DELL COMPUTER CORPORATION Precision 386SX/16, Precision 386SX/25 Processor 80386SX Processor Speed 16/25MHz Chip Set VLSI Max. Onboard DRAM 16MB Cache None BIOS AMI Dimensions 330mm x 218mm I/O Options Bus mouse port, floppy interface, IDE interface, parallel port, serial ports (2), VGA port NPU Options 80387SX [Image] CONNECTIONS Purpose Location Purpose Location Internal battery holder BAT Bus mouse MSE Serial port 1 COM1 Power LED & keylock PLK Serial port 2 COM2 Reset switch RST Floppy drive interface FDD Speaker SPK IDE interface LED HDL Turbo LED TLD IDE interface IDE VGA port VGA Parallel port LPT USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » VGA interrupt request select JP1 pins 1 & 2 none closed VGA interrupt request select JP1 pins 2 & 3 IRQ9 closed » VGA port enabled JP2 pins 1 & 2 closed VGA port disabled JP2 pins 2 & 3 closed » IDE drives installed select JP3 pins 1 & 2 one closed IDE drives installed select JP3 pins 2 & 3 two closed » Pipeline mode enabled JP4 pins 2 & 3 closed Pipeline mode disabled JP4 pins 1 & 2 closed » Floppy drive interface disk JP5 pins 1 & 2 change signal disabled closed Floppy drive interface disk JP5 pins 2 & 3 change signal enabled closed » Monitor type select color JP6 pins 1 & 2 closed Monitor type select monochrome JP6 pins 2 & 3 closed » CMOS memory normal operation JP7 pins 2 & 3 closed CMOS memory clear JP7 pins 1 & 2 closed » Monitor type select standard SW1/1 Off VGA Monitor type select NEC SW1/1 On MultiSync I (only) » Monitor type select PS/2 style SW1/2 On VGA Monitor type select AT style SW1/2 Off VGA » Monitor type select 1024 x 768 SW1/5 On interlaced Monitor type select 1024 x 768 SW1/5 Off non-interlaced DRAM CONFIGURATION Size Bank 0 Bank 1 512KB (2) 256K x 9 NONE 1MB (2) 256K x 9 (2) 256K x 9 2MB (2) 1M x 9 NONE 2.5MB (2) 1M x 9 (2) 256K x 9 4MB (2) 1M x 9 (2) 1M x 9 8MB (2) 4M x 9 NONE 8.5MB (2) 4M x 9 (2) 256K x 9 10MB (2) 4M x 9 (2) 1M x 9 16MB (2) 4M x 9 (2) 4M x 9 Note:The on-board VGA interface will not function with less than 1MB of DRAM installed VGA REFRESH CONFIGURATION Refresh rate SW1/3 SW1/4 » 800 x 600 x 16 at 56Hz or 800 x On On 600 x 256 at 56Hz 800 x 600 x 16 at 72Hz or 800 x On Off 600 x 256 at 56Hz 800 x 600 x 16 at 60Hz or 800 x Off On 600 x 256 at 60Hz 800 x 600 x 16 at 72Hz or 800 x Off Off 600 x 256 at 60Hz VRAM CONFIGURATION Size Bank 0 256KB NONE 512KB (2) 44256 ZIPPs