BCM ADVANCED RESEARCH, INC. LX400A/P VLB Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/50(internal)/50/66(internal) Chip Set SIS Max. Onboard DRAM 32MB SRAM Cache 64/128/256KB BIOS AMI Dimensions 254mm x 218mm I/O Options 32-bit VESA local bus slot (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Turbo LED J3 Power LED & keylock J7 Turbo switch J4 32-bit VESA local bus S1 slot Speaker J5 32-bit VESA local bus S2 slot Reset switch J6 32-BIT VESA LOCAL BUS SLOT CONFIGURATION CPU Speed JP24 JP25 JP26 JP27 <=33MHz pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed > 33MHz pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Factory configured - do not JP1 open alter » Monitor type select color JP2 closed Monitor type select JP2 open monochrome » Power good signal detect from JP14 pins 1 & 2 power supply closed Power good signal detect from JP14 pins 2 & 3 board closed SRAM CONFIGURATION Size Cache Location TAG 64KB (8) 8K x 8 Banks 0 & 1 (1) 8K x 8 128KB (4) 32K x 8 Bank 0 (1) 8K x 8 256KB (8) 32K x 8 Banks 0 & 1 (2) 32K x 8 SRAM JUMPER CONFIGURATION Size SR1 SR2 SR3 SR4 SR5 64KB pins 2 & pins 2 & pins 1 & pins 1 & pins 1 & 2 3 3 2 2 128KB pins 1 & pins 1 & pins 2 & pins 2 & pins 1 & 2 2 2 3 3 256KB pins 2 & pins 2 & pins 2 & pins 2 & pins 2 & 3 3 3 3 3 Note:Pins designated should be in the closed position. CPU SPEED SELECTION Speed JP10 JP11 JP12 JP13 20MHz pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 25MHz/50(internal) pins 2 & 3 pins 2 & 3 pins 1 & 2 pins 1 & 2 33MHz/66(internal) pins 1 & 2 pins 2 & 3 pins 1 & 2 pins 1 & 2 50MHz pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 Note:Pins designated should be in the closed position. CPU TYPE CONFIGURATION CPU type JP6 JP7 JP8 80486SX open open pins 2 & 3 closed 80487SX closed pins 2 & 3 pins 1 & 2 closed closed 80486DX/DX2 closed pins 1 & 2 pins 1 & 2 closed 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 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9