UNIDENTIFIED 50/33/25/20MHZ MAINBOARD Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/40/50 (Internal) /50/66 (Internal) Chip Set C & T Max. onboard DRAM 32MB Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock J17 External battery J20 Speaker J18 Turbo switch J21 Reset switch J19 Turbo LED J22 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Monitor type select JP3 Open monochrome Monitor type select color JP3 Closed » CMOS memory normal operation JP5 Pins 1 & 2 closed CMOS memory clear JP5 Pins 2 & 3 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 32MB (4) 4M x 9 (4) 4M x 9 CACHE CONFIGURATION Size Max Cachable Bank 0 Bank 1 TAG 64KB 16MB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB 32MB (4) 32K x 8 NONE (1) 8K x 8 256KB 64MB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP24 JP25 64KB Open Open 128KB Pins 1 & 2 closed Pins 1 & 2 closed 256KB Pins 2 & 3 closed Pins 2 & 3 closed CPU SPEED CONFIGURATION Speed JP21 80486SX/20MHz Pins 5 & 6 closed 80486SX/25MHz Pins 1 & 2, 5 & 6 closed 80486SX/33MHz Pins 1 & 2, 3 & 4 closed 80487SX/20MHz Pins 5 & 6 closed 80486DX/25MHz Pins 1 & 2, 5 & 6 closed 80486DX/33MHz Pins 1 & 2, 3 & 4 closed 80486DX/40MHz Pins 5 & 6 closed 80486DX/50MHz Pins 3 & 4 closed 80486DX2/50i MHz Pins 1 & 2, 5 & 6 closed 80486DX2/66i MHz Pins 1 & 2, 3 & 4 closed CPU TYPE CONFIGURATION TYPE JP9 JP11 JP12 JP13 80486SX/20MHz Pins 2 & 3 Open Pins 2 & 3 Pins 2 & 3 closed closed closed 80486SX/25MHz Pins 1 & 2 Open Pins 2 & 3 Pins 2 & 3 closed closed closed 80486SX/33MHz Pins 1 & 2 Open Pins 2 & 3 Pins 2 & 3 closed closed closed 80487SX/20MHz Pins 2 & 3 Closed Pins 2 & 3 Pins 1 & 2 closed closed closed 80486DX/25MHz Pins 1 & 2 Closed Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX/33MHz Pins 1 & 2 Closed Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX/40MHz Pins 1 & 2 Closed Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX/50MHz Pins 1 & 2 Closed Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX2/50i MHz Pins 1 & 2 Closed Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX2/66i MHz Pins 1 & 2 Closed Pins 1 & 2 Pins 1 & 2 closed closed closed