DELL COMPUTER CORPORATION

SYSTEMS 4XX/V & 4XX/DV

Processor       80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 33/50(internal)/66(internal)MHz
Chip Set        Opti
Max. Onboard    64MB
DRAM
Cache           128/256KB
BIOS            Unidentified
Dimensions      330mm x 218mm
I/O Options     32-bit VESA local bus slots (2), 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       VGA connector              CN8

  Serial port 1              CN2       VGA feature connector      CN9

  Serial port 2              CN3       IDE interface LED          CN11

  External battery           CN4       Speaker                    CN12

  Parallel port              CN5       Power LED                  CN13

  IDE interface              CN6       Reset switch               CN14

  Floppy drive               CN7       32-bit VESA Local bus    SL1, SL2
  interface                            slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Built in VGA subsystem enabled          JP1             Closed

      Built in VGA subsystem disabled         JP1              Open

  »   Factory configured - do not             JP2              Open
      alter

  »   Factory configured - do not             JP3             Closed
      alter

  »   Factory configured - do not             JP4             Closed
      alter

  »   Factory configured - do not             JP7             Closed
      alter

  »   80486SX installed in PQFP               JP10             Open

      80486SX not installed in PQFP           JP10            Closed

  »   Factory configured - do not             JP11             Open
      alter

  »   256K of cache memory installed          JP12            Closed

      Zero or 128K of cache memory            JP12             Open
      installed

  Note:The exact location of JP11 on system board is unidentified by the
  manufacturer.

                           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

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U42)      TAG (U27)

      0KB           NONE           NONE          NONE           NONE

     128KB      (4) 32K x 8        NONE       (1) 16K x 1    (1) 32K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 16K x 1    (1) 32K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JP8                  JP9

        128KB          pins 1 & 2 closed   pins 1 & 2 closed

        256KB          pins 2 & 3 closed   pins 2 & 3 closed

                          CPU TYPE CONFIGURATION

     CPU Type             JP13              JP14               JP15

      80486SX             Open              Open            pins 2 & 3
                                                              closed

      80486DX            Closed          pins 1 & 2         pins 1 & 2
                                           closed             closed

     80486DX2            Closed          pins 1 & 2         pins 1 & 2
                                           closed             closed

              CPU SPEED CONFIGURATION

  CPU type    CPU speed       JP5          JP6

   80486SX      33MHz         Open       Closed

   80486DX      33MHz         Open       Closed

  80486DX2      50iMHz       Closed       Open

  80486DX2      66iMHz        Open       Closed