
DELL COMPUTER CORPORATION

XPS 486 MIDSIZE

Processor          80486DX2/80486DX4
Processor Speed    66(internal)/100(internal)MHz
Chip Set           Micronics
Max. Onboard DRAM  64MB
Cache              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)
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port 1              CN1       IDE interface LED           J1

  Serial port 2              CN2       Power LED & keylock         J2

  PS/2 mouse port            CN3       Reset switch                J3

  Parallel port              CN4       Speaker                     J4

  Floppy drive               CN5       Turbo switch                J5
  interface

  IDE interface 1            CN6       Turbo LED                   J6

  IDE interface 2            CN7       32-bit VESA Local bus   SL1 & SL2
                                       slots

                        USER CONFIGURABLE SETTINGS

                 Function                      Jumper         Position

     Factory configured - do not alter          W1            Closed

     Monitor type select color                  W2            Closed

      Monitor type select monochrome             W2             Open

     Mouse IRQ12 enabled                        W3            Closed

      Mouse IRQ12 disabled                       W3             Open

     CMOS memory clear                          W5            Closed

      CMOS memory normal operation               W5             Open

     Factory configured - do not alter          W8          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W10          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W11          pins 2 & 3
                                                               closed

     CPU type select - Intel                   W12          pins 1 & 2
      DX/DX2/DX4/Pentium Overdrive                             closed

      CPU type select - Intel SX                W12          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W13             Open

     Factory configured - do not alter         W16          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W17          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W18             Open

     Factory configured - do not alter         W19          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W22          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W23          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W24          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W25             Open

     IDE port 1 enabled                        W34          pins 1 & 2
                                                               closed

      IDE port 1 disabled                       W34          pins 2 & 3
                                                               closed

      Factory configured - do not alter         W35             Open

     Parallel port type select IRQ7            W36          pins 1 & 2
                                                               closed

      Parallel port type select IRQ5            W36          pins 2 & 3
                                                               closed

     Factory configured - do not alter         W39             Open

     Factory configured - do not alter         W40             Open

     Factory configured - do not alter        SW1/1             On

     Factory configured - do not alter        SW1/2             On

     Factory configured - do not alter        SW1/3            Off

     Factory configured - do not alter        SW1/4            Off

  Note: The location of the factory configured jumpers is unidentified.

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

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

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

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

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

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

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

                  DMA CHANNEL CONFIGURATION

     DMA Channel             W37                  W38

          1            pins 1 & 2 closed   pins 1 & 2 closed

          3            pins 2 & 3 closed   pins 2 & 3 closed

