
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

