
AMERICAN MEGATRENDS, INC.

ATLAS PCI - II

Processor                Pentium
Processor Speed          75/90/100/120/133MHz
Chip Set                 Unidentified
Video Chip Set           None
Maximum Onboard Memory   256MB DRAM (EDO supported)
Maximum Video Memory     None
Cache                    256/512/1024KB
BIOS                     AMI
Dimensions               254mm x 203mm
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),
                         green VGA interface, cache slot
NPU Options              None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  IDE interface 2             J1       Green PC connector         J27

  Serial port 1               J3       Reset switch               J29

  Serial port 2               J4       Turbo LED                  J33

  Parallel port               J6       IDE interface LED          J34

  Floppy drive interface      J7       Green VGA interface        J42

  IDE interface 1             J8       Chassis fan power          J46

  PS/2 mouse interface       J13       32-bit PCI slots         PC1 - PC4

  Power LED & keylock        J19       Cache slot                 SL1

  Speaker                    J22

                        USER CONFIGURABLE SETTINGS

                 Function                     Label          Position

      Jumper information unidentified          J20              N/A

      Jumper information unidentified          J31              N/A

     PS/2 mouse IRQ12 enabled                 J38           Pins 1 & 2
                                                              closed

      PS/2 mouse IRQ12 disabled                J38           Pins 2 & 3
                                                              closed

      Jumper information unidentified          J45              N/A

      Jumper information unidentified          J47              N/A

      Jumper information unidentified          J50              N/A

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (2) 256K x 36         None

       4MB        (2) 512K x 36         None

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

       6MB        (2) 512K x 36    (2) 256K x 36

       6MB        (2) 256K x 36    (2) 512K x 36

       8MB         (2) 1M x 36          None

       8MB        (2) 512K x 36    (2) 512K x 36

      10MB         (2) 1M x 36     (2) 256K x 36

      10MB        (2) 256K x 36     (2) 1M x 36

      12MB         (2) 1M x 36     (2) 512K x 36

      12MB        (2) 512K x 36     (2) 1M x 36

      16MB         (2) 2M x 36          None

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

      18MB         (2) 2M x 36     (2) 256K x 36

      18MB        (2) 256K x 36     (2) 2M x 36

      20MB         (2) 2M x 36     (2) 512K x 36

      20MB        (2) 512K x 36     (2) 2M x 36

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

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

      32MB         (2) 4M x 36          None

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

            DRAM CONFIGURATION (CONT)

      Size            Bank 0           Bank 1

      34MB         (2) 4M x 36     (2) 256K x 36

      34MB        (2) 256K x 36     (2) 4M x 36

      36MB         (2) 4M x 36     (2) 512K x 36

      36MB        (2) 512K x 36     (2) 4M x 36

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

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

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

      66MB         (2) 8M x 36     (2) 256K x 36

      66MB        (2) 256K x 36     (2) 8M x 36

      68MB         (2) 8M x 36     (2) 512K x 36

      68MB        (2) 512K x 36     (2) 8M x 36

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

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

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

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

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

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

      128MB        (2) 16M x 36         None

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

      130MB        (2) 16M x 36    (2) 256K x 36

      132MB        (2) 16M x 36    (2) 512K 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) 16M x 36     (2) 16M x 36

  Note: Board accepts EDO memory.

               CACHE CONFIGURATION

      Size            Bank 0            SL1

    256KB (A)      (8) 32K x 8     Not installed

    256KB (B)          None          Installed

    512KB (A)      (8) 64K x 8     Not installed

    512KB (B)          None          Installed

     1MB (C)       (8) 128K x 8    Not installed

     1MB (C)           None          Installed

                        CACHE JUMPER CONFIGURATION

      Size               J16               J26                 J28

    256KB (A)         Pins 1 & 2        Pins 1 & 2      Pins 1 & 2 closed
                       closed             closed

    256KB (B)         Pins 2 & 3        Pins 1 & 2      Pins 1 & 2 closed
                       closed             closed

    512KB (A)         Pins 1 & 2        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

    512KB (B)         Pins 2 & 3        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

     1MB (C)          Pins 1 & 2        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

     1MB (C)          Pins 2 & 3        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

          CACHE TYPE CONFIGURATION

       Setting                 J30

  SMT cache enabled     Pins 1 & 2 closed

  SMT cache disabled    Pins 2 & 3 closed

               CPU SPEED SELECTION

  Speed      J24       J25      J37       J39

  75MHz    Closed    Closed     Open      Open

  90MHz    Closed     Open      Open      Open

  100MHz    Open     Closed     Open      Open

  120MHz   Closed     Open      Open     Closed

  133MHz    Open     Closed     Open     Closed

            CPU TYPE SELECTION

        Type                 J11

         VR           Pins 1 & 2 closed

         VRE          Pins 2 & 3 closed

                           CPU VOLTAGE SELECTION

        Voltage               J2              J12               J21

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

  From regulator & VRM       Open         1 & 2, 3 & 4,        Open
                                             5 & 6

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

