DIGITAL EQUIPMENT CORPORATION

DECPC LPX

Processor         80486SX/80486DX/80486DX2
Processor Speed   25/33/40/50(internal)/50/66(internal)MHz
Chip Set          Unidentified
Video Chip Set    None
Maximum Onboard   64MB
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

  »   Flash BIOS normal operation              J14             Open

      Flash BIOS recovery mode                 J14            Closed

  »   Monitor type select monochrome           J15             Open

      Monitor type select color                J15            Closed

  »   Factory configured – do not alter        J16             Open

  »   VLRDY >CPURDY connects to CPU bus        J28           Pins 1 & 2
      ready                                                   closed

      VLRDY >LRDY synchronized through         J28           Pins 2 & 3
      chipset                                                 closed

  »   Reset switch enabled                     J33            Closed

      Reset switch disabled                    J33             Open

                   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       (3) 16K x 4

     256KB      (4) 32K x 8    (4) 32K x 8    (3) 16K x 4

                        CACHE JUMPER CONFIGURATION

    Size           J35            J36            J37             J38

    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      J24        J25       J26

  25MHz     Closed    Closed     Open

  33MHz     Closed     Open     Closed

  40MHz      Open      Open     Closed

  50iMHz    Closed    Closed     Open

  50MHz      Open      Open      Open

  66iMHz    Closed     Open     Closed

                        VL BUS WAIT STATE SELECTION

               Setting                                J27

  »                 0                          Pins 1 & 2 closed

                    1                          Pins 2 & 3 closed