DIGITAL EQUIPMENT CORPORATION

DECPC LPX+

Processor     SL80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T
Processor     25/33/40/50(internal)/50/66(internal)/100(internal)MHz
Speed
Chip Set      Unidentified
Video Chip    None
Set
Maximum       64MB
Onboard
Memory
Maximum Video None
Memory
Cache         128/256KB
BIOS          Unidentified
Dimensions    254mm 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

  Parallel port             CN1       IDE interface               CN5

  Serial port               CN2       Floppy drive interface      CN6

  Serial port               CN3       32-bit VESA local bus    SL1 & SL2
                                      slots

  PS/2 mouse port           CN4

                        USER CONFIGURABLE SETTINGS

                 Function                     Label          Position

  »   Monitor type select monochrome           J14             Open

      Monitor type select color                J14            Closed

  »   Password normal operation                J15             Open

      Password clear                           J15            Closed

  »   Reset switch enabled                     J24            Closed

      Reset switch disabled                    J24             Open

  »   Factory configured – do not alter        J36            Closed

  »   VLRDY >CPURDY connects to CPU bus        J44           Pins 1 & 2
      ready                                                   closed

      VLRDY >LRDY synchronized through         J44           Pins 2 & 3
      chipset                                                 closed

                   DRAM CONFIGURATION

       Size             Bank 0             Bank 1

       4MB           (2) 256K x 36     (2) 256K x 36

       4MB           (2) 512K x 36          None

       8MB            (2) 1M x 36           None

       16MB           (2) 2M x 36           None

       16MB           (2) 1M x 36       (2) 1M x 36

       24MB           (2) 2M x 36       (2) 1M x 36

       32MB           (2) 4M x 36           None

       32MB           (2) 2M x 36       (2) 2M x 36

       40MB           (2) 4M x 36       (2) 1M x 36

       48MB           (2) 4M x 36       (2) 2M x 36

       64MB           (2) 4M x 36       (2) 4M x 36

  Note: The location of banks 0 & 1 are unidentified.

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     128KB      (4) 32K x 8        None       (2) 32K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (2) 32K x 8

  Note: The location of banks 0 & 1 are unidentified.

                        CACHE JUMPER CONFIGURATION

    Size           J4              J5             J6             J7

    None          Open            Open           Open           Open

    128KB       Pins 1 & 2     Pins 1 & 2     Pins 1 & 2      Pins 1 & 2
                 closed          closed         closed         closed

    256KB       Pins 2 & 3     Pins 2 & 3     Pins 2 & 3      Pins 2 & 3
                 closed          closed         closed         closed

            CPU SPEED SELECTION

   Speed       J1         J2        J3

   25MHz      Open      Closed    Closed

   33MHz     Closed      Open     Closed

   40MHz     Closed      Open      Open

  50iMHz      Open      Closed    Closed

   50MHz      Open       Open      Open

  66iMHz     Closed      Open     Closed

  100iMHz    Closed      Open     Closed

            CPU TYPE SELECTION

        Type                 J35

      SL80486SX       Pins 2 & 3 closed

      SL80486DX       Pins 2 & 3 closed

     SL80486DX2       Pins 2 & 3 closed

     SL80486DX4       Pins 2 & 3 closed

        P24T          Pins 1 & 2 closed

                        VL BUS WAIT STATE SELECTION

               Setting                                J28

  »                 0                          Pins 1 & 2 closed

                    1                          Pins 2 & 3 closed