
AMERICAN MEGATRENDS, INC.

ATLAS PCI LPX

Processor              Pentium
Processor Speed        75/90/100/120/133/150MHz
Chip Set               Unidentified
Video Chip Set         ATI
Maximum Onboard Memory 128MB (EDO supported)
Maximum Video Memory   2MB
Cache                  256/512KB
BIOS                   AMI
Dimensions             330mm x 228mm
I/O Options            Floppy drive interface, green PC connector, IDE
                       interfaces (2), parallel port, PS/2 mouse port,
                       serial ports (2), VGA feature connector, VGA port,
                       riser slot, cache slot, MIDI/joystick interface
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  Floppy drive interface        J1      Turbo LED                  J32

  IDE interface 1               J2      Chassis fan power          J34

  MIDI/joystick interface       J3      IDE interface LED          J36

  IDE interface 2               J4      Parallel port              J37

  PS/2 mouse port               J9      VGA port                   J41

  Serial port 1                J14      VGA feature connector      J42

  Serial port 2                J19      Green PC connector         J44

  Power LED & keylock          J26      Cache slot                 SL1

  Reset switch                 J28      Riser slot                 SL2

  Speaker                      J31

                        USER CONFIGURABLE SETTINGS

                Function                      Label          Position

      Serial port 2 used as serial port        J8           Pins 2 & 3
                                                              closed

      Serial port 2 used as IR                 J8           Pins 1 & 2
      connector                                               closed

     Serial port 2 IRQ select IRQ3            J11          Pins 1 & 2
                                                              closed

      Serial port 2 IRQ select IRQ4            J11          Pins 2 & 3
                                                              closed

     Serial port 1 IRQ select IRQ4            J12          Pins 1 & 2
                                                              closed

      Serial port 1 IRQ select IRQ3            J12          Pins 2 & 3
                                                              closed

     Parallel port IRQ select IRQ7            J13          Pins 1 & 2
                                                              closed

      Parallel port IRQ select IRQ5            J13          Pins 2 & 3
                                                              closed

     PS/2 mouse enabled                       J20          Pins 1 & 2
                                                              closed

      PS/2 mouse disabled                      J20          Pins 2 & 3
                                                              closed

      Jumper information unavailable           J23             N/A

      Jumper information unavailable           J24             N/A

      Jumper information unavailable           J25             N/A

      On board video enabled                   J27          Pins 1 & 2
                                                              closed

      On board video disabled                  J27          Pins 2 & 3
                                                              closed

     CMOS memory normal operation             J29             Open

      CMOS memory clear                        J29            Closed

      Jumper information unavailable           J30             N/A

      On board video IRQ enabled               J33            Closed

      On board video IRQ disabled              J33             Open

      Jumper information unavailable           J34             N/A

      Jumper information unavailable           J35             N/A

      Jumper information unavailable           J45             N/A

                        DRAM CONFIGURATION

         Size                 Bank 0                Bank 1

         2MB              (2) 256K x 36              None

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

         8MB               (2) 1M x 36               None

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

         10MB             (2) 256K 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

         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

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

         34MB             (2) 256K 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

         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) 8M x 36            (2) 8M x 36

        128MB              (2) 16M x 36              None

  Note: Board accepts EDO memory. Board also accepts x 32 SIMMs.

                            CACHE CONFIGURATION

               Size                                  SL1

               256KB                              Installed

               512KB                              Installed

  Note: Cache modules can be asynchronous, pipeline burst or synchronous
  burst. Only one module can be installed at SL1.

                        VIDEO MEMORY CONFIGURATION

          Size                    Bank 0                   Bank 1

           1MB                     1MB                      None

           2MB                     1MB                      1MB

  Note: Bank 0 is factory installed and is not configurable. The size of
  the Bank 1 chips are unidentified.

                    CPU SPEED SELECTION

   CPU speed    Clock speed        J46            J48

     75MHz         50MHz           Open          Open

     90MHz         60MHz           Open          Open

    100MHz         50MHz          Closed         Open

    100MHz         66MHz           Open          Open

    120MHz         60MHz          Closed         Open

    133MHz         66MHz          Closed         Open

    150MHz         50MHz           Open         Closed

    150MHz         60MHz          Closed        Closed

    HOST CLOCK SELECTION

  Speed      J21      J22

  50MHz     Closed   Closed

  60MHz     Closed    Open

  66MHz     Open     Closed

                      CPU VOLTAGE SELECTION

             Voltage                           J38

  3.135v - 3.45v (standard CPU)         Pins 1 & 2 closed

     3.45v - 3.6v (VRE CPU)             Pins 2 & 3 closed

                        3.3V POWER SUPPLY SELECTION

        Setting              J39              J40               J47

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

     Power supply        1 & 2, 3 & 4,    1 & 2, 3 & 4,        Open
                            5 & 6            5 & 6

  Note: Pins designated should be in the closed position.

         PCI HOST CLOCK SELECTION

        Speed                J43

        50MHz         Pins 2 & 3 closed

        60MHz         Pins 1 & 2 closed

        66MHz         Pins 1 & 2 closed

