DELL COMPUTER CORPORATION

SYSTEM 486/T

Processor  80486SX/80487SX/80486DX/ODP486SX/80486DX2/ODP586SX
Processor  16/20/25/32(internal)/33/40(internal)/40/50(internal)/66(internal)
Speed
Chip Set   Headland
Max.       64MB
Onboard
DRAM
SRAM Cache 128KB (on optional card)
BIOS       AMI
Dimensions 330mm x 218mm
I/O        Floppy drive interface, IDE interface, bus mouse port
Options
           parallel port, serial port (2), VGA feature connector, VGA port

           video memory module connection
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  VGA port                    C1       External cache card         S1

  Bus mouse                   C2       External battery            J1

  Parallel port              JPAR      IDE interface LED           J2

  Serial port 1 & 2          JCOM      Speaker                     J3

  Floppy drive              JFLOP      Fan                         J4
  interface

  IDE drive interface        JIDE      Video memory upgrade      JVMEM1
                                       module

  VGA feature connector     JFEAT      Video memory upgrade      JVMEM2
                                       module

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   External cache enabled                 JCACHE           closed

      External cache disabled                JCACHE            open

  »   Password option enabled                 EPWD            closed

      Password option disabled                EPWD             open

  »   Factory configured - do not alter       IOALT            open

  »   Flash BIOS upgrade enabled              EFLU            closed

      Flash BIOS upgrade disabled (BIOS       EFLU             open
      write protected)

  »   On board VGA interface enabled          EVGA            closed

      On board VGA interface disabled         EVGA             open

                       CPU SPEED CONFIGURATION (JP1)

   Speed      pins 1 &     pins 3 &    pins 5 &     pins 7 &    pins 9 &
                 2            4           6            8           10

   16MHz       closed       open         open        open         open

   20MHz        open       closed        open        open         open

   25MHz        open        open        closed       open         open

   33MHz        open        open         open       closed        open

   40MHz        open        open         open        open        closed

                            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

     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

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