DIGITAL EQUIPMENT CORPORATION

CELEBRIS 486

Device Type     Mainboard
Processor       80486SX/80486DX/80486DX2/P24D/P24T/P24CT
Processor Speed 25/33/50(internal)/66(internal)/100(internal)MHz
Chip Set        Unidentified
Video Chip Set  Unidentified
Maximum Onboard 128MB
Memory
Maximum Video   1MB
Memory
Cache           256KB
BIOS            Unidentified
Dimensions      254mm x 218mm
I/O Options     Floppy drive interface, IDE interface, PS/2 mouse port,
                riser slot
NPU Options     None

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                  Location

  Chassis fan power        C1         PS/2 mouse port            CN4

  Speaker                  C2         Floppy drive               CN5
                                      interface

  VGA port                 CN1        IDE interface              CN6

  Serial port              CN2        Riser slot                 SL1

  Parallel port            CN3

  Note: VGA & serial port are shown for informational purposes only. The
  location may not be exact.

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

  »   EEPROM write control disabled           J24           Pins 2 & 3
                                                              closed

      EEPROM write control enabled            J24           Pins 1 & 2
                                                              closed

  »   Setup control disabled                  J25           Pins 2 & 3
                                                              closed

      Setup control enabled                   J25           Pins 1 & 2
                                                              closed

  »   Floppy drive write control              J26           Pins 2 & 3
      disabled                                                closed

      Floppy drive write control              J26           Pins 1 & 2
      enabled                                                 closed

                           SIMM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     8MB        (1) 2M x 36       None           None          None

     16MB       (1) 4M x 36       None           None          None

     16MB       (1) 2M x 36   (1) 2M x 36        None          None

     24MB       (1) 4M x 36   (1) 2M x 36        None          None

     24MB       (1) 2M x 36   (1) 2M x 36    (1) 2M x 36       None

     24MB       (1) 2M x 36   (1) 4M x 36        None          None

     32MB       (1) 8M x 36       None           None          None

     32MB       (1) 4M x 36   (1) 2M x 36    (1) 2M x 36       None

     32MB       (1) 4M x 36   (1) 4M x 36        None          None

     32MB       (1) 2M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     40MB       (1) 8M x 36   (1) 2M x 36        None          None

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

     40MB       (1) 2M x 36   (1) 4M x 36    (1) 4M x 36       None

     40MB       (1) 2M x 36   (1) 8M x 36        None          None

     48MB       (1) 8M x 36   (1) 2M x 36    (1) 2M x 36       None

     48MB       (1) 8M x 36   (1) 4M x 36        None          None

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36       None

                       SIMM CONFIGURATION (CON’T)

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     48MB       (1) 4M x 36   (1) 8M x 36        None          None

     56MB       (1) 8M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     56MB       (1) 2M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 8M x 36   (1) 4M x 36    (1) 4M x 36       None

     64MB       (1) 8M x 36   (1) 8M x 36        None          None

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

     72MB       (1) 2M x 36   (1) 8M x 36    (1) 8M x 36       None

     80MB       (1) 8M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     80MB       (1) 4M x 36   (1) 8M x 36    (1) 8M x 36       None

     96MB       (1) 8M x 36   (1) 8M x 36    (1) 8M x 36       None

    104MB       (1) 2M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    112MB       (1) 4M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    128MB       (1) 8M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

                            CACHE CONFIGURATION

  Note: 256KB cache is factory installed and is not configurable. The
  location is unidentified.

                        VIDEO MEMORY CONFIGURATION

  Note: 1MB video memory is factory installed and is not configurable.
  The location is unidentified.

           CPU SPEED SELECTION

        Speed                 J6

        25MHz         Pins 2 & 3 closed

        33MHz         Pins 1 & 2 closed

       50iMHz         Pins 2 & 3 closed

       66iMHz         Pins 1 & 2 closed

       100iMHz        Pins 1 & 2 closed

   CPU TYPE SELECTION

    Type        J50

  80486SX      Open

  80486DX      Open

  80486DX2     Open

    P24D      Closed

    P24T      Closed

   P24CT      Closed

                SERIAL BOOT CONTROL SELECTION

       Setting                J7                   J8

      Disabled         Pins 2 & 3 closed   Pins 2 & 3 closed

       Enabled         Pins 1 & 2 closed   Pins 1 & 2 closed