N8X-LA/explorer2 note: orient the red markings on the floppy ribbon cable to pin 1 A7N8X-LA/explorer2 floppy disk drive connector pin 1 floppy1 A7N8X-LA/explorer2 A7N8X-LA/explorer2 atx power connector atxpwr1 +3.3vdc -12.0vdc com ps_on# com com com -5.0vdc +5.0vdc +5.0vdc pwr_ok +12.0vdc +3.3vdc +3.3vdc com +5.0vdc com +5.0vdc com +5vsb
asus A7N8X-LA (explorer 2) motherboard 9 3. ide connectors (40-1 pin ide1, ide2) this connector supports the provided ultradma/100/66/33 ide hard disk ribbon cable. connect the cable s blue connector to the primary (recommended) or secondary ide connector, then connect the gray connector to the ultradma/100/66/33 slave device (hard disk drive) and the black connector to the ultradma/100/66/33 master device. it is recommended that you connect non-ultradma/100/66/33 devices to the secondary ide connector. if you install two hard disks, you must configure the second drive as a slave device by setting its jumper accordingly. refer to the hard disk documentation for the jumper settings. bios supports specific device bootup. if you have more than two ultradma/100/66/33 devices, purchase another ultradma/100/66/33 cable. you may configure two hard disks to be both master devices with two ribbon cables one for the primary ide connector and another for the secondary ide connector. 1. pin 20 on each ide connector is removed to match the covered hole on the ultradma cable connector. this prevents incorrect orientation when you connect the cables. 2. the hole near the blue connector on the ultradma/100/66 cable is intentional. A7N8X-LA/explorer2 A7N8X-LA/explorer2 ide connectors note: orient the red markings (usually zigzag) on the ide ribbon cable to pin 1. ide2 pin 1 ide1
10 asus A7N8X-LA (explorer 2) motherboard 4. cpu and chassis fan connectors (3-pin cpu_fan1, cha_fan1) the fan connectors support cooling fans of 350ma~740ma (8.88w max.) or a total of 1a~2.22a (26.64w max.) at +12v. connect the fan cables to the fan connectors on the motherboard, making sure that the black wire of each cable matches the ground pin of the connector. do not forget to connect the fan cables to the fan connectors. lack of sufficient air flow within the system may damage the motherboard components. these are not jumpers! do not place jumper caps on the fan connectors! 5. internal audio connectors (4-pin cd1, aux1) these connectors allow you to receive stereo audio input from sound sources such as a cd-rom, tv tuner, or mpeg card. A7N8X-LA/explorer2 A7N8X-LA/explorer2 12-volt cooling fan power cha_fan1 cpu_fan1 gnd rotation +12v gnd rotation +12v A7N8X-LA/explorer2 A7N8X-LA/explorer2 internal audio connectors aux1 (white) cd1 (black) right audio channel left audio channel ground right audio channel left audio channel ground
asus A7N8X-LA (explorer 2) motherboard 11 7. ieee 1394 connector (10-1 pin ieee1394_1) this connector is for a 10-to-6-pin 1394 serial connector cable that connects to a 1394 module. attach the 10-1 pin cable plug to this connector, and the 6-pin cable plug to the 1394 module. you may also connect a 1394-compliant internal hard disk to this connector. 6. usb headers (10-1 pin usb56) if the usb ports on the rear panel are inadequate, a usb header is available for additional usb ports. the usb header complies with usb 2.0 specification that supports up to 480 mbps connection speed. this speed advantage over the conventional 12 mbps on usb 1.1 allows faster internet connection, interactive gaming, and simultaneous running of high-speed peripherals. you may connect a usb module to the usb header. never connect a usb cable to any of the ieee 1394 connectors. doing so will damage the motherboard! A7N8X-LA/explorer2 A7N8X-LA/explorer2 usb 2.0 header usb56 usb+5v usb_p6- usb_p6+ gnd nc usb+5v usb_p5- usb_p5+ gnd 1 A7N8X-LA/explorer2 A7N8X-LA/explorer2 ieee-1394 connectors ieee1394_1 1 tpa2- gnd tpb2- +12v gnd tpa2+ gnd tpb2+ +12v the usb module is purchased separately.
12 asus A7N8X-LA (explorer 2) motherboard 9. front microphone connector (3-pin fp_mic1) this connector is for a chassis-mounted front panel microphone jack. use a 3-pin audio cable to connect the microphone jack to this connector. A7N8X-LA/explorer2 A7N8X-LA/explorer2 front microphone connector fp_mic1 mic power mic input ground 8. front headphone connector (5-pin hjack1) this connector is for a chassis-mounted front panel headphone jack. A7N8X-LA/explorer2 A7N8X-LA/explorer2 front headphone header connector hjack1 analog ground hp-l signal front out-l signal hp-r signal front out-r signal 1
asus A7N8X-LA (explorer 2) motherboard 13 10. digital audio connector (3-pin aspdif1) this connector is for an s/pdif audio module that allows digital instead of analog sound output. connect one end of the audio cable to this connector and the other end to the s/pdif module. A7N8X-LA/explorer2 A7N8X-LA/explorer2 digital audio interface aspdif1 spdifout +5v ground the s/pdif module is purchased separately. 11. tv-out connector (5-pin u46) this connector is for an s/pdif audio module that allows digital instead of analog sound output. connect one end of the audio cable to this connector and the other end to the s/pdif module. A7N8X-LA/explorer2 A7N8X-LA/explorer2 tv out connector 1 tv_out
14 asus A7N8X-LA (explorer 2) motherboard 12. system panel connector (10-1 pin hpanel1) this connector accommodates several system front panel functions. A7N8X-LA/explorer2 A7N8X-LA/explorer2 system panel connector hpanel pled- pwr pled+ ground gnd reset hdled+ hdled- power led reset sw atx power switch* hdled A7N8X-LA/explorer2 system panel connector ? system power led lead (2-pin pled) this 3-1 pin connector connects to the system power led. the led lights up when you turn on the system power, and blinks when the system is in sleep mode. ? hard disk activity led lead (2-pin hdled) this 2-pin connector is for the hdd led cable. the read or write activities of the device connected to the any of ide connectors cause the ide led to light up. ? atx power switch / soft-off switch lead (2-pin pwr) this connector connects a switch that controls the system power. pressing the power switch turns the system between on and sleep, or on and soft off, depending on the bios or os settings. pressing the power switch while in the on mode for more than 4 seconds turns the system off. ? reset switch lead (2-pin reset) this 2-pin connector connects to the case-mounted reset switch for rebooting the system without turning off the system power.

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