INTEL CORPORATION R486SX254F/R486SX33F/R486DX334F/R486DX2664F Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive Processor 25/33/50(internal)/66(internal)MHz Speed Chip Set VLSI Max. Onboard 32MB DRAM Cache 64/128/256KB BIOS Phoenix Dimensions 330mm x 218mm I/O Options 32-bit proprietary riser card slot, floppy drive interface,IDE interface, parallel port, PS/2 mouse port,serial ports (2), VGA feature connector, VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location VGA port J1 Floppy drive J15 interface Parallel port J2 +5V auxiliary fan J26 power Serial port 2 J3 IDE interface LED J29 Serial port 1 J4 Power LED & J30 Keylock PS/2 mouse port J5 Reset switch J31 32 Bit proprietary J7 +12V auxiliary fan J32 riser card power VGA feature J10 External speaker J33 connector IDE interface J14 Note:To connect an external speaker, remove the jumper from pins 3 & 4 and connect external speaker between pins 1 & 4. USER CONFIGURABLE SETTINGS Function Jumper Position » FLASH BIOS programming enabled J12 pins 1 & 2 closed FLASH BIOS programming disabled J12 pins 2 & 3 closed » Normal FLASH operation J13 pins 1 & 2 closed Invoke boot block recovery J13 pins 2 & 3 closed » Enable onboard video J16 pins 1 & 2 closed Disable onboard video J16 pins 2 & 3 closed » Disable floppy drive write J17 pins 2 & 3 protect closed Enable floppy drive write protect J17 pins 1 & 2 closed » Enable password J20 pins 2 & 3 closed Disable password J20 pins 1 & 2 closed » Enable user to enter Setup J21 pins 1 & 2 closed Prevent user to enter Setup J21 pins 2 & 3 closed » CMOS normal operation J28 Closed CMOS clear upon power-up J28 Open DRAM CONFIGURATION Size Bank 0 Bank 1 2MB (1) 512K x 36 NONE 4MB (1) 512K x 36 (1) 512K x 36 4MB (1) 1M x 36 NONE 6MB (1) 512K x 36 (1) 1M x 36 6MB (1) 1M x 36 (1) 512K x 36 8MB (1) 1M x 36 (1) 1M x 36 8MB (1) 2M x 36 NONE 10MB (1) 2M x 36 (1) 512K x 36 10MB (1) 512K x 36 (1) 2M x 36 12MB (1) 2M x 36 (1) 1M x 36 16MB (1) 1M x 36 (1) 2M x 36 16MB (1) 2M x 36 (1) 2M x 36 16MB (1) 4M x 36 NONE 18MB (1) 512K x 36 (1) 4M x 36 18MB (1) 4M x 36 (1) 512K x 36 20MB (1) 1M x 36 (1) 4M x 36 20MB (1) 4M x 36 (1) 1M x 36 24MB (1) 2M x 36 (1) 4M x 36 24MB (1) 4M x 36 (1) 2M x 36 32MB (1) 4M x 36 (1) 4M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 32K x 8 128KB (4) 32K x 8 NONE (1) 32K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size J11 64KB Open 128KB pins 1 & 2, 5 & 6 closed 256KB pins 1 & 2, 3 & 4, 7 & 8 closed CPU TYPE CONFIGURATION CPU Type J22 J23 J24 J25 80486SX pins 1 & 2 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed 80487SX pins 2 & 3 pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed closed 80486DX pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed closed 80486DX2 pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed closed ODP486SX pins 2 & 3 pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed closed CPU SPEED CONFIGURATION CPU Speed J18 J19 25MHz pins 1 & 2 closed pins 1 & 2 closed 33MHz pins 1 & 2 closed pins 2 & 3 closed 50iMHz pins 1 & 2 closed pins 1 & 2 closed 66iMHz pins 1 & 2 closed pins 2 & 3 closed VRAM CONFIGURATION Size Bank 0 Bank 1 512K (4) 256 x 4 NONE 1MB (4) 256 x 4 (4) 256 x 4