COMPUTREND SYSTEMS, INC. CONTAQ SINGLE CHIP 486 (MS-4125) 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 260mm 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 - Reset switch J5 pins 19 & 5 20 Speaker J5 pins 7 - 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 CPU SPEED CONFIGURATION Speed JP12 JP13 JP14 25MHz Open Open Closed 33MHz Closed Open Open 40MHz Closed Closed Open 50iMHz Open Open Closed 50MHz Open Closed Open 66iMHz Closed Open Open CPU CLOCK SPEED CONFIGURATION Speed JP8 20MHz pins 2 & 3 closed 25MHz pins 2 & 3 closed 33MHz pins 1 & 2 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 CONFIGURATION Type JP18 JP22 Normal card installed Closed pins 1 & 2 closed Weitek P9000 only Open pins 2 & 3 closed