ANTEC, INC.

MB557

Processor

CX M1/IBM/AM K5/AM K6/Pentium

Processor Speed

75/90/100/120/125/133/150/166/200MHz

Chip Set

Intel

Video Chip Set

None

Maximum Onboard Memory

128MB (EDO supported)

Maximum Video Memory

1MB

Cache

256/512KB

BIOS

Award

Dimensions

280mm x 220mm

I/O Options

32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), cache slot, IR connector, USB connectors (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Floppy drive interface

CN1

PS/2 mouse interface

J99

Serial port 1

CN2

Chassis fan power

JP1

Serial port 2

CN3

IR connector

JP3

Parallel port

CN4

Reset switch

JP12

IDE interface 1

J6

Green PC connector

JP15

IDE interface 2

J7

IDE interface LED

JP22

USB connector

J10

Green PC LED

JP33

USB connector

J11

32-bit PCI slots

PC1 – PC4

Speaker

J12

Cache slot

SL1

Power LED & keylock

J14

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Monitor type select CGA40/CGA80

JP7

Closed

 

Monitor type select monochrome

JP7

Open

 

Monitor type select color

JP7

Any setting

»

Password normal operation

JP9

Open

 

Password clear

JP9

Closed

 

Flash BIOS voltage select 12v

JP19

Pins 1 & 2 closed

 

Flash BIOS voltage select 5v

JP19

Pins 2 & 3 closed

»

CMOS memory normal operation

JP21

Open

 

CMOS memory clear

JP21

Closed

»

Factory configured - do not alter

JP39

Pins 2 & 3 closed

»

Factory configured - do not alter

JP43

Closed

»

Factory configured - do not alter

JP44

Open

Note: If Cyrix 6x86 or AMD K5 processor is installed, JP9 is not available.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 36

None

16MB

(2) 2M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 4M x 36

None

32MB

(2) 2M x 36

(2) 2M x 36

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 8M x 36

None

64MB

(2) 4M x 36

(2) 4M x 36

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

72MB

(2) 8M x 36

(2) 1M x 36

80MB

(2) 8M x 36

(2) 2M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

Note: Board accepts EDO memory. Banks are interchangeable. Do not install SIMMs & DIMMs at the same time.

DIMM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(1) 1M x 64

None

16MB

(1) 2M x 64

None

16MB

(1) 1M x 64

(1) 1M x 64

24MB

(1) 2M x 64

(1) 1M x 64

32MB

(1) 4M x 64

None

32MB

(1) 2M x 64

(1) 2M x 64

40MB

(1) 4M x 64

(1) 1M x 64

48MB

(1) 4M x 64

(1) 2M x 64

64MB

(1) 4M x 64

(1) 4M x 64

CACHE CONFIGURATION

Size

Bank 0

SL1

256KB

(2) 32K x 32

Not installed

512KB

(2) 32K x 32

256KB module installed

CACHE JUMPER CONFIGURATION

Size

JP29

JP30

256KB

Pins 2 & 3 closed

Pins 2 & 3 closed

512KB

Pins 1 & 2 closed

Pins 1 & 2 closed

CPU SPEED SELECTION (CYRIX)

CPU speed

Clock speed

Multiplier

JP23

JP24

JP36

120MHz

50MHz

2x

1 & 2

2 & 3

1 & 2, 3 & 4, 5 & 6

133MHz

55MHz

2x

1 & 2

2 & 3

1 & 2, 5 & 6

150MHz

60MHz

2x

1 & 2

2 & 3

1 & 2, 3 & 4

166MHz

66MHz

2x

1 & 2

2 & 3

3 & 4, 5 & 6

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (IBM)

CPU speed

Clock speed

Multiplier

JP23

JP24

JP36

120MHz

50MHz

2x

1 & 2

2 & 3

1 & 2, 3 & 4, 5 & 6

133MHz

55MHz

2x

1 & 2

2 & 3

1 & 2, 5 & 6

150MHz

60MHz

2x

1 & 2

2 & 3

1 & 2, 3 & 4

166MHz

66MHz

2x

1 & 2

2 & 3

3 & 4, 5 & 6

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (AMD)

CPU speed

Clock speed

Multiplier

JP23

JP24

JP36

75MHz

50MHz

1.5x

2 & 3

2 & 3

1 & 2, 3 & 4, 5 & 6

90MHz

60MHz

1.5x

2 & 3

2 & 3

1 & 2, 3 & 4

100MHz

66MHz

1.5x

2 & 3

2 & 3

3 & 4, 5 & 6

120MHz

60MHz

1.5x

2 & 3

2 & 3

1 & 2, 3 & 4

133MHz

66MHz

1.5x

2 & 3

2 & 3

3 & 4, 5 & 6

150MHz

60MHz

1.75x

1 & 2

1 & 2

1 & 2, 3 & 4

166MHz

66MHz

1.75x

1 & 2

1 & 2

3 & 4, 5 & 6

166MHz

66MHz

2.5x

1 & 2

1 & 2

3 & 4, 5 & 6

200MHz

66MHz

3x

2 & 3

1 & 2

3 & 4, 5 & 6

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

Multiplier

JP23

JP24

JP36

75MHz

50MHz

1.5x

2 & 3

2 & 3

1 & 2, 3 & 4, 5 & 6

90MHz

60MHz

1.5x

2 & 3

2 & 3

1 & 2, 3 & 4

100MHz

66MHz

1.5x

2 & 3

2 & 3

3 & 4, 5 & 6

120MHz

60MHz

2x

1 & 2

2 & 3

1 & 2, 3 & 4

125MHz

50MHz

2.5x

1 & 2

1 & 2

1 & 2, 3 & 4, 5 & 6

133MHz

66MHz

2x

1 & 2

2 & 3

3 & 4, 5 & 6

150MHz

60MHz

2.5x

1 & 2

1 & 2

1 & 2, 3 & 4

166MHz

66MHz

2.5x

1 & 2

1 & 2

3 & 4, 5 & 6

200MHz

66MHz

3x

2 & 3

1 & 2

3 & 4, 5 & 6

Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION (SINGLE)

Voltage

J100

J105

J107

J108

2.82v

Open

3 & 4

Open

1 & 3, 2 & 4

2.94v

2 & 4

3 & 4

Open

1 & 3, 2 & 4

3.10v

3 & 4

3 & 4

Open

1 & 3, 2 & 4

3.33v

1 & 3

3 & 4

Open

1 & 3, 2 & 4

3.53v

1 & 3, 2 & 4

3 & 4

Open

1 & 3, 2 & 4

Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION (DUAL)

Voltage

V core

J100

J105

J107

J108

3.33v

2.82v

Open

3 & 4

1 & 3, 2 & 4

Open

3.33v

2.94v

2 & 4

3 & 4

1 & 3, 2 & 4

Open

3.33v

3.10v

3 & 4

3 & 4

1 & 3, 2 & 4

Open

3.44v

2.82v

Open

2 & 4

1 & 3, 2 & 4

Open

3.44v

2.94v

2 & 4

2 & 4

1 & 3, 2 & 4

Open

3.44v

3.10v

3 & 4

2 & 4

1 & 3, 2 & 4

Open

Note: Pins designated should be in the closed position.