
DELL COMPUTER CORPORATION

System 4XXDE

Processor            80486SX/80487SX/80486DX
Processor Speed      20/25/33/50MHz
Chip Set             VLSI
Max. Onboard DRAM    48MB (96MB on revision 1.1 or higher)
Cache                None (128KB on 450DE and 433DE)
BIOS                 AMI
Dimensions           329mm x 334mm
I/O Options          32-bit external CPU card slot, bus mouse, floppy
                     drive interface, IDE interface, status LCD, parallel
                     port, serial ports (2), VGA port
NPU Options          None (4167 on 433DE)

[Image]

                                CONNECTIONS

  Purpose               Location     Purpose                   Location

  VGA port                 CN1       External battery            JBAT

  Parallel port            CN2       Cooling fan                 JFAN

  Serial port 2            CN3       VGA pass-through            JFEAT

  Serial port 1            CN4       Primary floppy drive        JFLOP
                                     interface

  Bus mouse port           CN5       IDE interface               JIDE

  Board ground             GND       Front panel status          JVIEW
  points                             LCD

  IDE interface LED       JLED       Reset switch                RSET

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Boot EEPROM write/clear                BOOT              Closed
      enabled

      Boot EEPROM write/clear                BOOT               Open
      disabled

     Factory test disabled                  MNT                Open

      Factory test enabled                   MNT               Closed

     VGA interface enabled                 SW1/1               Off

      VGA interface disabled                SW1/1                On

     Monitor type select fixed             SW1/2               Off
      frequency

      Monitor type select multi             SW1/2                On
      frequency

     Password check enabled                SW1/3                On

      Password check disabled               SW1/3               Off

     BIOS chip select flash                SW1/4               Off
      EEPROM

      BIOS chip select auxiliary            SW1/4                On
      ROM

                            DRAM CONFIGURATION

  Size    Bank 0     Bank 1     Bank 2     Bank 3     Bank 4     Bank 5

  4MB     (1)512K    (1)512K     NONE       NONE       NONE       NONE
           x 36       x 36

  6MB     (1)512K    (1)512K    (1)256K    (1)256K     NONE       NONE
           x 36       x 36       x 36       x 36

  6MB     (1)256K    (1)256K    (1)256K    (1)256K    (1)256K   (1)256K x
           x 36       x 36       x 36       x 36       x 36        36

  8MB     (1)512K    (1)512K    (1)256K    (1)256K    (1)256K   (1)256K x
           x 36       x 36       x 36       x 36       x 36        36

  8MB     (1)512K    (1)512K    (1)512K    (1)512K     NONE       NONE
           x 36       x 36       x 36       x 36

  8MB    (1) 1M x   (1) 1M x     NONE       NONE       NONE       NONE
            36         36

  10MB    (1)512K    (1)512K    (1)512K    (1)512K    (1)256K   (1)256K x
           x 36       x 36       x 36       x 36       x 36        36

  10MB   (1) 1M x   (1) 1M x    (1)256K    (1)256K     NONE       NONE
            36         36        x 36       x 36

  12MB   (1) 1M x   (1) 1M x    (1)256K    (1)256K    (1)256K   (1)256K x
            36         36        x 36       x 36       x 36        36

  12MB   (1) 1M x   (1) 1M x    (1)512K    (1)512K     NONE       NONE
            36         36        x 36       x 36

  12MB    (1)512K    (1)512K    (1)512K    (1)512K    (1)512K   (1)512K x
           x 36       x 36       x 36       x 36       x 36        36

  14MB   (1) 1M x   (1) 1M x    (1)512K    (1)512K    (1)256K   (1)256K x
            36         36        x 36       x 36       x 36        36

  16MB   (1) 1M x   (1) 1M x    (1)512K    (1)512K    (1)512K   (1)512K x
            36         36        x 36       x 36       x 36        36

  16MB   (1) 1M x   (1) 1M x   (1) 1M x   (1) 1M x     NONE       NONE
            36         36         36         36

  16MB   (1) 2M x   (1) 2M x     NONE       NONE       NONE       NONE
            36         36

  18MB   (1) 1M x   (1) 1M x   (1) 1M x   (1) 1M x    (1)256K   (1)256K x
            36         36         36         36        x 36        36

  18MB   (1) 2M x   (1) 2M x    (1)256K    (1)256K     NONE       NONE
            36         36        x 36       x 36

