AMERICAN MEGATRENDS, INC.

MEGARUM 758

Processor

Pentium II

Processor Speed

120/133/150/166/180/200/210/233/240/266MHz

Chip Set

Unidentified

Video Chip Set

ATI

Maximum Onboard Memory

1GB (EDO supported)

Maximum Video Memory

2MB

Cache

256/512KB (located on Pentium II CPU)

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit PCI slots (6), floppy drive interface, green PC connector, IDE interfaces (2), SCSI interfaces (2), Wide SCSI interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VGA interface, VRM connectors (2), USB connectors (2), CPU Slot 1s (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse interface

J1

Turbo LED

J33

CPU fan power 1

J2

SCSI interface 1

J36

Parallel port

J3

SCSI interface 2

J37

Floppy drive interface

J4

IDE interface LED

J38

CPU fan power 2

J7

SCSI interface LED

J40

Serial port 2

J8

Power LED & keylock

J41

Serial port 1

J9

Wide SCSI interface 1

J44

IDE interface

J10

Wide SCSI interface 2

J45

IDE interface

J11

Speaker

J46

VGA interface

J16

System override connector

J47

Green PC connector

J18

32-bit PCI slots

PC1 - PC6

USB connector 1

J19

CPU Slot 1

SL1

USB connector 2

J20

CPU Slot 2

SL2

Chassis fan power

J23

VRM connector 1

VRM1

Reset switch

J28

VRM connector 2

VRM2

Chassis intrusion connector

J29

   

Note: The location of J18 is unidentified.

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

C1

Unidentified

»

Factory configured - do not alter

C2

Unidentified

»

Factory configured - do not alter

C3

Unidentified

»

PCI IRQ disabled for onboard PCI VGA

J13

Closed

 

PCI IRQ enabled for onboard PCI VGA

J13

Open

»

On board video enabled

J14

Open

 

On board video disabled

J14

Closed

»

CMOS memory normal operation

J35

Open

 

CMOS memory clear

J35

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

8MB

(2) 1M x 36

None

None

None

16MB

(2) 1M x 36

(2) 1M x 36

None

None

16MB

(2) 2M x 36

None

None

None

24MB

(2) 1M x 36

(2) 1M x 36

(2) 1M x 36

None

32MB

(2) 1M x 36

(2) 1M x 36

(2) 1M x 36

(2) 1M x 36

32MB

(2) 2M x 36

(2) 2M x 36

None

None

32MB

(2) 4M x 36

None

None

None

48MB

(2) 2M x 36

(2) 2M x 36

(2) 2M x 36

None

64MB

(2) 2M x 36

(2) 2M x 36

(2) 2M x 36

(2) 2M x 36

64MB

(2) 4M x 36

(2) 4M x 36

None

None

DRAM CONFIGURATION (CON'T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

64MB

(2) 8M x 36

None

None

None

96MB

(2) 4M x 36

(2) 4M x 36

(2) 4M x 36

None

128MB

(2) 4M x 36

(2) 4M x 36

(2) 4M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

None

None

128MB

(2) 16M x 36

None

None

None

192MB

(2) 8M x 36

(2) 8M x 36

(2) 8M x 36

None

256MB

(2) 8M x 36

(2) 8M x 36

(2) 8M x 36

(2) 8M x 36

256MB

(2) 16M x 36

(2) 16M x 36

None

None

256MB

(2) 32M x 36

None

None

None

384MB

(2) 16M x 36

(2) 16M x 36

(2) 16M x 36

None

512MB

(2) 16M x 36

(2) 16M x 36

(2) 16M x 36

(2) 16M x 36

512MB

(2) 32M x 36

(2) 32M x 36

None

None

768MB

(2) 32M x 36

(2) 32M x 36

(2) 32M x 36

None

1GB

(2) 32M x 36

(2) 32M x 36

(2) 32M x 36

(2) 32M x 36

Note: Board accepts EDO memory. Do not use 16M x 36 SIMMs that have more than 36 chips per SIMM.

CACHE CONFIGURATION

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

CPU SPEED SELECTION

Speed

J21

J24

120MHz

Open

Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8 closed

133MHz

Closed

Pins 1 & 2, 3 & 4, 5 & 6, 7 & 8 closed

150MHz

Open

Pins 3 & 4, 5 & 6, 7 & 8 closed

166MHz

Closed

Pins 3 & 4, 5 & 6, 7 & 8 closed

180MHz

Open

Pins 1 & 2, 5 & 6, 7 & 8 closed

200MHz

Closed

Pins 1 & 2, 5 & 6, 7 & 8 closed

210MHz

Open

Pins 5 & 6, 7 & 8 closed

233MHz

Closed

Pins 5 & 6, 7 & 8 closed

240MHz

Open

Pins 1 & 2, 3 & 4, 7 & 8 closed

266MHz

Closed

Pins 1 & 2, 3 & 4, 7 & 8 closed

CPU VOLTAGE SELECTION

Voltage

J5

J15

 

1.8v

1 & 2, 3 & 4, 7 & 8

1 & 2, 3 & 4, 7 & 8

 

1.85v

1 & 2, 3 & 4, 7 & 8, 9 & 10

1 & 2, 3 & 4, 7 & 8, 9 & 10

 

1.9v

1 & 2, 3 & 4, 5 & 6

1 & 2, 3 & 4, 5 & 6

 

1.95v

1 & 2, 3 & 4, 5 & 6, 9 & 10

1 & 2, 3 & 4, 5 & 6, 9 & 10

 

2.0v

1 & 2, 3 & 4, 5 & 6, 7 & 8

1 & 2, 3 & 4, 5 & 6, 7 & 8

 

2.05v

1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10

1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10

 

2.1v

9 & 10

9 & 10

 

2.2v

7 & 8

7 & 8

 

2.3v

7 & 8, 9 & 10

7 & 8, 9 & 10

 

2.4v

5 & 6

5 & 6

 

2.5v

5 & 6, 9 & 10

5 & 6, 9 & 10

 

2.6v

5 & 6, 7 & 8

5 & 6, 7 & 8

 

2.7v

5 & 6, 7 & 8, 9 & 10

5 & 6, 7 & 8, 9 & 10

 

2.8v

3 & 4

3 & 4

 

2.9v

3 & 4, 9 & 10

3 & 4, 9 & 10

 

3.0v

3 & 4, 7 & 8

3 & 4, 7 & 8

 

3.1v

3 & 4, 7 & 8, 9 & 10

3 & 4, 7 & 8, 9 & 10

 

3.2v

3 & 4, 5 & 6

3 & 4, 5 & 6

»

3.3v

3 & 4, 5 & 6, 9 & 10

3 & 4, 5 & 6, 9 & 10

 

3.4v

3 & 4, 5 & 6, 7 & 8

3 & 4, 5 & 6, 7 & 8

 

3.5v

3 & 4, 5 & 6, 7 & 8, 9 & 10

3 & 4, 5 & 6, 7 & 8, 9 & 10

Note: Pins designated should be in the closed position. J5 controls Slot 1 & J15 controls Slot 2.