
AMERICAN MEGATRENDS, INC.

MEGARUM 758

Processor         Pentium II
Processor Speed   120/133/150/166/180/200/210/233/240/266MHz
Chip Set          Unidentified
Video Chip Set    ATI
Maximum Onboard   1GB (EDO supported)
Memory
Maximum Video     2MB
Memory
Cache             256/512KB (located on Pentium II CPU)
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit PCI slots (6), floppy drive interface, green PC
                  connector, IDE interfaces (2), SCSI interfaces (2), Wide
                  SCSI interfaces (2), parallel port, PS/2 mouse interface,
                  serial ports (2), VGA interface, VRM connectors (2), USB
                  connectors (2), CPU Slot 1s (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse interface        J1       Turbo LED                  J33

  CPU fan power 1             J2       SCSI interface 1           J36

  Parallel port               J3       SCSI interface 2           J37

  Floppy drive                J4       IDE interface LED          J38
  interface

  CPU fan power 2             J7       SCSI interface LED         J40

  Serial port 2               J8       Power LED & keylock        J41

  Serial port 1               J9       Wide SCSI interface 1      J44

  IDE interface              J10       Wide SCSI interface 2      J45

  IDE interface              J11       Speaker                    J46

  VGA interface              J16       System override            J47
                                       connector

  Green PC connector         J18       32-bit PCI slots        PC1 - PC6

  USB connector 1            J19       CPU Slot 1                 SL1

  USB connector 2            J20       CPU Slot 2                 SL2

  Chassis fan power          J23       VRM connector 1            VRM1

  Reset switch               J28       VRM connector 2            VRM2

  Chassis intrusion          J29
  connector

  Note: The location of J18 is unidentified.

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           C1           Unidentified
      alter

     Factory configured - do not           C2           Unidentified
      alter

     Factory configured - do not           C3           Unidentified
      alter

     PCI IRQ disabled for onboard          J13             Closed
      PCI VGA

      PCI IRQ enabled for onboard           J13              Open
      PCI VGA

     On board video enabled                J14              Open

      On board video disabled               J14             Closed

     CMOS memory normal operation          J35              Open

      CMOS memory clear                     J35             Closed

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

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

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

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

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

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

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

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

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

     64MB       (2) 4M x 36   (2) 4M x 36        None          None

                        DRAM CONFIGURATION (CON'T)

     Size          Bank 0         Bank 1        Bank 2         Bank 3

     64MB        (2) 8M x 36       None          None           None

     96MB        (2) 4M x 36    (2) 4M x 36   (2) 4M x 36       None

     128MB       (2) 4M x 36    (2) 4M x 36   (2) 4M x 36    (2) 4M x 36

     128MB       (2) 8M x 36    (2) 8M x 36      None           None

     128MB        (2) 16M x        None          None           None
                     36

     192MB       (2) 8M x 36    (2) 8M x 36   (2) 8M x 36       None

     256MB       (2) 8M x 36    (2) 8M x 36   (2) 8M x 36    (2) 8M x 36

     256MB        (2) 16M x      (2) 16M x       None           None
                     36             36

     256MB        (2) 32M x        None          None           None
                     36

     384MB        (2) 16M x      (2) 16M x     (2) 16M x        None
                     36             36            36

     512MB        (2) 16M x      (2) 16M x     (2) 16M x    (2) 16M x 36
                     36             36            36

     512MB        (2) 32M x      (2) 32M x       None           None
                     36             36

     768MB        (2) 32M x      (2) 32M x     (2) 32M x        None
                     36             36            36

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

  Note: Board accepts EDO memory. Do not use 16M x 36 SIMMs that have
  more than 36 chips per SIMM.

                     CACHE CONFIGURATION

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

                            CPU SPEED SELECTION

         Speed                   J21                       J24

        120MHz                  Open            Pins 1 & 2, 3 & 4, 5 & 6,
                                                      7 & 8 closed

        133MHz                 Closed           Pins 1 & 2, 3 & 4, 5 & 6,
                                                      7 & 8 closed

        150MHz                  Open             Pins 3 & 4, 5 & 6, 7 & 8
                                                         closed

        166MHz                 Closed            Pins 3 & 4, 5 & 6, 7 & 8
                                                         closed

        180MHz                  Open             Pins 1 & 2, 5 & 6, 7 & 8
                                                         closed

        200MHz                 Closed            Pins 1 & 2, 5 & 6, 7 & 8
                                                         closed

        210MHz                  Open            Pins 5 & 6, 7 & 8 closed

        233MHz                 Closed           Pins 5 & 6, 7 & 8 closed

        240MHz                  Open             Pins 1 & 2, 3 & 4, 7 & 8
                                                         closed

        266MHz                 Closed            Pins 1 & 2, 3 & 4, 7 & 8
                                                         closed

                           CPU VOLTAGE SELECTION

          Voltage                     J5                     J15

              1.8v           1 & 2, 3 & 4, 7 & 8     1 & 2, 3 & 4, 7 & 8

             1.85v           1 & 2, 3 & 4, 7 & 8,    1 & 2, 3 & 4, 7 & 8,
                                    9 & 10                 9 & 10

              1.9v           1 & 2, 3 & 4, 5 & 6     1 & 2, 3 & 4, 5 & 6

             1.95v           1 & 2, 3 & 4, 5 & 6,    1 & 2, 3 & 4, 5 & 6,
                                    9 & 10                 9 & 10

              2.0v           1 & 2, 3 & 4, 5 & 6,    1 & 2, 3 & 4, 5 & 6,
                                    7 & 8                   7 & 8

             2.05v           1 & 2, 3 & 4, 5 & 6,    1 & 2, 3 & 4, 5 & 6,
                                7 & 8, 9 & 10           7 & 8, 9 & 10

              2.1v                  9 & 10                 9 & 10

              2.2v                  7 & 8                   7 & 8

              2.3v              7 & 8, 9 & 10           7 & 8, 9 & 10

              2.4v                  5 & 6                   5 & 6

              2.5v              5 & 6, 9 & 10           5 & 6, 9 & 10

              2.6v               5 & 6, 7 & 8           5 & 6, 7 & 8

              2.7v           5 & 6, 7 & 8, 9 & 10   5 & 6, 7 & 8, 9 & 10

              2.8v                  3 & 4                   3 & 4

              2.9v              3 & 4, 9 & 10           3 & 4, 9 & 10

              3.0v               3 & 4, 7 & 8           3 & 4, 7 & 8

              3.1v           3 & 4, 7 & 8, 9 & 10   3 & 4, 7 & 8, 9 & 10

              3.2v               3 & 4, 5 & 6           3 & 4, 5 & 6

             3.3v           3 & 4, 5 & 6, 9 & 10   3 & 4, 5 & 6, 9 & 10

              3.4v           3 & 4, 5 & 6, 7 & 8     3 & 4, 5 & 6, 7 & 8

              3.5v           3 & 4, 5 & 6, 7 & 8,    3 & 4, 5 & 6, 7 & 8,
                                    9 & 10                 9 & 10

  Note: Pins designated should be in the closed position. J5 controls
  Slot 1 & J15 controls Slot 2.

