AST RESEARCH, INC. ADVANTAGE! PRO 486 (202643-110, 202688-103) Processor 80486SX/SL80486DX/SL80486DX2/80486DX4/Pentium Overdrive Processor 25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz Speed Chip Set Unidentified Max. 64MB Onboard DRAM Cache 64/256KB BIOS Unidentified Dimensions 355mm x 305mm I/O 32-bit VESA local bus slot, floppy drive interface, IDE Options interface, parallel port, PS/2 mouse port, serial ports (2), 8514 video pass through connector, VGA port NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location VGA port CN1 IDE interface J22 Parallel port CN2 Floppy drive J24 interface Serial port CN3 Speaker J27 Serial port CN4 Chassis fan power J28 PS/2 mouse port CN5 Front panel connector J29 VGA feature connector J19 32-bit VESA local bus SL1 slot Note: The location of J27 is unidentified. USER CONFIGURABLE SETTINGS Function Jumper Position » Parallel port IRQ select IRQ7 E2 pins 1 & 2 closed Parallel port IRQ select IRQ5 E2 pins 2 & 3 closed » On board video enabled E7 Closed On board video disabled E7 Open » Monitor type select color E8 Closed Monitor type select monochrome E8 Open » Factory configured - do not E9 Closed alter » Password enabled E10 Closed Password disabled E10 Open » Factory configured - do not E11 Open alter » Factory configured - do not E16 Open alter Note: The locations of E11 & E16 are unidentified. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 32 2MB (1) 256K x (1) 256K x NONE NONE 32 32 3MB (1) 256K x (1) 256K x (1) 256K x NONE 32 32 32 4MB (1) 1M x 32 NONE NONE NONE 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 32 32 32 32 5MB (1) 1M x 32 (1) 256K x NONE NONE 32 6MB (1) 1M x 32 (1) 256K x (1) 256K x NONE 32 32 7MB (1) 1M x 32 (1) 256K x (1) 256K x (1) 256K x 32 32 32 8MB (1) 1M x 32 (1) 1M x 32 NONE NONE 9MB (1) 1M x 32 (1) 1M x 32 (1) 256K x NONE 32 10MB (1) 1M x 32 (1) 1M x 32 (1) 256K x (1) 256K x 32 32 12MB (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 NONE 13MB (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 (1) 256K x 32 16MB (1) 4M x 32 NONE NONE NONE 16MB (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 17MB (1) 4M x 32 (1) 256K x NONE NONE 32 18MB (1) 4M x 32 (1) 256K x (1) 256K x NONE 32 32 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 19MB (1) 4M x 32 (1) 256K x (1) 256K x (1) 256K x 32 32 32 20MB (1) 4M x 32 (1) 1M x 32 NONE NONE 21MB (1) 4M x 32 (1) 1M x 32 (1) 256K x NONE 32 22MB (1) 4M x 32 (1) 1M x 32 (1) 256K x (1) 256K x 32 32 24MB (1) 4M x 32 (1) 1M x 32 (1) 1M x 32 NONE 25MB (1) 4M x 32 (1) 1M x 32 (1) 1M x 32 (1) 256K x 32 28MB (1) 4M x 32 (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 32MB (1) 4M x 32 (1) 4M x 32 NONE NONE 33MB (1) 4M x 32 (1) 4M x 32 (1) 256K x NONE 32 34MB (1) 4M x 32 (1) 4M x 32 (1) 256K x (1) 256K x 32 32 36MB (1) 4M x 32 (1) 4M x 32 (1) 1M x 32 NONE 37MB (1) 4M x 32 (1) 4M x 32 (1) 1M x 32 (1) 256K x 32 40MB (1) 4M x 32 (1) 4M x 32 (1) 1M x 32 (1) 1M x 32 48MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 NONE 49MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 (1) 256K x 32 52MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 (1) 1M x 32 64MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 CACHE CONFIGURATION Size Bank 0 TAG 64KB (8) 8K x 8 (1) 8K x 9 256KB (8) 32K x 8 (1) 32K x 9 CACHE JUMPER CONFIGURATION Size E12 E14 None Open Open 64KB Open Open 256KB Closed Closed CACHE CONFIGURATION Type E1 E6 E20 Write through pins 1 & 2 pins 1 & 2 Open closed closed Write back pins 2 & 3 pins 2 & 3 Closed closed closed Note: Jumper E20 may not be present on all boards. CPU TYPE CONFIGURATION Type E3 E4 E5 E13 80486SX(PQFP) pins 2 & 3 pins 2 & 3 pins 2 & 3 Open closed closed closed 80486SX(PGA) pins 1 & 2 pins 1 & 2 pins 1 & 2 Closed closed closed closed SL-series CPU’s pins 2 & 3 pins 2 & 3 pins 2 & 3 Closed closed closed closed P24T pins 2 & 3 pins 1 & 2 pins 2 & 3 Closed closed closed closed CPU TYPE CONFIGURATION (1995 MANUFACTURE DATE ONLY) Type E17 E18 E19 Cyrix pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed Intel pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed Note: If above jumpers are not present, the mainboard will only support the CPU supplied by the factory. CPU SPEED CONFIGURATION Speed E15 25MHz Closed 33MHz Open 50iMHz Closed 66iMHz Open 75iMHz Closed 100iMHz Open VIDEO MEMORY CONFIGURATION (1994 MANUFACTURE DATE) Size Bank 0 Bank 1 512KB (4) 256K x 4 NONE 1MB (4) 256K x 4 (4) 256K x 4 VIDEO MEMORY CONFIGURATION (1995 MANUFACTURE DATE) Size Bank 0 Bank 1 512KB (1) 256K x 16 NONE 1MB (1) 256K x 16 (1) 256K x 16 MISCELLANEOUS TECHNICAL NOTE Board shown is 1994 manufacture date. 1994 boards only accept Intel processors. 1995 boards support Intel or Cyrix processors.