ANTEC, INC.

MB6831A

Device Type              Mainboard
Processor                Pentium II
Processor Speed          233/266/300/333MHz
Chip Set                 Intel 440LX
Video Chip Set           None
Maximum Onboard Memory   512MB (EDO & SDRAM supported)
Maximum Video Memory     None
Cache                    256/512KB (located on Pentium II CPU)
BIOS                     Award
Dimensions               305mm x 170mm
I/O Options              32-bit PCI slots (4), floppy drive interface, IDE
                         interfaces (2), parallel port, PS/2 mouse port,
                         serial ports (2), IR connector, USB connectors
                         (2), ATX power connector, AGP slot

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  AGP slot                   AGP       USB connector 1            J33

  ATX power connector        ATX       USB connector 2            J34

  IDE interface 1            J13       AGP fan power              J43

  IDE interface 2            J14       EISCA coller               J46
                                       connector

  Parallel port              J19       IR connector               JP4

  Serial port 1              J20       Speaker                    JP24

  Serial port 2              J21       Chassis fan power          JP28

  Floppy drive interface     J22       CPU fan power              JP29

  PS/2 mouse port            J24       32-bit PCI slots         PC1 – PC4

  Power LED & keylock        J27       Soft off power supply       S1

  Reset switch               J32       IDE interface LED           S3

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Flash BIOS voltage select 12v           J17           Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 5v            J17           Pins 2 & 3
                                                              closed

  »   CMOS memory normal operation            JP19          Pins 1 & 2
                                                              closed

      CMOS memory clear                       JP19          Pins 2 & 3
                                                              closed

      Any hard drive installed                JP32          Pins 1 & 2
                                                              closed

      Seagate 5v hard drive installed         JP32          Pins 2 & 3
                                                              closed

                           DIMM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

     16MB       (1) 2M x 64       None           None          None

     16MB       (1) 1M x 64   (1) 1M x 64        None          None

     24MB       (1) 2M x 64   (1) 1M x 64        None          None

     24MB       (1) 1M x 64   (1) 1M x 64    (1) 1M x 64       None

     32MB       (1) 4M x 64       None           None          None

     32MB       (1) 2M x 64   (1) 2M x 64        None          None

     32MB       (1) 1M x 64   (1) 1M x 64    (1) 1M x 64    (1) 1M x 64

     40MB       (1) 4M x 64   (1) 1M x 64        None          None

     48MB       (1) 4M x 64   (1) 2M x 64        None          None

     48MB       (1) 2M x 64   (1) 2M x 64    (1) 2M x 64       None

                        DIMM CONFIGURATION (CON’T)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     64MB        (1) 2M x 64   (1) 2M x 64    (1) 2M x 64    (1) 2M x 64

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

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

     72MB        (1) 8M x 64   (1) 1M x 64        None           None

     80MB        (1) 8M x 64   (1) 2M x 64        None           None

     96MB        (1) 8M x 64   (1) 4M x 64        None           None

     96MB        (1) 4M x 64   (1) 4M x 64    (1) 4M x 64        None

     128MB       (1) 16M x 64      None           None           None

     128MB       (1) 8M x 64   (1) 8M x 64        None           None

     128MB       (1) 4M x 64   (1) 4M x 64    (1) 4M x 64    (1) 4M x 64

     136MB       (1) 16M x 64  (1) 1M x 64        None           None

     144MB       (1) 16M x 64  (1) 2M x 64        None           None

     176MB       (1) 16M x 64  (1) 2M x 64    (1) 2M x 64    (1) 2M x 64

     192MB       (1) 16M x 64  (1) 8M x 64        None           None

     192MB       (1) 8M x 64   (1) 8M x 64    (1) 8M x 64        None

     256MB       (1) 16M x 64  (1) 16M x 64       None           None

     256MB       (1) 8M x 64   (1) 8M x 64    (1) 8M x 64    (1) 8M x 64

     272MB       (1) 16M x 64  (1) 16M x 64   (1) 1M x 64    (1) 1M x 64

     288MB       (1) 16M x 64  (1) 16M x 64   (1) 2M x 64    (1) 2M x 64

     320MB       (1) 16M x 64  (1) 16M x 64   (1) 4M x 64    (1) 4M x 64

     384MB       (1) 16M x 64  (1) 16M x 64   (1) 16M x 64       None

     512MB       (1) 16M x 64  (1) 16M x 64   (1) 16M x 64   (1) 16M x 64

  Note: Board accepts EDO & SDRAM memory.

                     CACHE CONFIGURATION

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

                            CPU SPEED SELECTION

   CPU speed    Clock speed       Multiplier        JP35          JP37

    233MHz         66MHz             3.5x           Open       1 & 2, 5 &
                                                                   6

    266MHz         66MHz              4x            Open       3 & 4, 5 &
                                                                6, 7 & 8

    300MHz         66MHz             4.5x           Open       3 & 4, 5 &
                                                                   6

    333MHz         66MHz              5x            Open       5 & 6, 7 &
                                                                   8

  Note: Pins designated should be in the closed position.