INTEL CORPORATION CLASSIC R Processor 80486SX/80486DX/80486DX2 Processor Speed 25/33/50(internal)/66(internal)MHz Chip Set VLSI Max. Onboard DRAM 32MB Cache 64/128/256KB BIOS Phoenix Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VESA feature connector, VGA port, riser slot NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location VGA port J1 Chassis fan power J26 Parallel port J2 IDE interface LED J29 Serial port 2 J3 Power LED & keylock J30 Serial port 1 J4 Reset switch J31 PS/2 mouse port J5 Chassis fan power J32 VESA feature connector J10 Speaker J33 IDE interface J14 Riser slot SL1 Floppy drive interface J15 USER CONFIGURABLE SETTINGS Function Jumper Position » 12v to flash BIOS enabled J12 pins 1 & 2 closed 12v to flash BIOS disabled J12 pins 2 & 3 closed » Flash BIOS recovery mode J13 pins 1 & 2 disabled closed Flash BIOS recovery mode enabled J13 pins 2 & 3 closed » On board video enabled J16 pins 1 & 2 closed On board video disabled J16 pins 2 & 3 closed » Floppy drive write protect J17 pins 2 & 3 enabled closed Floppy drive write protect J17 pins 1 & 2 disabled closed » Password enabled J20 pins 2 & 3 closed Password clear J20 pins 1 & 2 closed » CMOS access enabled J21 pins 1 & 2 closed CMOS access disabled J21 pins 2 & 3 closed » CMOS memory normal operation J28 Closed CMOS memory clear J28 Open Note: The location of the above jumpers are unidentified. 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) 512K x 36 (1) 2M x 36 10MB (1) 2M x 36 (1) 512K x 36 12MB (1) 1M x 36 (1) 2M x 36 12MB (1) 2M x 36 (1) 1M 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) 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 Note: The orientation of Banks 0 & 1 and TAG is unidentified. CACHE JUMPER CONFIGURATION Size J11 pins 1 & J11 pins 3 & J11 pins 5 & J11 pins 7 & 2 4 6 8 64KB Open Open Open Open 128KB Closed Open Closed Open 256KB Closed Closed Open Closed Note: The location of J11 is unidentified. CPU TYPE CONFIGURATION Type J22 J23 j24 j25 80486SX pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 (PQFP) closed closed closed closed 80486SX pins 1 & 2 pins 2 & 3 pins 2 & 3 pins 2 & 3 (PGA) closed closed closed closed 80486DX pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed 80486DX2 pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed Note: The locations of J22, J23, J24 & J25 are unidentified. The location of the PQFP socket is unidentified. CPU SPEED CONFIGURATION 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 Note: The locations of J18 & J19 are unidentified. VRAM CONFIGURATION Size Bank 0 Bank 1 512KB 512KB NONE 1MB 512KB (4) 256K x 4 Note: Bank 0 is factory installed and is not configurable. The location is unidentified.