  20MB   (1) 2M x   (1) 2M x    (1)256K    (1)256K    (1)256K   (1)256K x
            36         36        x 36       x 36       x 36        36

                        DRAM CONFIGURATION (CONT)

  Size    Bank 0   Bank 1    Bank 2      Bank 3     Bank 4       Bank 5

  20MB    (1) 1M   (1) 1M   (1) 1M x    (1) 1M x   (1)512K x    (1)512K x
          x 36     x 36        36          36         36           36

  20MB    (1) 2M   (1) 2M   (1)512K x   (1)512K x    NONE         NONE
          x 36     x 36        36          36

  22MB    (1) 2M   (1) 2M   (1)512K x   (1)512K x  (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  24MB    (1) 2M   (1) 2M   (1) 1M x    (1) 1M x     NONE         NONE
          x 36     x 36        36          36

  24MB    (1) 2M   (1) 2M   (1)512K x   (1)512K x  (1)512K x    (1)512K x
          x 36     x 36        36          36         36           36

  26MB    (1) 2M   (1) 2M   (1) 1M x    (1) 1M x   (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  28MB    (1) 2M   (1) 2M   (1) 1M x    (1) 1M x   (1)512K x    (1)512K x
          x 36     x 36        36          36         36           36

  32MB    (1) 2M   (1) 2M   (1) 2M x    (1) 2M x     NONE         NONE
          x 36     x 36        36          36

  32MB    (1) 2M   (1) 2M   (1) 1M x    (1) 1M x    (1) 1M x    (1) 1M x
          x 36     x 36        36          36         36           36

  32MB    (1) 4M   (1) 4M     NONE        NONE       NONE         NONE
          x 36     x 36

  34MB    (1) 2M   (1) 2M   (1) 2M x    (1) 2M x   (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  34MB    (1) 4M   (1) 4M   (1)256K x   (1)256K x    NONE         NONE
          x 36     x 36        36          36

  36MB    (1) 2M   (1) 2M   (1) 2M x    (1) 2M x   (1)512K x    (1)512K x
          x 36     x 36        36          36         36           36

  38MB    (1) 4M   (1) 4M   (1)512K x   (1)512K x  (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  40MB    (1) 2M   (1) 2M   (1) 2M x    (1) 2M x    (1) 1M x    (1) 1M x
          x 36     x 36        36          36         36           36

  40MB    (1) 4M   (1) 4M   (1) 1M x    (1) 1M x     NONE         NONE
          x 36     x 36        36          36

  42MB    (1) 4M   (1) 4M   (1) 1M x    (1) 1M x   (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  48MB    (1) 2M   (1) 2M   (1) 2M x    (1) 2M x    (1) 2M x    (1) 2M x
          x 36     x 36        36          36         36           36

  48MB    (1) 4M   (1) 4M   (1) 2M x    (1) 2M x     NONE         NONE
          x 36     x 36        36          36

  50MB    (1) 4M   (1) 4M   (1) 2M x    (1) 2M x   (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  52MB    (1) 4M   (1) 4M   (1) 2M x    (1) 2M x   (1)512K x    (1)512K x
          x 36     x 36        36          36         36           36

  56MB    (1) 4M   (1) 4M   (1) 2M x    (1) 2M x    (1) 1M x    (1) 1M x
          x 36     x 36        36          36         36           36

  64MB    (1) 4M   (1) 4M   (1) 2M x    (1) 2M x    (1) 2M x    (1) 2M x
          x 36     x 36        36          36         36           36

  64MB    (1) 4M   (1) 4M   (1) 4M x    (1) 4M x     NONE         NONE
          x 36     x 36        36          36

  66MB    (1) 4M   (1) 4M   (1) 4M x    (1) 4M x   (1)256K x    (1)256K x
          x 36     x 36        36          36         36           36

  68MB    (1) 4M   (1) 4M   (1) 4M x    (1) 4M x   (1)512K x    (1)512K x
          x 36     x 36        36          36         36           36

  72MB    (1) 4M   (1) 4M   (1) 4M x    (1) 4M x    (1) 1M x    (1) 1M x
          x 36     x 36        36          36         36           36

  80MB    (1) 4M   (1) 4M   (1) 4M x    (1) 4M x    (1) 2M x    (1) 2M x
          x 36     x 36        36          36         36           36

  96MB    (1) 4M   (1) 4M   (1) 4M x    (1) 4M x    (1) 4M x    (1) 4M x
          x 36     x 36        36          36         36           36

