AST RESEARCH, INC. PREMMIA MX 4/66D, PREMMIA MX 4/100T Processor 80486SX/486 Overdrive/80486DX/80486DX2/80486DX4/P24T Processor 25/33/50(internal)/66(internal)/100(internal)MHz Speed Chip Set Unidentified Video Chip Set ATI Maximum 128MB Onboard Memory Maximum Video 4MB Memory Cache 64/256KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), riser slot NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location PS/2 mouse port CN2 External battery J26 Serial port CN3 Speaker J27 Serial port CN4 Chassis fan power J28 Parallel port CN5 Front console LED J29 pins 1 - 4 IDE interface 1 J22 Chassis fan power J32 IDE interface 2 J23 IDE interface LED J40 Floppy drive J24 Riser slot SL1 interface USER CONFIGURABLE SETTINGS Function Label Position » Factory configured - do not alter E6 Pins 1 & 2 closed » CMOS memory normal operation E8 Open CMOS memory clear E8 Closed » Flash BIOS normal operation SW1/1 Off Flash BIOS force update at boot SW1/1 On » Password normal operation SW1/2 On Password clear SW1/2 Off » Monitor type select color SW1/3 On Monitor type select monochrome SW1/3 Off » Setup access enabled SW1/4 Off Setup access disabled SW1/4 On » Factory configured - do not alter SW1/5 Off » Factory configured - do not alter SW1/6 On » Factory configured - do not alter SW1/7 On » Factory configured - do not alter SW1/8 On DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 4MB (1) 1M x 32 None None None 8MB (1) 2M x 32 None None None 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 16MB (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 16MB (1) 4M x 32 None None None 17MB (1) 2M x 32 (1) 2M x 32 (1) 256K x None 32 18MB (1) 2M x 32 (1) 2M x 32 (1) 256K x (1) 256K x 32 32 20MB (1) 2M x 32 (1) 2M x 32 (1) 1M x 32 None 24MB (1) 2M x 32 (1) 2M x 32 (1) 1M x 32 (1) 1M x 32 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 24MB (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 None 32MB (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 32MB (1) 8M x 32 None None None 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 40MB (1) 4M x 32 (1) 4M x 32 (1) 1M x 32 (1) 1M x 32 40MB (1) 4M x 32 (1) 4M x 32 (1) 2M x 32 NONE 48MB (1) 4M x 32 (1) 4M x 32 (1) 2M x 32 (1) 2M x 32 48MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 NONE 64MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 64MB (1) 8M x 32 (1) 8M x 32 NONE NONE 66MB (1) 8M x 32 (1) 8M x 32 (1) 256K x (1) 256K x 32 32 68MB (1) 8M x 32 (1) 8M x 32 (1) 1M x 32 NONE 72MB (1) 8M x 32 (1) 8M x 32 (1) 1M x 32 (1) 1M x 32 72MB (1) 8M x 32 (1) 8M x 32 (1) 2M x 32 NONE 80MB (1) 8M x 32 (1) 8M x 32 (1) 2M x 32 (1) 2M x 32 80MB (1) 8M x 32 (1) 8M x 32 (1) 4M x 32 NONE 96MB (1) 8M x 32 (1) 8M x 32 (1) 4M x 32 (1) 4M x 32 96MB (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 NONE 128MB (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 9 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 9 CACHE JUMPER CONFIGURATION Size E5 64KB Open 256KB Closed CPU SPEED SELECTION 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 100iMHz Pins 1 & 2 closed Closed Note: If 100iMHz is used, jumper E4 must be open. CPU SPEED SELECTION (80486DX4 ONLY) Voltage E4 2x Pins 2 & 3 closed 2.5x Pins 1 & 2 closed 3x Open CPU TYPE SELECTION Type E1 E2 E3 E10 80486SX (PQFP) Open Pins 2 & 3 Pins 1 & 2 Closed closed closed 486 Overdrive Open Pins 2 & 3 Pins 1 & 2 Closed closed closed 80486DX Open Pins 1 & 2 Pins 1 & 2 Closed closed closed 80486DX2 Open Pins 1 & 2 Pins 1 & 2 Closed closed closed 80486DX2 (WB) Open Pins 1 & 2 Pins 2 & 3 Open closed closed 80486DX4 Open Pins 1 & 2 Pins 1 & 2 Closed closed closed P24T Open Pins 2 & 3 Pins 2 & 3 Open closed closed Note: E10 may not be present not on all boards. To use write through cache on P24T, set E1 to the closed position. CPU VOLTAGE CONFIGURATION Voltage E11 E12 E13 E14 E15 E16 3v Cyrix 2 & 3 2 & 3 2 & 3 2 & 3 Open 1 & 2 3v Intel 1 & 2 1 & 2 1 & 2 1 & 2 Closed 2 & 3 5v Cyrix 2 & 3 2 & 3 2 & 3 2 & 3 Open Open 5v Intel 1 & 2 1 & 2 1 & 2 1 & 2 Closed Open Note: Pins designated should be in the closed position. The location of E12 is unidentified. The above jumpers may not be present on all boards. If these jumpers are not present, only Intel CPUs may be used.