UNIDENTIFIED UC 4915-C AIO Processor 80486SX/CX487SX/80486DX/80486DX2/P23N/P23T/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set UMC Max. Onboard 64MB DRAM Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, game port, IDE interface, parallel port, serial ports (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Speaker J9 Serial port 1 J2 IDE interface LED JP14 Game port J4 Power LED & keylock JP40 Parallel port J5 Reset switch JP41 Serial port 2 J6 Turbo switch JP42 Floppy drive interface J7 Turbo LED JP43 IDE interface J8 USER CONFIGURABLE SETTINGS Function Jumper Position » BIOS type select EPROM JP2 pins 1 & 2 closed BIOS type select flash BIOS JP2 pins 2 & 3 closed » Floppy drive interface enabled JP3 pins 1 & 2 closed Floppy drive interface disabled JP3 pins 2 & 3 closed » Parallel port enabled JP4 pins 1 & 2 closed Parallel port disabled JP4 pins 2 & 3 closed » COM2/4 enabled JP5 pins 1 & 2 closed COM2/4 disabled JP5 pins 2 & 3 closed » COM2 enabled JP6 pins 1 & 2 closed COM4 enabled JP6 pins 2 & 3 closed » COM1 enabled JP7 pins 1 & 2 closed COM3 enabled JP7 pins 2 & 3 closed » COM1/3 enabled JP8 pins 1 & 2 closed COM1/3 disabled JP8 pins 2 & 3 closed » Printer I/O port select LPT2 JP9 pins 1 & 2 closed Printer I/O port select LPT3 JP9 pins 2 & 3 closed » Monitor type select monochrome JP10 pins 1 & 2 closed Monitor type select color JP10 pins 2 & 3 closed » Game port enabled JP11 pins 1 & 2 closed Game port disabled- JP11 pins 2 & 3 closed » Hard drive installed JP12 pins 2 & 3 closed Hard drive not installed JP12 pins 1 & 2 closed » IDE interface enabled JP13 pins 1 & 2 closed IDE interface disabled JP13 pins 2 & 3 closed » Weitek VGA card not installed JP30 pins 1 & 2 closed Weitek VGA card installed JP30 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 36 2MB (1) 512K x NONE NONE NONE 36 2MB (1) 256K x (1) 256K x NONE NONE 36 36 3MB (1) 512K x NONE (1) 256K x NONE 36 36 3MB (1) 256K x (1) 256K x (1) 256K x NONE 36 36 36 4MB (1) 512K x NONE (1) 256K x (1) 256K x 36 36 36 4MB (1) 512K x NONE (1) 512K x NONE 36 36 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 4MB (1) 1M x 36 NONE NONE NONE 5MB (1) 1M x 36 (1) 256K x NONE NONE 36 6MB (1) 512K x NONE (1) 1M x 36 NONE 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x NONE 36 36 7MB (1) 512K x NONE (1) 1M x 36 (1) 256K x 36 36 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 8MB (1) 2M x 36 NONE NONE NONE 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 9MB (1) 2M x 36 NONE (1) 256K x NONE 36 9MB (1) 1M x 36 (1) 1M x 36 (1) 256K x NONE 36 10MB (1) 512K x NONE (1) 2M x 36 NONE 36 10MB (1) 2M x 36 NONE (1) 256K x (1) 256K x 36 36 10MB (1) 2M x 36 NONE (1) 512K x NONE 36 10MB (1) 1M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 12MB (1) 2M x 36 NONE (1) 1M x 36 NONE 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 13MB (1) 2M x 36 NONE (1) 1M x 36 (1) 256K x 36 13MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 256K x 36 16MB (1) 2M x 36 NONE (1) 1M x 36 (1) 1M x 36 16MB (1) 2M x 36 NONE (1) 2M x 36 NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 4M x 36 NONE NONE NONE 17MB (1) 4M x 36 (1) 256K x NONE NONE 36 18MB (1) 512K x NONE (1) 4M x 36 NONE 36 18MB (1) 4M x 36 (1) 256K x (1) 256K x NONE 36 36 19MB (1) 512K x NONE (1) 4M x 36 (1) 256K x 36 36 19MB (1) 4M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 20MB (1) 4M x 36 (1) 1M x 36 NONE NONE 21MB (1) 4M x 36 (1) 1M x 36 (1) 256K x NONE 36 22MB (1) 512K x NONE (1) 4M x 36 (1) 1M x 36 36 22MB (1) 4M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 24MB (1) 2M x 36 NONE (1) 4M x 36 NONE 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 NONE 25MB (1) 2M x 36 NONE (1) 4M x 36 (1) 256K x 36 25MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 256K x 36 28MB (1) 2M x 36 NONE (1) 4M x 36 (1) 1M x 36 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 33MB (1) 4M x 36 (1) 4M x 36 (1) 256K x NONE 36 34MB (1) 4M x 36 (1) 4M x 36 (1) 256K x (1) 256K x 36 36 36MB (1) 512K x NONE (1) 4M x 36 (1) 4M x 36 36 36MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 NONE 37MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 (1) 256K x 36 40MB (1) 2M x 36 NONE (1) 4M x 36 (1) 4M x 36 40MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 49MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 256K x 36 52MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 64MB (1) 4M x 36 (1) 4M x 36 (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 CACHE JUMPER CONFIGURATION Size JP31 JP34 JP35 JP36 64KB Open Open Open pins 1 & 2 closed 128KB Open Closed pins 2 & 3 pins 2 & 3 closed closed 256KB Closed Closed pins 1 & 2 pins 1 & 2 closed closed CPU TYPE CONFIGURATION Type JP38 JP39 80486SX pins 2 & 3 closed Open 80486DX pins 1 & 2, 3 & 4 pins 2 & 3 closed closed 80486DX2 pins 1 & 2, 3 & 4 pins 2 & 3 closed closed P23N pins 1 & 2, 3 & 4 pins 1 & 2 closed closed P23T pins 1 & 2, 3 & 4 pins 1 & 2 closed closed Pentium Overdrive pins 1 & 2, 3 & 4 pins 2 & 3 closed closed CPU TYPE CONFIGURATION (CX487SX) Type JP21 JP25 JP37 Installed pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed Not installed pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed CPU SPEED CONFIGURATION Speed JP26 JP27 25MHz Closed Closed 33MHz Open Closed 40MHz Closed Open 50iMHz Closed Closed 50MHz Open Open 66iMHz Open Closed