UNIDENTIFIED 486-EL Processor 80486SX/80486DX/80486DX2/80486DX4 Processor 25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz Speed Chip Set OPTI Max. Onboard 16MB DRAM Cache 8KB (on EDRAM modules) BIOS AMI Dimensions 250mm x 220mm I/O Options 32-bit VESA local bus slots (3), green PC connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery JP2 Reset switch JP27 Green PC connector JP3 Power LED & keylock JP28 Turbo LED JP25 Speaker JP30 Turbo switch JP26 32-bit VESA local SL1 - SL3 bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP1 pins 2 & 3 closed CMOS memory clear JP1 pins 1 & 2 closed Green PC IRQ select IRQ10 JP23 pins 1 & 2 closed Green PC IRQ select IRQ11 JP23 pins 2 & 3 closed Green PC timer select short time JP29 Closed (1.5 minutes) Green PC timer select long time JP29 Open (8 minutes) DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 4MB 4MB NONE NONE NONE 8MB 4MB 4MB NONE NONE 8MB 8MB NONE NONE NONE 12MB 4MB 4MB 4MB NONE 16MB 4MB 4MB 4MB 4MB 16MB 8MB NONE 8MB NONE Note: This board is only compatible with EDRAM modules. CACHE CONFIGURATION Memory installed Cache installed 4MB 2KB 8MB 4KB 8MB 4KB 12MB 6KB 16MB 8KB 16MB 8KB Note: Cache is located on EDRAM modules. CPU TYPE CONFIGURATION Type JP19 JP20 JP21 80486SX Open pins 1 & 2 pins 1 & 2 closed closed 80486DX Closed pins 2 & 3 pins 2 & 3 closed closed 80486DX2 Closed pins 2 & 3 pins 2 & 3 closed closed 80486DX4 Closed pins 2 & 3 pins 2 & 3 closed closed CPU SPEED CONFIGURATION Speed JP9 JP10 JP36 25MHz Open Closed pins 1 & 2 closed 33MHz Closed Open pins 1 & 2 closed 50iMHz Open Closed pins 1 & 2 closed 66iMHz Closed Open pins 1 & 2 closed 75iMHz Open Closed pins 2 & 3 closed 100iMHz Closed Open pins 1 & 2 closed CPU SPEED CONFIGURATION (80486DX4 ONLY) Speed JP35 2x pins 1 & 2 closed 2.5x pins 2 & 3 closed 3x Open