I-BUS BARRACUDA Processor CX486SX/80486SX/80486SX2/CX486DX/AM486DX/SL80486DX/80486DX/ CX486DX2/AM486DX2/SL80486DX2/80486DX2/80486DX4/P24D/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Speed Chip Set OPTI Max. 128MB Onboard DRAM Cache 64/128/256/512KB BIOS Unidentified Dimensions 300mm x 89mm I/O Floppy drive interface, IDE interface, parallel port, PS/2 mouse Options port, serial ports (2) NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location IDE interface J3 Serial port 1 J30 Parallel port J4 Serial port 2 J31 Speaker J6 Auxiliary keyboard J32 connector Chassis fan power J8 Floppy drive J33 interface IDE interface LED J25 PS/2 mouse interface J35 Reset switch J26 USER CONFIGURABLE SETTINGS Function Jumper Position PCI type select synchronous J9 pins 2 & 4, 3 & 5 closed PCI type select asynchronous J9 pins 1 & 3, 4 & 6 closed » Primary IDE enabled J14 pins 1 & 3 closed Primary IDE disabled J14 pins 1 & 3 open Secondary IDE enabled J14 pins 3 & 5 closed Secondary IDE disabled J14 pins 3 & 5 open » IDE interface enabled J14 pins 2 & 4 closed IDE interface disabled J14 pins 4 & 6 closed » Floppy drive type select 1.44MB J17 pins 1 & 2 closed Floppy drive type select 2.88MB J17 pins 3 & 4, 5 & 6 closed » CPU clock frequency select 8MHz J19 pins 1 & 2 closed CPU clock frequency select 16MHz J19 pins 2 & 3 (DX4 only) closed PCI adapters not installed J20 pins 1 & 2 closed PCI adapters installed J20 pins 2 & 3 closed IDE read prefetch enabled J22 pins 1 & 2 closed IDE read prefetch disabled J22 pins 2 & 3 closed » Battery type select internal J24 pins 2 & 3 closed CMOS memory clear J24 pins 1 & 2 closed » Mouse IRQ12 enabled J27 Closed Mouse IRQ12 disabled J27 Open » IDE IRQ14 enabled J28 Closed IDE IRQ14 disabled J28 Open » Factory configured - do not alter J29 N/A Password enabled J36 Closed Password disabled J36 Open DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 2MB (1) 512K x NONE NONE NONE 36 4MB (1) 512K x (1) 512K x NONE NONE 36 36 4MB (1) 1M x 36 NONE NONE NONE 8MB (1) 2M x 36 NONE NONE NONE 8MB (1) 512K x (1) 512K x (1) 512K x (1) 512K x 36 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 10MB (1) 2M x 36 (1) 512K x NONE NONE 36 10MB (1) 512K x (1) 2M x 36 NONE NONE 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 14MB (1) 2M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 16MB (1) 4M x 36 NONE NONE NONE 16MB (1) 2M x 36 (1) 2M x 36 NONE NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 18MB (1) 4M x 36 (1) 512K x NONE NONE 36 18MB (1) 512K x (1) 2M x 36 (1) 2M x 36 NONE 36 20MB (1) 4M x 36 (1) 1M x 36 NONE NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 20MB (1) 1M x 36 (1) 4M x 36 NONE NONE 22MB (1) 4M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 NONE 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 NONE 26MB (1) 512K x (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 36 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 32MB (1) 8M x 36 NONE NONE NONE 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 34MB (1) 8M x 36 (1) 512K x NONE NONE 36 34MB (1) 512K x (1) 8M x 36 NONE NONE 36 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 NONE 38MB (1) 8M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 40MB (1) 8M x 36 (1) 2M x 36 NONE NONE 40MB (1) 2M x 36 (1) 8M x 36 NONE NONE 48MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 NONE 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 52MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 66MB (1) 512K x (1) 8M x 36 (1) 8M x 36 NONE 36 72MB (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 NONE 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 NONE 98MB (1) 512K x (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 36 104MB (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 64KB (4) 8K x 8 (4) 8K x 8 128KB (4) 32K x 8 NONE 256KB (4) 32K x 8 (4) 32K x 8 512KB (4) 64K x 8 (4) 64K x 8 Note: Cache is factory installed by the manufacturer and is not configurable. CACHE JUMPER CONFIGURATION Size J15 64KB Open 128KB pins 5 & 6 closed 256KB pins 3 & 4, 5 & 6 closed 512KB pins 1 & 2, 3 & 4, 5 & 6 closed CACHE JUMPER CONFIGURATION Setting J21 Bank 0 installed pins 1 & 2 closed Banks 0 & 1 installed pins 2 & 3 closed CPU TYPE CONFIGURATION Type J5 80486SX pins 2 & 3 closed 80486DX pins 1 & 2, 3 & 4 closed CPU TYPE CONFIGURATION Type J7 J23 AMD Open pins 1 & 2 closed Cyrix pins 1 & 2, 3 & 4 pins 2 & 3 closed closed Intel Open pins 1 & 2 closed CPU TYPE CONFIGURATION Type J1 80486SL-series pins 1 & 2, 3 & 4 closed P24T burst write pins 5 & 6 closed P24T write back pins 7 & 8 closed P24T write through Open CPU TYPE CONFIGURATION Type J18 80486SL-series pins 2 & 4 closed Cyrix pins 4 & 6 closed P24D write back pins 3 & 5 closed P24D write through pins 1 & 3 closed CPU TYPE CONFIGURATION Type J11 Any CPU type installed except for pins 1 & 3 closed P24T Pentium Overdrive pins 3 & 5 closed Bit 0 to stop clock pins 2 & 4 closed Bit 0 to stop clock pins 4 & 6 closed CPU SPEED CONFIGURATION Speed J12 J16 25MHz pins 1 & 3, 2 & 4 pins 5 & 6 closed closed 33MHz pins 1 & 3, 4 & 6 pins 1 & 2, 5 & 6 closed closed 40MHz pins 2 & 4, 3 & 5 pins 3 & 4, 5 & 6 closed closed 50iMHz pins 1 & 3, 2 & 4 pins 5 & 6 closed closed 50MHz pins 4 & 6, 3 & 5 pins 1 & 2, 3 & 4, 5 & closed 6 closed 66iMHz pins 1 & 3, 4 & 6 pins 1 & 2, 5 & 6 closed closed 75iMHz pins 1 & 3, 2 & 4 pins 5 & 6 closed closed 100iMHz pins 1 & 3, 4 & 6 pins 1 & 2, 5 & 6 closed closed CPU SPEED CONFIGURATION (80486DX4) Speed J10 2x pins 3 & 5 closed 2.5x pins 1 & 3 closed 3x Open Cyrix CPU installed pins 3 & 4 closed IDE MODE CONFIGURATION Speed J13 >180ns pins 1 & 3, 2 & 4 closed >240ns pins 2 & 4, 3 & 5 closed >383ns pins 1 & 3, 4 & 6 closed >480ns pins 3 & 5, 4 & 6 closed DMA CONFIGURATION DMA J2 DMA 1 pins 3 & 4, 5 & 6 closed DMA 3 pins 1 & 2, 7 & 8 closed