
AMERICAN MEGATRENDS, INC.

MERLIN PCI

Processor                Pentium Pro
Processor Speed          150/166/180/200MHz
Chip Set                 Natoma
Video Chip Set           None
Maximum Onboard Memory   512MB (EDO supported)
Maximum Video Memory     None
Cache                    256/512KB (located on Pentium Pro CPU)
BIOS                     AMI
Dimensions               330mm x 218mm
I/O Options              32-bit PCI slots (4), floppy drive interface,
                         green PC connector, IDE interfaces (2), parallel
                         port, PS/2 mouse interface, serial ports (2), VRM
                         connector, USB connectors (2), VRM connector
NPU Options              None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Parallel port               J1       Serial port 2              J12

  IDE interface 1             J2       Serial port 1              J13

  USB connector 2             J4       Reset switch               J32

  USB connector 1             J5       Turbo switch               J34

  Floppy drive interface      J6       Speaker                    J35

  IDE interface 2             J7       IDE interface LED          J36

  Chassis fan power           J8       Power LED & keylock        J37

  Green PC connector         J10       32-bit PCI slots         PC1 - PC4

  PS/2 mouse interface       J11       VRM connector              VRM

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           J24          Unidentified
      alter

     Factory configured - do not           J27          Unidentified
      alter

      PS/2 mouse IRQ12 enabled              J31        Pins 1 & 2 closed

      PS/2 mouse IRQ12 disabled             J31        Pins 2 & 3 closed

     Factory configured - do not           J33          Unidentified
      alter

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      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) 2M x 36    (2) 4M x 36

      64MB        (2) 8M x 36        None

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

      72MB        (2) 8M x 36    (2) 1M x 36

      80MB        (2) 2M x 36    (2) 8M x 36

      96MB        (2) 8M x 36    (2) 4M x 36

     128MB        (2) 16M x 36       None

     128MB        (2) 8M x 36    (2) 8M x 36

     136MB        (2) 16M x 36   (2) 1M x 36

     144MB        (2) 16M x 36   (2) 2M x 36

     160MB        (2) 16M x 36   (2) 4M x 36

     192MB        (2) 16M x 36   (2) 8M x 36

     256MB        (2) 32M x 36       None

     256MB        (2) 16M x 36   (2) 16M x 36

                        DRAM CONFIGURATION (CON'T)

          Size                    Bank 0                   Bank 1

          264MB                (2) 32M x 36             (2) 1M x 36

          272MB                (2) 32M x 36             (2) 2M x 36

          288MB                (2) 32M x 36             (2) 4M x 36

          320MB                (2) 32M x 36             (2) 8M x 36

          384MB                (2) 32M x 36             (2) 16M x 36

          512MB                (2) 32M x 36             (2) 32M x 36

  Note: Board accepts EDO memory. Board also accepts x 32 SIMMs. Banks
  are interchangeable.

                      CACHE CONFIGURATION

  Note: 256KB/512KB cache is located on the Pentium Pro CPU.

                            CPU SPEED SELECTION

  CPU speed     Clock      Multiplier        J19        J20         J28
                speed

   150MHz       60MHz         2.5x          Open       Closed      3 & 4,
                                                                   5 & 6,
                                                                   7 & 8

   166MHz       66MHz         2.5x         Closed       Open       3 & 4,
                                                                   5 & 6,
                                                                   7 & 8

   180MHz       60MHz          3x           Open       Closed      1 & 2,
                                                                   5 & 6,
                                                                   7 & 8

   200MHz       66MHz          3x          Closed       Open       1 & 2,
                                                                   5 & 6,
                                                                   7 & 8

  Note: Pins designated should be in the closed position.

                           CPU VOLTAGE SELECTION

               Voltage                                 J16

                   None                               Open

                   2.1v                         Pins 7 & 8 closed

                   2.2v                         Pins 5 & 6 closed

                   2.3v                     Pins 5 & 6, 7 & 8 closed

                   2.4v                         Pins 3 & 4 closed

                   2.5v                     Pins 3 & 4, 5 & 6 closed

                   2.6v                     Pins 3 & 4, 5 & 6 closed

                   2.7v                  Pins 3 & 4, 5 & 6, 7 & 8 closed

                   2.8v                         Pins 1 & 2 closed

                   2.9v                     Pins 1 & 2, 7 & 8 closed

                   3.0v                     Pins 1 & 2, 5 & 6 closed

                   3.1v                  Pins 1 & 2, 5 & 6, 7 & 8 closed

                   3.2v                     Pins 1 & 2, 3 & 4 closed

                  3.3v                  Pins 1 & 2, 3 & 4, 7 & 8 closed

                   3.4v                  Pins 1 & 2, 3 & 4, 5 & 6 closed

                   3.5v                  Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8
                                                     closed

                             VOLTAGE SELECTION

          Setting                    J3                      J22

      From regulator                Open             Pins 1 & 2, 3 & 4, 5
                                                         & 6 closed

  From 3.3v power supply     Pins 1 & 2, 3 & 4, 5           Open
                                 & 6 closed

