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  512MB (EDO & SDRAM supported)                 
   Memory           
   Maximum Video    None                                          
   Memory           
   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 

<gopher://bitreich.org/I/th99/m/A-B/35710-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | AGP slot          |   AGP    | USB connector 1  |   J33    |
   |-------------------+----------+------------------+----------|
   | ATX power         |   ATX    | USB connector 2  |   J34    |
   | connector         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | 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      |   JP28   |
   |                   |          | power            |          |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   J22    | CPU fan power    |   JP29   |
   | interface         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | PS/2 mouse port   |   J24    | 32-bit PCI slots |  PC1 -   |
   |                   |          |                  |   PC4    |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J27    | Soft off power   |    S1    |
   | keylock           |          | supply           |          |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   J32    | IDE interface    |    S3    |
   |                   |          | LED              |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 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  |    None    |
   |      |             |             |     64     |            |
   |------+-------------+-------------+------------+------------|
   | 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  |  (1) 1M x  |
   |      |             |             |     64     |     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  |    None    |
   |      |             |             |     64     |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DIMM CONFIGURATION (CON'T)                 |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (1) 2M x 64 |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
   |       |             |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (1) 8M x 64 |    None    |    None    |    None    |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (1) 4M x 64 |  (1) 4M x  |    None    |    None    |
   |       |             |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 72MB  | (1) 8M x 64 |  (1) 1M x  |    None    |    None    |
   |       |             |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 80MB  | (1) 8M x 64 |  (1) 2M x  |    None    |    None    |
   |       |             |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 96MB  | (1) 8M x 64 |  (1) 4M x  |    None    |    None    |
   |       |             |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 96MB  | (1) 4M x 64 |  (1) 4M x  |  (1) 4M x  |    None    |
   |       |             |     64     |     64     |            |
   |-------+-------------+------------+------------+------------|
   | 128MB |  (1) 16M x  |    None    |    None    |    None    |
   |       |     64      |            |            |            |
   |-------+-------------+------------+------------+------------|
   | 128MB | (1) 8M x 64 |  (1) 8M x  |    None    |    None    |
   |       |             |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 128MB | (1) 4M x 64 |  (1) 4M x  |  (1) 4M x  |  (1) 4M x  |
   |       |             |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 136MB |  (1) 16M x  |  (1) 1M x  |    None    |    None    |
   |       |     64      |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 144MB |  (1) 16M x  |  (1) 2M x  |    None    |    None    |
   |       |     64      |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 176MB |  (1) 16M x  |  (1) 2M x  |  (1) 2M x  |  (1) 2M x  |
   |       |     64      |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 192MB |  (1) 16M x  |  (1) 8M x  |    None    |    None    |
   |       |     64      |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 192MB | (1) 8M x 64 |  (1) 8M x  |  (1) 8M x  |    None    |
   |       |             |     64     |     64     |            |
   |-------+-------------+------------+------------+------------|
   | 256MB |  (1) 16M x  | (1) 16M x  |    None    |    None    |
   |       |     64      |     64     |            |            |
   |-------+-------------+------------+------------+------------|
   | 256MB | (1) 8M x 64 |  (1) 8M x  |  (1) 8M x  |  (1) 8M x  |
   |       |             |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 272MB |  (1) 16M x  | (1) 16M x  |  (1) 1M x  |  (1) 1M x  |
   |       |     64      |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 288MB |  (1) 16M x  | (1) 16M x  |  (1) 2M x  |  (1) 2M x  |
   |       |     64      |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 320MB |  (1) 16M x  | (1) 16M x  |  (1) 4M x  |  (1) 4M x  |
   |       |     64      |     64     |     64     |     64     |
   |-------+-------------+------------+------------+------------|
   | 384MB |  (1) 16M x  | (1) 16M x  | (1) 16M x  |    None    |
   |       |     64      |     64     |     64     |            |
   |-------+-------------+------------+------------+------------|
   | 512MB |  (1) 16M x  | (1) 16M x  | (1) 16M x  | (1) 16M x  |
   |       |     64      |     64     |     64     |     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.    |
   +------------------------------------------------------------+