
LEADING EDGE PRODUCTS, INC.

MODEL D4 PLUS

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   25/33/50(internal)/66(internal)MHz
Chip Set          Unidentified
Max. Onboard DRAM 32MB
Cache             64/128/256KB (on CPU card)
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       External CPU card, floppy drive interface, IDE interface,
                  parallel port, PS/2 mouse port, serial ports (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location   Purpose                    Location

  PS/2 mouse port            CN1      Floppy drive interface       CN6

  Serial port 1              CN3      IDE interface                CN7

  Serial port 2              CN4      CPU card slot                SL1

  Parallel port              CN5

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP1             Closed

      Monitor type select monochrome          JP1              Open

     Parallel port enabled (printer)         JP2              Open

      Parallel port disabled                  JP2             Closed

     CMOS memory normal operation            JP3           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP3           pins 2 & 3
                                                              closed

     Standard local bus card                 JP5           pins 1 & 2
      installed                                               closed

      Standard local bus card not             JP5           pins 2 & 3
      installed                                               closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      32MB        (4) 4M x 9      (4) 4M x 9

[Image]

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U12)      TAG (U13)

     64KB        (4) 8K x 8     (4) 8K x 8       NONE        (1) 8K x 8

     128KB      (4) 32K x 8        NONE          NONE        (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 8K x 8     (1) 8K x 8

                     CACHE JUMPER/SWITCH CONFIGURATION

    Size          JP1         SW1/1       SW1/2       SW1/3       SW1/4

    64KB       pins 2 & 3      Off         Off         Off         Off
                closed

   128KB       pins 1 & 2       On         Off         Off         On
                closed

   256KB       pins 2 & 3       On         On          Off         On
                closed

                        CPU TYPE CONFIGURATION

               Type                               JP3

              80486SX                      pins 5 & 6 closed

              80487SX               pins 2 & 3, 4 & 5, 6 & 7 closed

              80486DX               pins 1 & 2, 4 & 5, 6 & 7 closed

             80486DX2               pins 1 & 2, 4 & 5, 6 & 7 closed

