AST RESEARCH, INC. PREMMIA 486 (202514-000,202557-000,101,202613-X0X) Processor 80486SX/80487SX/ODP486SX/80486DX/80486DX2/Pentium Overdrive/Pentium Processor 25/33/50(internal)/60/66(internal)MHz Speed Chip Set Unidentified Max. Onboard 128MB DRAM Cache 128/256/512KB BIOS Unidentified Dimensions 355mm x 305mm I/O Options Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VGA port, CPU/cache slot, LAN connectors (3) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port CN1 Floppy drive interface J25 2 Parallel port CN2 External battery J26 PS/2 mouse port CN3 Speaker J27 Serial port CN4 Chassis fan power J28 VGA port CN5 Front panel connector J29 LAN module connector J15 Test connector J30 LAN module connector J16 IDE interface LED J35 IDE interface J22 LAN module connector J46 Test connector J23 CPU/cache slot SL1 Floppy drive interface J24 1 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Factory configured - do not CN6 N/A alter » Factory configured - do not E2 Open alter » Parity enabled E3 Closed Parity disabled E3 Open » Factory configured - do not E5 pins 2 & 3 alter closed » On board video enabled SW1/1 On On board video disabled SW1/1 Off » Factory configured - do not SW1/2 Off alter » CMOS memory normal operation SW1/3 Off CMOS memory clear SW1/3 On » Flash BIOS normal operation SW1/4 Off Flash BIOS force update at SW1/4 On boot » Password enabled SW1/5 Off Password disabled SW1/5 On » Factory configured - do not SW1/6 Off alter » Factory configured - do not SW1/7 Off alter » Factory configured - do not SW1/8 Off alter » I/O address select 398h SW1/9 On I/O address select 26Eh SW1/9 Off » Monitor type select color SW1/10 On Monitor type select SW1/10 Off monochrome Note: E5 may not be present on all revisions. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 2MB (1) 256K x (1) 256K x NONE NONE 36 36 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 4MB (1) 512K x (1) 512K x NONE NONE 36 36 6MB (1) 256K x (1) 256K x (1) 512K x (1) 512K x 36 36 36 36 8MB (1) 512K x (1) 512K x (1) 512K x (1) 512K x 36 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 10MB (1) 256K x (1) 256K x (1) 1M x 36 (1) 1M x 36 36 36 12MB (1) 512K x (1) 512K x (1) 1M x 36 (1) 1M x 36 36 36 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 2M x 36 (1) 2M x 36 NONE NONE 18MB (1) 256K x (1) 256K x (1) 2M x 36 (1) 2M x 36 36 36 20MB (1) 512K x (1) 512K x (1) 2M x 36 (1) 2M x 36 36 36 24MB (1) 1M x 36 (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 34MB (1) 256K x (1) 256K x (1) 4M x 36 (1) 4M x 36 36 36 36MB (1) 512K x (1) 512K x (1) 4M x 36 (1) 4M x 36 36 36 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 2M x 36 (1) 2M x 36 (1) 4M x 36 (1) 4M 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 66MB (1) 256K x (1) 256K x (1) 8M x 36 (1) 8M x 36 36 36 68MB (1) 512K x (1) 512K x (1) 8M x 36 (1) 8M x 36 36 36 72MB (1) 1M x 36 (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 80MB (1) 2M x 36 (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 96MB (1) 4M x 36 (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size SL1 128KB Installed 256KB Installed 512KB Installed Note: Only one size can be installed at any one time. If CPU card is installed, cache cannot be installed. CPU TYPE CONFIGURATION Type E1 E4 E6 E7 80486SX (PQFP) pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed 80486SX (PGA) pins 1 & 2 Open pins 2 & 3 pins 2 & 3 closed closed closed 80487SX pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed odp486sx pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed 80486DX pins 1 & 2 pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed closed 80486DX2 pins 1 & 2 pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed closed Pentium pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 Overdrive closed closed closed closed Pentium pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed Note: If PQFP is used, E1 is open. VIDEO MEMORY CONFIGURATION Size Bank 0 Bank 1 1MB 1MB NONE 2MB 1MB (2) 256K x 16 Note: Bank 0 is factory installed and is not configurable. MISCELLANEOUS TECHNICAL NOTE Note: The location of pin 1 is unidentified.