AST RESEARCH, INC. BRAVO LC 4/100T Processor 80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T Processor 25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz Speed Chip Set Unidentified Video Chip Cirrus Logic Set Maximum 64MB Onboard Memory Maximum 1MB Video Memory Cache 64/256KB BIOS Unidentified Dimensions 355mm x 304mm I/O Options 32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), 8514 video pass through connector, VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location PS/2 mouse port CN1 IDE interface J22 Serial port CN2 Floppy drive J24 interface Serial port CN3 Speaker J27 Parallel port CN4 Chassis fan power J28 VGA port CN5 Front panel LEDs J29 8514 video pass J19 32-bit VESA local SL1 through connector bus slot USER CONFIGURABLE SETTINGS Function Label 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 alter E9 Closed » Password normal operation E10 Closed Password clear E10 Open » Factory configured - do not alter E11 Open » Factory configured - do not alter E16 Open DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x None None None 36 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 5MB (1) 1M x 36 (1) 256K x None None 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x None 36 36 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 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 13MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 256K x 36 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) 4M x 36 (1) 256K x (1) 256K x None 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 DRAM CONFIGURATION (CON'T) Size Bank 0 Bank 1 Bank 2 Bank 3 21MB (1) 4M x 36 (1) 1M x 36 (1) 256K x None 36 22MB (1) 4M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 None 25MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 256K 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) 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) 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 TAG 64KB (8) 8K x 8 (1) 8K x 8 256KB (8) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size E12 E14 64KB Open Open 256KB Closed Closed CACHE TYPE 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: E20 may not be present on all boards. VIDEO MEMORY CONFIGURATION (1994 CONFIGURATION) Size Bank 0 Bank 1 512KB (4) 256K x 4 None 1MB (4) 256K x 4 (4) 256K x 4 Note: Bank 0 is factory installed and is not configurable. On some revisions, Bank 1 may be factory installed. Board shown uses this configuration. VIDEO MEMORY CONFIGURATION (1995 CONFIGURATION) Size Bank 0 Bank 1 512KB (1) 256K x 16 None 1MB (1) 256K x 16 (1) 256K x 16 Note: Bank 0 is factory installed and is not configurable. On some revisions, Bank 1 may be factory installed. If board is a 1995 configuration, install the upgrade chip in socket U802. CPU SPEED SELECTION Speed E15 25MHz Closed 33MHz Open 50iMHz Closed 66iMHz Open 75iMHz Closed 100iMHz Open CPU TYPE SELECTION 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 SL80486DX Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Closed closed closed closed SL80486DX2 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Closed closed closed closed SL80486DX4 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 SELECTION 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: These jumpers may not be present on all boards. If they are not, board only supports processor that was shipped from the factory.