UNIDENTIFIED MS-4125 VERSION 2.1 Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set Contaq Max. Onboard 32MB DRAM Cache 64/128/256KB BIOS AMI Dimensions 254mm x 220mm I/O Options 32-bit VESA local bus slots (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Auxiliary keyboard J2 Turbo LED J5 pins 12 - connector 13 External battery J4 Turbo switch J5 pins 15 - 17 Power LED & keylock J5 pins 1 - 5 Reset switch J5 pins 19 - 20 Speaker J5 pins 6 - 32-bit VESA SL1 & SL2 10 local bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » Battery type select internal J4 pins 2 & 3 closed Battery type select external J4 Closed » Monitor type select monochrome JP17 Open Monitor type select color JP17 Closed » Factory configured - do not JP23 pins 1 & 2 alter closed » Factory configured - do not JP26 pins 1 & 2 alter closed » Factory configured - do not JP37 pins 1 & 2 alter 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 5MB (4) 1M x 9 (4) 256K x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 17MB (4) 4M x 9 (4) 256K x 9 17MB (4) 256K x 9 (4) 4M x 9 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 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP1 JP6 JP7 64KB pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed 128KB pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed 256KB pins 4 & 5 pins 1 & 2 pins 1 & 2 closed closed closed CPU TYPE CONFIGURATION Type JP31 JP32 JP33 80486SX (PQFP) Open Open pins 1 & 2 closed 80486SX (PGA) pins 3 & 4 Open pins 2 & 3, 4 & closed 5 closed ODP486SX pins 2 & 3, 4 & pins 1 & 2 pins 2 & 3, 4 & 5 closed closed 5 closed 80487SX pins 2 & 3, 4 & pins 1 & 2 pins 2 & 3, 4 & 5 closed closed 5 closed 80486DX (PQFP) pins 1 & 2 pins 4 & 5 pins 1 & 2 closed closed closed 80486DX (PGA) pins 2 & 3, 4 & pins 2 & 3 pins 2 & 3, 4 & 5 closed closed 5 closed 80486DX2 pins 2 & 3, 4 & pins 2 & 3 pins 2 & 3, 4 & 5 closed closed 5 closed Pentium Overdrive pins 2 & 3, 4 & pins 1 & 2 pins 2 & 3, 4 & 5 closed closed 5 closed Note: Depending on board revision, it will have either a PGA or PQFP socket. CPU SPEED CONFIGURATION Speed JP8 JP12 JP13 JP14 25MHz pins 2 & 3 Open Open Closed closed 33MHz pins 1 & 2 Closed Open Open closed 40MHz pins 1 & 2 Closed Closed Open closed 50iMHz pins 2 & 3 Open Open Closed closed 50MHz pins 1 & 2 Open Closed Open closed 66iMHz pins 1 & 2 Closed Open Open closed VESA WAIT STATE CONFIGURATION Wait states JP19 0 wait states Open 1 wait state Closed BUS SPEED CONFIGURATION CPU speed JP20 <= 33MHz Open > 33MHz Closed VESA CARD TYPE CONFIGURATION Card type JP18 JP22 Normal Closed pins 1 & 2 closed Weitek P9000 Open pins 2 & 3 closed