DELL COMPUTER CORPORATION

4XX/M, 4XXS/M

Processor         80486SX/80486DX/80486DX2
Processor Speed   25/33/50(internal)/66(internal)MHz
Chip Set          LSI
Max. Onboard DRAM 64MB
Cache             128KB (on external cache card)
BIOS              Phoenix
Dimensions        330mm x 218mm
I/O Options       Floppy drive interface, IDE interface, parallel port,
                  PS/2 mouse port, serial ports (2), VGA feature connector,
                  VGA port
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse port             CN1      IDE interface               CN8

  Serial port 1               CN2      IDE interface LED           J1

  Serial port 2               CN3      Chassis fan power           J2

  Parallel port               CN4      External battery            J3

  VGA port                    CN5      Front panel connector       J4

  VGA feature connector       CN6      External cache card         SL1
                                       slot

  Floppy drive interface      CN7

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   External cache card not                 JP1             Closed
      installed

      External cache card installed           JP1              Open

  »   Password enabled                        JP2             Closed

      Password disabled                       JP2              Open

  »   Factory configured - do not             JP3              Open
      alter

  »   Flash BIOS write protect                JP4             Closed
      disabled

      Flash BIOS write protect enabled        JP4              Open

  »   On board VGA enbled                     JP5             Closed

      On board VGA disabled                   JP5              Open

  »   Factory configured - do not             JP6              Open
      alter

  »   Factory configured - do not             JP7              Open
      alter

  »   Factory configured - do not             JP10             Open
      alter

  »   Factory configured - do not             JP11             Open
      alter

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

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

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

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

     16MB       (1) 4M x 36       NONE           NONE          NONE

     20MB       (1) 4M x 36   (1) 1M x 36        NONE          NONE

     24MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36       NONE

     28MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

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

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

     40MB       (1) 4M x 36   (1) 4M x 36    (1) 1M x 36    (1) 1M x 36

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

     52MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 1M x 36

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

   CPU SPEED CONFIGURATION

  Speed      JP8       JP9

  25MHz     Closed     Open

  33MHz      Open     Closed

  50iMHz    Closed     Open

  66iMHz     Open     Closed

                  VIDEO MEMORY CONFIGURATION

        Size                Bank 0               Bank 1

        512KB            (4) 256K x 4             NONE

         1MB             (4) 256K x 4         (4) 256K x 4

  Note: Bank 0 is factory installed and is not configurable.