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Acer 486 - page 1
& K DSWHU System Board System Board 1-1 This high- perform ance, 32- bit personal com puter s y stem is bas ed on the 486 series micr oprocess or. It features the single-chip upgrade technology which allows maxim um ease and flex ibility for upgr ading the system. It is fully compatible with the IBM PC/AT and is suitable for us e as a W ind ...
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Acer 486 - page 2
1-2 User’s Guide 1.1 Sy stem Board Lay out The system board has the following m ajor c omponents : • 486SX, SX2, DX 2, or DX4 series CPU • 4-MB onboard RAM expandable to 36 MB • Two 72-pin SIMM soc kets for m em ory upgrade • 128-KB ROM for system BIOS and VGA BIO S • 120-pin connector for ISA ris er card • Sy stem clock /calendar • ...
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Acer 486 - page 3
System Board 1-3 1. Keyboard contr oller 17. Power daughter board 2. M5105 super I/O controlle r 18. M1429G system chip 3. System and VGA BIO S 19. Onboard memory (4 MB) 4. RTC Battery 20. SIMM sockets 5. Power connector 21. VGA feature connec tor 6. IDE fixed disk c onnector #2* 22. VGA connector 7. IDE fixed disk connector #1 23. Parallel port 8. ...
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Acer 486 - page 4
1-4 User’s Guide 1.2 ESD Precautions Electrostatic discharge ( ESD) can dam age your processor, disk drives , expansion boards, and other com ponents. Always observe the following precautions bef ore you install a sy stem com ponent. 1. Do not remove a com ponent f rom its protective pac kaging until y ou are ready to install it. 2. W ear a w ris ...
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Acer 486 - page 5
System Board 1-5 Do not attempt the procedures described in the following sections unles s y ou are a qualified servic e technician. 1.4 Jumper Settings Figure 1-2 shows the j umper locations. Figure 1-2 Jumper Locations ...
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Acer 486 - page 6
1-6 User’s Guide The f ollowing tables list the jum per settings and their c orreponding functions . Table 1-1 System Board J umpers Jumper Setting Function JP2 1-2 2-3 Enable password check Bypass passw ord JP14 Closed Open Enable onboard VGA Disable onboard VGA JP16 Open Closed Enable onboard local bus IDE Disable onboard local bus IDE JP21 Clo ...
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Acer 486 - page 7
System Board 1-7 Table 1-3 CPU Type Selection 486 1 486 WB 2 Pentiu m OverDrive AMD 486/DX2 AM D 486/DX4 Cyrix IBM TI JP11 1-2 1-2 1-2 1-2 1-2 2-3 2-3 JP12 1-2 2-3 2-3 1-2 1-2 1-2 2-3 JP13 1-2 1-2 1-2 1-2 1-2 1-2 2-3 JP18 2-3 1-2 1-2 2-3 2-3 2-3 2-3 JP20 2-3 2-3 2-3 2-3 2-3 1-2 2-3 JP30-32 Open Open Open Open Open Closed Open JP33 1-2 1-2 1-2 1-2 1 ...
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Acer 486 - page 8
1-8 User’s Guide 1.5 Installing Memory The system board has two 72-pin SIMM sock ets that accept 1-MB, 2- MB, 4-MB, 8-MB, or 16-MB mem ory modules with 80 ns (or less) DRAM speed. The m axim um system m em ory size is 36 MB. W hen installing additional m emor y , choose one of the SIMM configur ations listed in T able 1-5. Table 1-5 Memory Config ...
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Acer 486 - page 9
System Board 1-9 1.5.1 Installing a SIMM Observ e ESD precautions when installing SIMMs. See section 1.2. Follow these steps to install a SIMM: 1. Insert the SIMM into the soc k et at a slight angle, m ak ing sur e that the cut edge of the SIMM touc hes the base of the circle m ark on the SIMM sock et. 2. Gently press the SIMM back against the hold ...
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Acer 486 - page 10
1-10 User’s Guide 1.5.2 Removing a SIM M Observ e ESD precautions when removing SIMMs. See section 1.2. 1. Press the holding clips on both s ides of the SIMM outward to release it. 2. Push the SIMM upward. 3. Gently pull the SIMM out of the sock et. Figure 1-4 Removing a SIMM 1.5.3 Reconfiguring the Sy stem The system autom atically detects the a ...
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Acer 486 - page 11
System Board 1-11 1.6 Upgradi ng the CPU Conventional technology places the CPU on the sam e board as the ISA bus logic, sy s tem mem ory and I/O interfac e. The entire s y stem board m ust be replaced to upgr ade the CPU. Single-c hip upgrade technology gives you the flexibility to upgrade the CPU by simply inserting a new CPU without replacing th ...
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Acer 486 - page 12
1-12 User’s Guide 4. Insert the upgrade CPU (with the heatsink ) into the upgrade sock et. Mak e sur e that pin 1 of the CPU c orr esponds to hole 1 of the upgrade socket (see Figure 1-6). T he flat corner on the CPU indicates pin 1. Inser t the CPU pins into the s ock et pinholes gently but firm ly. Be careful not to bend any pins. Figure 1-5 Pi ...
