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MB6831A

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

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 connector

J46

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.