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MEGARUM 758

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.