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Acer 486 - page 13
System Board 1-13 1.7 Pow er Daughter Boar d The power daughter board enables the system to suppor t a 3.3V mic roprocess or. W ithout this board, your sy stem can only support a 5V CPU. Follow these steps to install the power daughter board: Before installing, you mus t chec k firs t the voltage requirement of y our upgrade CPU. 1. Locate the powe ...
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Acer 486 - page 14
1-14 User’s Guide 1.8 Upgradi ng VGA Memory Observ e ESD precautions when installing components. See sec tion 1.2. The VGA m em ory is upgradable to 1 or 2 MB depending on your onboard VGA chip. T he system board m ay come with either a GD- 5424 or a GD-5429 VG A chip. If y our board has a GD-5424, then your VGA mem ory is expandable to 1 MB only ...
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Acer 486 - page 15
System Board 1-15 U12 U13 U15 U16 U9 U10 514260 DRAM 44256 DRAM Figure 1-7 Installing VGA RAM You do not need to change any jumper settings when upgrading the VGA memory . ...
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Acer 486 - page 16
1-16 User’s Guide 1.9 Upgradi ng Cache M emory To ins tall cache c hips, do the following: 1. Locate the cache s ock ets on the system board. See Figur e 1-1. 2. Align the cut edge of the chip with the cut edge of the cache sock ets. See Figure 1-8. TAG U56 U57 U58 U59 U60 U61 U62 U63 Figure 1-8 Installing Cache 3. Gently but firmly insert a 32 K ...
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Acer 486 - page 17
System Board 1-17 The SRAM must have an acces s speed of 15 nanoseconds. Make sure that you set the jumpers proper ly. See section 1.4. 1.10 Post-installation Instructions Alway s observe the f ollowing: 1. See to it that the components are installed according to the step- by -step instructions in their respec tive sections . 2. Make sure you have ...
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Acer 486 - page 18
1-18 User’s Guide 1.11 Pow er-M anagement Feature The m ainboard incor porates the lates t power-c ons ervation tec hnology. However, to take advantage of its energy-saving capabilities , the mainboar d mus t have an Intel SL-Enhanced or a power-s aving CPU. The Power-Managem ent feature allows y ou to monitor s y stem activity. Sy stem activity ...
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Acer 486 - page 19
System Board 1-19 Set the independent power-m anagement tim ers for the VESA DPMS monitor . Valid values are from 1 to 15 m inutes. Any video or I/O action returns the system to full power. IDE F I XED DI SK STANDBY MODE The IDE Fixed Disk Standby Mode offers a quic k-r esum e power- saving mode for ATA-c om pliant IDE fixed disk s. It is allows te ...
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Acer 486 - page 20
1-20 User’s Guide Set the Suspend Mode timer to a value f rom 2 to 120 minutes , or activate the Suspend/Resum e button. In Suspend m ode, the turbo LED light on the front panel blinks at a rate slower than when the system is in the Standby m ode. Activating the Sus pend/Resum e button produces two beeps as the system enter s the suspend mode. An ...
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Acer 486 - page 21
System Board 1-21 1.12 Ad vanced Power M anagement (A PM) This system f eatures the APM s tandard designed to f urther reduce system power consum ption. APM is a power-m anagement approach developed jointly by Micros oft and Intel. An increasing num ber of software applications support APM to tak e advantage of the power- saving featur es and off e ...
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Acer 486 - page 22
1-22 User’s Guide 1.14 VESA DPMS The Video Electronics Standard Association (VESA) proposed the Display Power-Management Signaling (DPMS) standard com binations of horizontal and vertical s ynchronization signals for the PC-VGA monitor . Its purpose is to com ply wi th the U.S. Environm ental Protection Agency (EPA) require ments . Table 1-8 lis ...
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Acer 486 - page 23
System Board 1-23 1.15 Error M essages In the event that y ou receive an err or message, do not continue using the com puter. Note the m essage and tak e cor rective action at once. This s ection desc ribes the diff erent types of err or m essages and suggests c orrective m easur es. There ar e two general ty pes of err or m essages: • Software ? ...
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Acer 486 - page 24
1-24 User’s Guide Table 1-9 System Err or Messages Error Message Corrective A ction Bad CMO S Battery Replace battery . Contact your dealer. CM OS Checksum Error Run Setup. Diskette Dri ve Controller Error Check and connect the cable to the diskette drive or controller. Diskette Drive Error Diskette may be bad. If not, check the diskette drive an ...
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Acer 486 - page 25
System Board 1-25 Table 1-9 System Err or Messages (c ontinued) Error Message Corrective Action Memory Error Check SIMM s on the system board. Contact your dealer. Memory Siz e Mismatch Run Setup. Serial 1 Conflict Run Setup. Disable onboard serial 1. Serial 2 Conflict Run Setup. Disable onboard serial 2. Parallel Conflict Run Setup. Disable onboar ...
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Acer 486 - page 26
1-26 User’s Guide 1.15.3 Correcting Error Conditions As a general rule, the "Press F1 to continue" er ror m essage is c aused by a configur ation problem which can be eas ily corrected. An equipment m alf unction is m ore lik ely to cause a f atal err or, i.e., an error that caus es com plete system f ailure. Here are som e cor rective ...
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