
DELL COMPUTER CORPORATION

SYSTEM 486P

Processor               80486DX
Processor Speed         16/20/25/33MHz
Chip Set                VLSI
Max. Onboard DRAM       64MB
Cache                   None
BIOS                    Phoenix
Dimensions              349mm x 185mm
I/O Options             Bus mouse port, floppy interface, IDE interface,
                        parallel port, riser card slot, serial ports (2),
                        video upgrade socket, VGA port
NPU Options             None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose               Location

  16-bit riser card          EXP1       Auxiliary ground         GND
                                        points

  IDE interface LED         JHDLED      IDE interface           JIDE

  External battery           JBAT       Power LED & turbo       JLED
                                        LED

  Serial port 1              JCOM1      Parallel port           JLPT1

  Serial port 2              JCOM2      Bus mouse port         JMOUSE

  Cooling fan power          JFAN       VGA memory              JVDB
                                        upgrade socket

  VGA pass-through           JFEAT      Front panel             JVIEW
                                        status LCD

  Floppy drive               JFLOP      VGA port                JVGA
  interface

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     VGA interrupt request select         JP5 pins 1 &       Closed
      none                                      2

      VGA interrupt request select         JP5 pins 1 &        Open
      IRQ9                                      2

     Monitor type select color            JP5 pins 3 &       Closed
                                                4

      Monitor type select monochrome       JP5 pins 3 &        Open
                                                4

     Factory configured - do not          JP5 pins 5 &        Open
      alter                                     6

     Factory configured - do not          JP5 pins 7 &        Open
      alter                                     8

     Password check enabled               JP5 pins 9 &       Closed
                                               10

      Password check disabled              JP5 pins 9 &        Open
                                               10

     Mouse port enabled (uses IRQ12)     JP5 pins 11 &       Closed
                                               12

      Mouse port disabled (IRQ12 not      JP5 pins 11 &        Open
      used)                                    12

     IOCHRDY signal disabled to IDE      JP5 pins 13 &       Closed
      drive(s)                                 14
                                                               Open
                                          JP5 pins 15 &
                                               16

      IOCHRDY signal enabled to IDE       JP5 pins 13 &        Open
      drive(s)                                 14
                                                              Closed
                                          JP5 pins 15 &
                                               16

     Bus wait states select none         JP5 pins 17 &       Closed
                                               18

      Bus wait state select one           JP5 pins 17 &        Open
                                               18

     Factory configured - do not         JP5 pins 19 &        Open
      alter                                    20

     Factory configured - do not             CLRB             Open
      alter

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

     3MB         (1) 256K x    (1) 256K x     (1) 256K x        NONE
                    36             36             36

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

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

     5MB        (1) 1M x 36    (1) 256K x        NONE           NONE
                                   36

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

     7MB        (1) 1M x 36    (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

     9MB        (1) 1M x 36   (1) 1M x 36     (1) 256K x        NONE
                                                  36

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

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

     13MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

     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

     17MB       (1) 4M x 36    (1) 256K x        NONE           NONE
                                   36

     18MB       (1) 4M x 36    (1) 256K x     (1) 256K x        NONE
                                   36             36

     19MB       (1) 4M x 36    (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

     21MB       (1) 4M x 36   (1) 1M x 36     (1) 256K x        NONE
                                                  36

     22MB       (1) 4M x 36   (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

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

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     25MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

     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

     33MB       (1) 4M x 36   (1) 4M x 36     (1) 256K x        NONE
                                                 36

     34MB       (1) 4M x 36   (1) 4M x 36     (1) 256K x    (1) 256K x 36
                                                 36

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

     37MB       (1) 4M x 36   (1) 4M x 36    (1) 1M x 36    (1) 256K x 36

     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

     49MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 256K x 36

     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      JP1       JP2       JP3       JP4

  16MHz     Closed    Open      Open      Open

  20MHz      Open    Closed     Open      Open

  25MHz      Open     Open     Closed     Open

  33MHz      Open     Open      Open     Closed

