DELL COMPUTER CORPORATION

SYSTEMS 4XX/L(V), 4XX/MX(V) OPTIPLEX

Processor         80486SX/80486DX/80486DX2
Processor Speed   25/33/50(internal)/66(internal)MHz
Chip Set          Headland
Max. Onboard DRAM 64MB
Cache             128KB (on external cache card)
BIOS              Unidentified
Dimensions        330mm x 218mm
I/O Options       32-bit external cache card, 32-bit VESA local bus slot,
                  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        Floppy drive              CN8
                                       interface

  Serial port 1             CN2        IDE interface             CN9

  Serial port 2             CN3        External battery           J3

  Parallel port             CN4        Control panel              J4
                                       connector

  VGA port                  CN5        IDE interface LED          J5

  Video memory              CN6        Riser Card                SL1
  upgrade module

  VGA feature               CN7        32-bit VESA Local         SL2
  connector                            bus/cache slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   VESA riser card disabled              J1 & J2           Closed

      VESA riser card enabled               J1 & J2            Open

  »   IDE IRQ enabled                          J6           pins 2 & 3
                                                              closed

      IDE IRQ disabled                         J6           pins 1 & 2
                                                              closed

  »   Factory configured - do not              J7              Open
      alter

  »   PS/2 mouse (IRQ12) enabled               J8             Closed

      PS/2 mouse (IRQ12) disabled              J8              Open

  »   Factory configured - do not              J9              Open
      alter

  »   Factory configured - do not             J10              Open
      alter

  »   Flash BIOS write protect                J11             Closed
      disabled

      Flash BIOS write protect enabled        J11              Open

  »   CPU type select PGA                     J12             Closed

      CPU type select PQFP                    J12              Open

  »   CMOS memory normal operation            J13             Closed

      CMOS memory clear                       J13              Open

  »   I/O controller address select           J14             Closed
      26Eh-26Fh

      I/O controller address select           J14              Open
      398h-399h

  »   Factory configured - do not             J15              Open
      alter

  »   On board VGA enabled                    J16             Closed

      On board VGA disabled                   J16              Open

  »   Factory configured - do not             J17              Open
      alter

  »   Factory configured - do not             J18              Open
      alter

  »   Factory configured - do not             J20              Open
      alter

  »   Factory configured - do not             J22              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

  VESA CPU SPEED CONFIGURATION

   Speed       J19       J21

   25MHz      Open      Closed

   33MHz     Closed      Open

  50iMHz      Open      Closed

  66iMHz     Closed      Open

                        VIDEO MEMORY CONFIGURATION

       Size             Bank 0            Bank 1               CN6

      512KB          (4) 128K x 8          NONE               NONE

       1MB           (4) 128K x 8      (4) 128K x 8           NONE

       2MB           (4) 128K x 8      (4) 128K x 8       Memory module

            Note: Bank 0 is factory installed and is not configurable. To
            enable 2MB video memory, install memory module over Bank 1 in
            CN6 connectors.