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J-656VXB Motherboard Settings and Configuration






J-MARK COMPUTER CORPORATION

J-656VXB

Processor

CX M1/AM K5/Pentium

Processor Speed

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

Chip Set

Intel

Video Chip Set

None

Maximum Onboard Memory

128MB (EDO supported)

Maximum Video Memory

None

Cache

256/512KB

BIOS

Award

Dimensions

270mm x 220mm

I/O Options

32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), cache slot, IR connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

IDE interface LED

JC5

Serial port 2

CN2

Power LED & keylock

JC6

Parallel port

CN3

Turbo switch

JC7

Floppy drive interface

CN4

Green PC connector

JC8

IDE interface 2

CN5

IR connector

JP12

IDE interface 1

CN6

Chassis fan power

JP21

PS/2 mouse interface

J1

External battery

JP23

Speaker

JC2

32-bit PCI slots

PC1 – PC3

Reset switch

JC3

Cache slot

SL1

Turbo LED

JC4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

J4

Unidentified

»

Factory configured - do not alter

JP3

Unidentified

 

PCICLK select PCICLK/4

JP22

Closed

 

PCICLK select PCICLK/3

JP22

Open

 

PS/2 IRQ12 enabled

JP29

Closed

 

PS/2 IRQ12 disabled

JP29

Open

 

Flash BIOS voltage select 12v

JP33

Pins 1 & 2 closed

 

Flash BIOS voltage select 5v

JP33

Pins 2 & 3 closed

DIMM/DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

8MB

(2) 1M x 36

None

None

8MB

None

None

(1) 1M x 64

16MB

(2) 2M x 36

None

None

16MB

(2) 1M x 36

(2) 1M x 36

None

16MB

None

None

(1) 2M x 64

24MB

(2) 2M x 36

(2) 1M x 36

None

32MB

(2) 4M x 36

None

None

32MB

(2) 2M x 36

(2) 2M x 36

None

32MB

None

None

(1) 4M x 64

40MB

(2) 4M x 36

(2) 1M x 36

None

48MB

(2) 4M x 36

(2) 2M x 36

None

DIMM/DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

64MB

(2) 8M x 36

None

None

64MB

(2) 4M x 36

(2) 4M x 36

None

72MB

(2) 8M x 36

(2) 1M x 36

None

80MB

(2) 8M x 36

(2) 2M x 36

None

96MB

(2) 8M x 36

(2) 4M x 36

None

128MB

(2) 8M x 36

(2) 8M x 36

None

Note: Board accepts EDO memory.

CACHE CONFIGURATION

Size

Bank 0

SL1

TAG

256KB (A)

(2) 32K x 32

Not installed

(1) 32K x 8

256KB (B)

None

256KB module installed

(1) 32K x 8

512KB (A)

(2) 32K x 32

256KB module installed

(1) 32K x 8

512KB (B)

None

512KB module installed

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP1

JP2

JP7

JP8

256KB (A)

1 & 2

1 & 2

1 & 2

1 & 2

256KB (B)

1 & 2

1 & 2

1 & 2

1 & 2

512KB (A, Jet-Way module)

2 & 3

1 & 2

2 & 3

1 & 2

512KB (A, Intel module)

1 & 2

2 & 3

1 & 2

2 & 3

512KB (B, Jet-Way module)

2 & 3

1 & 2

2 & 3

1 & 2

512KB (B, Intel module)

1 & 2

2 & 3

1 & 2

2 & 3

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (CYRIX)

CPU speed

Clock speed

Multiplier

J5

JP13

JP14

120MHz

50MHz

2x

3 & 4, 5 & 6

Closed

Open

133MHz

55MHz

2x

3 & 4

Closed

Open

150MHz

60MHz

2x

5 & 6

Closed

Open

166MHz

66MHz

2x

Open

Closed

Open

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (AMD)

CPU speed

Clock speed

Multiplier

J5

JP13

JP14

90MHz

60MHz

1.5x

5 & 6

Open

Open

100MHz

66MHz

1.5x

Open

Open

Open

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

Multiplier

J5

JP13

JP14

75MHz

50MHz

1.5x

3 & 4, 5 & 6

Open

Open

90MHz

60MHz

1.5x

5 & 6

Open

Open

100MHz

66MHz

1.5x

Open

Open

Open

120MHz

60MHz

2x

5 & 6

Closed

Open

133MHz

66MHz

2x

Open

Closed

Open

150MHz

60MHz

2.5x

5 & 6

Closed

Closed

166MHz

66MHz

2.5x

Open

Closed

Closed

200MHz

66MHz

3x

Open

Open

Closed

Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION (SINGLE)

Voltage

JP24

JP25

JP26

3.3v

Closed

Open

Open

3.45v

Open

Closed

Open

3.52v

Open

Open

Closed

CPU VOLTAGE SELECTION (DUAL)

Voltage

V core

J11

J12

J13

JP24

JP25

JP26

3.3v

2.5v

Closed

Open

Open

Closed

Open

Open

3.3v

2.8v

Open

Closed

Open

Open

Closed

Open

3.3v

3.45v

Open

Open

Closed

Open

Open

Closed

3.45v

2.5v

Closed

Open

Open

Closed

Open

Open

3.45v

2.8v

Open

Closed

Open

Open

Closed

Open

3.45v

3.45v

Open

Open

Closed

Open

Open

Closed

3.52v

2.5v

Closed

Open

Open

Closed

Open

Open

3.52v

2.8v

Open

Closed

Open

Open

Closed

Open

3.52v

3.45v

Open

Open

Closed

Open

Open

Closed

MOS

CMOS SELECTION

Setting

JP23

JP35

»

CMOS memory normal operation

Pins 2 & 3 closed

Open

 

CMOS memory clear

Pins 3 & 4 closed

Closed








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