
DELL COMPUTER CORPORATION

SYSTEMS 4XX/V, 4XXS/V, 4XX/DV, 4XXS/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

     On board VGA disabled                   JP2             Closed

     On board VGA enabled                    JP2              Open

     VGA IRQ9 disabled                       JP3             Closed

      VGA IRQ9 enabled                        JP3              Open

     On board mouse enabled (IRQ12)          JP4             Closed

      On board mouse disabled (IRQ12)         JP4              Open

     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

  Speed      JP5       JP6

  33MHz      Open     Closed

  50iMHz    Closed     Open

  66iMHz     Open     Closed

