This document is for the full-sized (13.3" x 12.025") 80486DX-33, 80486DX2-50, and 80486DX2-66 EISA motherboard. The part number for this board is 09-00173-xx. It's identifying features are: an LED between expansion slots #5 and #6; eight 32-bit EISA expansion slots; 4 sockets for SIMMs (four banks). The EISA Slots are numbered 1, 7, 8, 2, 3, 4, 5, & 6. EISA Slots 7,8 are VESA Slots which support Bus mastering VESA SCSI controllers only. EISA slots 1 to 6 support EISA Bus mastering controllers. The Bus clock speed EISA standard is fixed at 8.3MHz. +=============================+ + + + MOTHERBOARD SWITCH SETTINGS + + + + * Default setting + +=============================+ 1 Memory size (see below) 2 Memory size (see below) 3 Memory size (see below) 4 Memory size (see below) 5 Memory size (see below) 6 CPU Speed 33Mhz On / 25Mhz Off 7 CPU Speed 33MHZ Off / 25Mhz Off 8 Color video adapter *On Mono video adapter Off DIP switch settings for memory size =================================== Memory Banks DIP Switch 2 --------------------------------------------------- MB 0 1 2 3 S1 S2 S3 S4 S5 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1MB 256K ON ON ON ON ON 2MB 256K 256K OFF ON ON ON ON 3MB 256K 256K 256K ON OFF ON ON ON 4MB 256K 256K 256K 256K OFF OFF ON ON ON 4MB 1MB ON ON OFF ON ON 5MB 256K 1MB ON ON OFF OFF ON 6MB 256K 256K 1MB ON OFF ON OFF ON 7MB 256K 256K 256K 1MB OFF ON ON OFF ON 8MB 1MB 1MB OFF ON OFF ON ON 9MB 256K 1MB 1MB ON OFF OFF OFF ON 10MB 256K 256K 1MB 1MB OFF OFF ON OFF ON 12MB 1MB 1MB 1MB ON OFF OFF ON ON 13MB 256K 1MB 1MB 1MB OFF OFF OFF OFF ON 16MB 1MB 1MB 1MB 1MB OFF OFF OFF ON ON 16MB 4MB ON ON OFF ON OFF 20MB 1MB 4MB ON ON OFF OFF OFF 24MB 1MB 1MB 4MB ON OFF ON OFF OFF 28MB 1MB 1MB 1MB 4MB OFF ON ON OFF OFF 32MB 4MB 4MB OFF ON OFF ON OFF 36MB 1MB 4MB 4MB ON OFF OFF OFF OFF 40MB 1MB 1MB 4MB 4MB OFF OFF ON OFF OFF 48MB 4MB 4MB 4MB ON OFF OFF ON OFF 52MB 1MB 4MB 4MB 4MB OFF OFF OFF OFF OFF 64MB 4MB 4MB 4MB 4MB OFF OFF OFF ON OFF In the table above, 256K indicates that (1) 256Kx36 SIMM is installed in the bank, 1MB indicates that (1) 1Mx36 SIMM is installed in the bank, and 4MB indicates that 4Mx36 SIMM is installed in the bank. The above shows all of the possible memory configurations. When installing more than 16MB of memory, BIOS relocation must be disabled. Bios relocation copies the video Bios (C0000-C7FFF) and the system ROM Bios (F0000-FFFFF) into RAM. The motherboard adds 15MB to these addresses (F00000) to be able to differentiate between the ROM and RAM. Enabling the relocation feature causes the memory above 16MB to become non-contiguous and therefore inaccessible. Micronics Computers has tested and verified the following memory brands: Toshiba, Siemens, Mitsubishi, NEC +=============================+ + + + MOTHERBOARD JUMPER SETTINGS + + + +=============================+ J1 Keyboard connector Pin 1 - Keyboard clock Pin 2 - Keyboard data Pin 3 - no connector Pin 4 - Ground Pin 5 - +5 volts DC J17 External 6-volt battery connector Pin 1 - Battery Positive Pin 2 - no connector Pin 3 - Ground Pin 4 - Ground J22 External speaker Pin 1 - Speaker Pin 2 - no connector Pin 3 - Ground Pin 4 - +5 volts DC J23 Keylock / Power LED Pin 1 - Power LED signal Pin 2 - no connector Pin 3 - Ground Pin 4 - Keyboard lock signal Pin 5 - Ground W5 Reset switch Pin 1 - Signal Pin 2 - Ground W6 Turbo switch Pin 1 - Signal Pin 2 - Ground W7 Turbo LED Pin 1 - Signal Pin 2 - Ground J62 Floppy Controller IRQ 6, DMA CH 2, I/O 3F0-3F7H {AUTO DISABLE} J30 IDE Interface IRQ 14, I/O 1F0-1F7h {AUTO DISABLE} W36 IDE Hard Drive LED 1 - Signal 2 - GND 3 - GND 4 - Signal J63 Serial A 16450 UART IRQ 4 COM 1 or COM3 J64 Serial B 16450 UART IRQ 3 COM 2 or COM4 { A 16550 UART is present only if the Super I/O Chip is National PC87312 } J16 Parallel Port connector IRQ 7, @3BCh or @378h W16 Printer Port mode Pin 2-3 - Output Mode Pin 1-2 - Input Mode {scanner} CPU Clock Speed W54 W55 SW2 #6 SW2 #7 25Mhz ON ON OFF OFF 33Mhz ON OFF ON OFF PQFP i486SX ZIF Socket W50 W66 W67 Surface Mounted None i486SX 1-2 2-3 3-4 None i486DX /DX2 2-3 1-2 & 3-4 1-2 i486SX None 1-2 2-3 3-4 i486SX i487SX 1-2 1-2 & 3-4 3-4 i486SX i486DX /DX2 2-3 1-2 & 3-4 1-2 i486SX OverDRIVE 1-2 1-2 & 3-4 2-3 W68 When Local Bus Master Controllers are installed {VL SCSI}, jumper W68 must be placed on Pins 1-2 to support local bus DMA. Default 2-3 W69 Write protect Flash BIOS programing : W69 - open Update Flash BIOS Programming : W69 - installed W65 BIOS Recovery {DO NOT MOVE ! Removing this jumper will erase the BIOS !} Cache configuration Direct Mapped Write Through ============================ Cache W20 W21 W52 W44 ---------------------------- 64K N/C N/C N/C 2-3 256K 1-2 1-2 1-2 1-2 N/C = Not Connected