
DELL COMPUTER CORPORATION

DIMENSION 386SX/25

Processor               80386SX
Processor Speed         25MHz
Chip Set                VLSI Topcat
Max. Onboard DRAM       16MB
SRAM Cache              None
BIOS                    AMI
Dimensions              330mm x 218mm
I/O Options             Floppy drive interface, IDE interface, Bus mouse
                        port

                        parallel port, serial port (2), VGA port
NPU Options             80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Serial port (COM A)         P3       VGA port                    P10

  Parallel port               P4       Reset switch                P11

  Floppy drive interface      P5       Speaker                     P12

  IDE interface               P6       Power LED & keylock         P13

  Serial port (COM B)         P7       Turbo LED                   P14

  Bus mouse                   P9       IDE interface LED           P15

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper           Position

     VGA port enabled                         JP1           pins 2 & 3
                                                               closed
                                               JP2
                                                             pins 1 & 2
                                                               closed

      VGA port disabled                        JP1           pins 1 & 2
                                                               closed
                                               JP2
                                                             pins 2 & 3
                                                               closed

     Single IDE drive installed               JP3           pins 1 & 2
                                                               closed

      Dual IDE drive installed                 JP3           pins 2 & 3
                                                               closed

     Pipeline mode enabled                    JP4           pins 2 & 3
                                                               closed

      Pipeline mode disabled                   JP4           pins 1 & 2
                                                               closed

     Floppy drive disk change signal          JP5           pins 1 & 2
      disabled                                                 closed

      Floppy drive disk change signal          JP5           pins 2 & 3
      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                 SW1/switch 1          open
      Non-MultiSync I

      Monitor type select MultiSync I     SW1/switch 1         closed

     VGA style select PS/2               SW1/switch 2         closed

      VGA style select AT                 SW1/switch 2          open

     Select 1024 x 768 interlaced        SW1/switch 5          open

      Select 1024 x 768 non-interlaced    SW1/switch 5         closed

                      REFRESH RATE CONFIGURATION

            Mode 800 x 600               SW1/switch 3    SW1/switch 4

  16 colors @ 72Hz/256 colors @ 60Hz         open            open

  16 colors @ 60Hz/256 colors @ 60Hz         open           closed

  16 colors @ 72Hz/256 colors @ 56Hz        closed           open

  16 colors @ 56Hz/256 colors @ 56 Hz       closed          closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (2) 256K x 9   (2) 256K x 9

      2MB         (2) 1M x 9         NONE

      4MB         (2) 1M x 9      (2) 1M x 9

      8MB         (2) 4M x 9         NONE

      10MB        (2) 4M x 9      (2) 1M x 9

      16MB        (2) 4M x 9      (2) 4M x 9

