UNIDENTIFIED VESA X86VLWB Processor 80386DX/80486SX/80486DX/80486DX2 Processor Speed 25/33/40/50(internal)/66(internal)MHz Chip Set Intel Max. Onboard DRAM32MB Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2) NPU Options 80387DX [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Turbo LED JP32 Power LED & keylock J19 32-bit VESA Local SL1, SL2 bus slots Speaker J20 Reset switch SW1 Turbo switch JP31 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS normal operation JP1 pins 2 & 3 closed CMOS memory clear JP1 pins 1 & 2 closed Bus speed select - Clock/5 JP3 Closed Bus speed select - Clock/4 JP3 Open » Monitor type select monochrome JP4 Closed Monitor type select color JP4 Open » Factory configured - do not JP16 Open alter Enable 486SX PQFP JP17 Open Disable 486SX PQFP JP17 Closed Enable 386DX PQFP JP18 Open Disable 386DX PQFP JP18 Closed DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 2MB (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE 5MB (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 1M x 9 (4) 4M x 9 20MB (4) 4M x 9 (4) 1M x 9 32MB (4) 4M x 9 (4) 4M x 9 PROCESSOR TYPE CONFIGURATION Type JP2 JP6 JP7 Cyrix Closed Closed Closed Intel/AMD Open Open Open CPU TYPE CONFIGURATION Type JP5 JP12 80386 pins 2 & 3 closed Closed 80486 pins 1 & 2 closed Open CPU CLOCK CONFIGURATION Type Speed JP25 JP33 80386DX 25MHz pins 2 & 3 pins 1 & 2 closed closed 80386DX 33MHz pins 2 & 3 pins 1 & 2 closed closed 80486SX 25MHz pins 2 & 3 pins 2 & 3 closed closed 80486SX 33MHz pins 2 & 3 pins 2 & 3 closed closed 80486DX 33MHz pins 2 & 3 pins 2 & 3 closed closed 80486DX 50MHz pins 1 & 2 pins 1 & 2 closed closed 80486DX2 50iMHz pins 1 & 2 pins 1 & 2 closed closed 80486DX2 66iMHz pins 2 & 3 pins 2 & 3 closed closed 486 PROCESSOR CONFIGURATION Type JP35 JP36 JP37 80486SX pins 2 & 3 Open pins 2 & 3 closed closed 80486DX pins 1 & 2 Closed pins 1 & 2 closed closed 80486DX2 pins 1 & 2 Closed pins 1 & 2 closed closed CACHE CONFIGURATION Size Bank 0 Bank 1 TAG (U39) TAG (U40) 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 NONE 128KB (4) 32K x 8 NONE (1) 8K x 8 NONE 256KB (4) 32K x 8 (4) 32K x 8 (1) 8K x 8 (1) 8K x 8 CACHE JUMPER CONFIGURATION Size JP10 JP11 JP13 JP15 64KB pins 2 & 3 Open Open Open closed 128KB pins 2 & 3 Closed Closed Open closed 256KB pins 1 & 2 Closed Closed Closed closed VESA CPU TYPE CONFIGURATION CPU Type JP30 JP34 80386 pins 2 & 3 closed pins 1 & 2 closed 80486 pins 1 & 2 closed pins 2 & 3 closed VESA WAIT STATE CONFIGURATION CPU speed Wait states JP22 JP26 < 33MHz 0 wait states Open Open > 33MHz 1 wait states Closed Closed MISCELLANEOUS TECHNICAL NOTES Note:The VESA bus can be disabled by removing two integrated chips (IC) off the system board. To disable the VESA bus, ICs located on U29 and U38 must be removed and the following jumpers must be installed: JP8, JP9, JP14, JP19, JP21, JP23, JP24, JP27. To enable the VESA bus, insert two ICs at U29 and U38. And all jumpers in above paragraph must be open. Some system boards may have a clock generating device which must be set to generate the proper clock speed for the CPU. Jumpers JP28 and JP29 are used to set the clock frequency the device should generate. In most systems, this device is replaced with an oscillator.