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# 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
IMG IMG 1
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+