AST RESEARCH, INC. PREMIUM/486-25 Processor 80486DX Processor Speed 25MHz Chip Set AST Max. Onboard DRAM None (36MB total on 32-bit external cards) Cache None BIOS AST Dimensions 355mm x 251mm I/O Options Parallel port, serial ports (2), floppy drive interface, IDE interface, 32-bit external CPU/NPU card slot, 32-bit external memory card slots (2), 16-bit external expansion card slot NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location 32-bit external CN1 Auxiliary floppy P4 CPU/NPU card drive interface 32-bit external CN2 Power LED & reset P5 memory card switch 32-bit external CN3 Speaker P6 memory card 16-bit external CN4 External battery P8 expansion card Primary floppy P3 IDE interface P11 drive interface Note:Expansion card slots CN1 through CN4 will accept standard 8 or 16-bit ISA cards. USER CONFIGURABLE SETTINGS Function Jumper Position » Password check enabled E1 pins 1 & 2 closed Password check disabled E1 pins 2 & 3 closed » Factory configured - do not alter E2 Open » Factory configured - do not alter E3 Open [Image] USER CONFIGURABLE SETTINGS Function Jumper Position » Parity check enabled E1 Closed Parity check disabled E1 Open DRAM CONFIGURATION Size Bank 0 Bank 1 2MB (2) 256K x 36 NONE 4MB (2) 256K x 36 (2) 256K x 36 [Image] USER CONFIGURABLE SETTINGS Function SW1 Position » Parity check enabled SW1/1 On Parity check disabled SW1/1 Off » Total system memory is less than SW1/2 Off 16MB Total system memory is 16MB or SW1/2 On more » Factory configured - do not alter SW1/3 Off DRAM SWITCH CONFIGURATION Total memory SW1/4 SW1/5 SW1/6 SW1/7 SW1/8 1MB On On On On Off 2MB On On On Off On 3MB On On On Off Off » 4MB On On Off On On 5MB On On Off On Off 6MB On On Off Off On 7MB On On Off Off Off 8MB On Off On On On 9MB On Off On On Off 10MB On Off On Off On 11MB On Off On Off Off 12MB On Off Off On On 13MB On Off Off On Off 14MB On Off Off Off On 15MB On Off Off Off Off 16MB Off On On On On 17MB Off On On On Off 18MB Off On On Off On 19MB Off On On Off Off 20MB Off On Off On On Note:Set the switches to the total amount of system memory installed not including this card. A setting of more than 4MB means that this card is the second memory card that is installed. DRAM CONFIGURATION Size 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0MB None None None None None None None None None None None None None None None None 1MB Filled None None None None None None None None None None None None None None None 2MB Filled Filled None None None None None None None None None None None None None None 3MB Filled Filled Filled None None None None None None None None None None None None None 4MB Filled Filled Filled Filled None None None None None None None None None None None None 5MB Filled Filled Filled Filled Filled None None None None None None None None None None None 6MB Filled Filled Filled Filled Filled Filled None None None None None None None None None None 7MB Filled Filled Filled Filled Filled Filled Filled None None None None None None None None None Filled Filled Filled Filled Filled Filled Filled Filled Filled None None None None None None None None 9MB Filled Filled Filled Filled Filled Filled Filled Filled Filled None None None None None None None 10MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled None None None None None None 11MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled None None None None None 12MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled None None None None 13MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled None None None 14MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled None None 15MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled None 16MB Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Filled Note:Banks (0 through 15) are filled using (1) 256K x 36 SIMMs. This table is for a single card only.