AMERICAN MEGATRENDS, INC. Omni Business Partner Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive Processor 20/25/33/50(internal)/66(internal)MHz Speed Chip Set AMI Max. Onboard 20MB DRAM Cache 256KB BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location IDE interface J2 RJ48 10BaseT J35 connector Onboard battery J5 SCSI LED J37 PS/2 mouse connector J6 Speaker J38 External battery J8 Reset switch J39 Serial port 2 J11 Turbo switch J40 Secondary cache J12 BNC 10Base2 connector J41 connector SCSI connector J15 IDE interface LED J42 (internal) Serial port 1 J16 Turbo LED J43 SCSI 1 J17 Keyboard lock J44 connector VGA port J31 Parallel port P3 AUI connector J32 Floppy drive P4 interface USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » PowerGood signal from DS1231 J1 Open PowerGood signal not from J1 Closed DS1231 (not installed) » Factory configured do not J3 N/A alter » Flash ROM programming J7 Open disabled Flash ROM programming J7 Closed enabled » Factory configured do not J20 Closed alter » Video memory DRAM cycle J21 Open select (6 MCLK RAS) Video memory DRAM cycle J21 Closed select (7 MCLK RAS) » VGA controller IRQ NOT J22 Open routed to IRQ9 VGA controller IRQ routed to J22 Closed IRQ9 » Enables IRQ12 for onboard J27 pins 2 & 3 PS/2 mouse closed Disables IRQ12 for onboard J27 pins 1 & 2 PS/2 mouse closed » Enables IRQ10 for NCR SCSI J28 Closed I/O processor Disables IRQ10 for NCR SCSI J28 Open I/O processor » Enables IRQ11 for onboard J29 Closed LAN controller Disables IRQ11 for onboard J29 Open LAN controller » VGA onboard controller J33 Closed enabled VGA onboard controller J33 Open disabled » CMOS memory normal operation J34 pins 2 & 3 closed CMOS memory clear J34 pins 1 & 2 closed » Onboard SCSI termination J36 pins 2 & 3 chip enabled closed Onboard SCSI termination J36 pins 1 & 2 chip disabled closed » Factory configured do not SW1/1 Off alter » Monitor type select SW1/2 Off monochrome Monitor type select color SW1/2 On 64KB Cache enabled SW2/1, 2, 3, 4 Off 256KB Cache enabled SW2/1, 2, 3, 4 On SERIAL PORT IRQ CONFIGURATION Port 1 (J16) Port 2 (J11) J25 J26 » IRQ4 IRQ3 pins 1 & 2 pins 1 & 2 closed closed IRQ3 IRQ4 pins 2 & 3 pins 2 & 3 closed closed CPU FREQUENCY CONFIGURATION Frequency J9 J10 » 33 Mhz Open Open 25 MHz Closed Open CPU TYPE CONFIGURATION CPU Type J13 J14 80486SX pins 1 & 2 closed pins 2 & 3 closed 80487SX pins 2 & 3 closed all closed 80486DX pins 1 & 2 closed all closed ODP486SX pins 2 & 3 closed all closed 80486DX2 pins 1 & 2 closed all closed Pentium Overdrive pins 2 & 3 closed all closed MEMORY CLOCK SPEED OF THE CLGD5426 Frequency J23 J24 50.11 MHz Closed Closed 44.74 MHz Closed Open 41.16 MHz Open Closed 37.58 MHz Open Open DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 36 2MB (1) 256K x (1) 256K x NONE NONE 36 36 4MB (1) 1M x 36 NONE NONE NONE 6MB (1) 256K x (1) 256K x (1) 1M x 36 NONE 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 10MB (1) 256K x (1) 256K x (1) 1M x 36 (1) 256K x 36 36 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 4M x 36 NONE NONE NONE 20MB (1) 1M x 36 (1) 4M x 36 NONE NONE 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 NONE 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 NONE 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36