AST RESEARCH, INC. BRAVO MT (202528-XXX) Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive Processor 25/33/50(internal)/66(internal)MHz Speed Chip Set AST Max. Onboard 64MB DRAM Cache 64/256KB BIOS AST Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock E1 VGA port J18 Reset switch E3 VGA feature connector J19 IDE interface LED E4 IDE interface J22 PS/2 mouse port J12 Floppy drive J24 interface Parallel port J13 Chassis fan power J28 Serial ports (2) J10 & J44 Note: Serial port J44 is located under J10. USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » CMOS memory normal operation E5 Open CMOS memory clear E5 Closed » Factory configured - do not E14 pins 1 & 2 alter closed » Parallel port IRQ select E15 pins 1 & 2 IRQ7 closed Parallel port IRQ select E15 pins 2 & 3 IRQ5 closed » Factory configured - do not E800 pins 1 & 2 alter closed » Factory configured - do not E801 pins 2 & 3 alter closed » Power management enabled E802 pins 1 & 2 closed Power management disabled E802 pins 2 & 3 closed » Factory configured - do not E803 pins 1 & 2 alter closed » Factory configured - do not E804 pins 1 & 2 alter closed » On board video enabled SW1/1 Off On board video disabled SW1/1 On » POST type select normal SW1/2 Off POST type select test loop SW1/2 On » Boot type select normal SW1/3 Off Boot type select flash BIOS SW1/3 On update » Password enabled SW1/4 Off Password disabled SW1/4 On » Monitor type select color SW1/5 On Monitor type select SW1/5 Off monochrome » Factory configured - do not SW1/6 Off alter » Factory configured - do not SW1/7 Off alter » System setup type select SW1/8 Off allow access System setup type select SW1/8 On deny access 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 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 E6 E7 E8 64KB pins 1 & 2 Open Open closed 256KB pins 2 & 3 Closed Closed closed Note: Some later versions have omitted jumper E6. CPU UPGRADE CONFIGURATION Type E9 E10 E11 E12 E13 None N/A N/A N/A N/A 2 & 3 80486SX Open 2 & 3 2 & 3 2 & 3 1 & 2 80487SX Closed 1 & 2 1 & 2 2 & 3 1 & 2 80486DX/DX2 Closed 2 & 3 1 & 2 2 & 3 2 & 3 Overdrive (ODPR) Closed 2 & 3 1 & 2 2 & 3 1 & 2 Overdrive (ODP) Closed 1 & 2 1 & 2 2 & 3 2 & 3 Overdrive (P24T) Closed 1 & 2 1 & 2 1 & 2 2 & 3 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed E16 25MHz Open 33MHz Closed 50iMHz Open 66iMHz Closed VIDEO MEMORY CONFIGURATION Size Bank 0 Bank 1 Bank 2 512KB (1) 256K x 16 NONE NONE 1MB (1) 256K x 16 (1) 256K x 16 NONE 2MB (1) 256K x 16 (1) 256K x 16 (2) 256K x 16 Note: Bank 0 is factory installed and is not configurable.