AST RESEARCH, INC. PREMMIA MS 486 Processor 80486SX/80486DX/ODP486SX/80486DX2/80486DX4/Pentium Overdrive Processor 25/33/50(internal)/66(internal)MHz Speed Chip Set AST Max. Onboard 128MB DRAM Cache 64/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location VGA port CN1 External battery J26 Parallel port CN2 Speaker J27 Serial port 2 CN3 Chassis fan power J28 Serial port 1 CN4 Front panel connector J29 PS/2 mouse port CN5 Chassis fan power J32 IDE interface 2 J22 IDE interface LED J40 IDE interface 1 J23 Riser Card SL1 Floppy drive interface J24 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Cache type select write back E1 Open Cache type select write E1 Closed through » Factory configured - do not E6 pins 1 & 2 alter closed » CMOS memory normal E8 Open CMOS memory clear E8 Closed » Flash BIOS write protect SW1/1 Off enabled Flash BIOS write protect SW1/1 On disabled » Password enabled SW1/2 On Password disabled SW1/2 Off » Monitor type select color SW1/3 On Monitor type select SW1/3 Off monochrome » System setup enabled SW1/4 On system setup disabled SW1/4 Off » Factory configured - do not SW1/5 Off alter » Factory configured - do not SW1/6 Off alter » Factory configured - do not SW1/7 Off alter » Factory configured - do not SW1/8 Off alter DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 2MB (1) 256K x (1) 256K x NONE NONE 36 36 3MB (1) 256K x (1) 256K x (1) 256K x NONE 36 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 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 9MB (1) 1M x 36 (1) 1M x 36 (1) 256K x NONE 36 10MB (1) 1M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M 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 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) 4M x 36 (1) 4M x 36 (1) 1M x 36 NONE 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 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 8M x 36 (1) 8M x 36 NONE NONE 65MB (1) 8M x 36 (1) 8M x 36 (1) 256K x NONE 36 66MB (1) 8M x 36 (1) 8M x 36 (1) 256K x (1) 256K x 36 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 68MB (1) 8M x 36 (1) 8M x 36 (1) 1M x 36 NONE 72MB (1) 8M x 36 (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 NONE 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size E5 64KB Open 256KB Closed CPU TYPE CONFIGURATION Type E1 E2 E3 E4 80486SX (PQFP) Open pins 2 & 3 pins 1 & 2 Open closed closed ODP486SX Open pins 2 & 3 pins 1 & 2 Open closed closed 80486DX (write Open pins 1 & 2 pins 2 & 3 Open back) closed closed 80486DX/DX2 Open pins 1 & 2 pins 1 & 2 Open closed closed 80486DX4 Open pins 1 & 2 pins 1 & 2 Open closed closed Pentium Overdrive Open pins 2 & 3 pins 2 & 3 Open closed closed CPU SPEED CONFIGURATION Speed E7 E9 25MHz pins 1 & 2 closed Closed 33MHz pins 2 & 3 closed Open 50iMHz pins 1 & 2 closed Closed 66iMHz pins 2 & 3 closed Open