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J-656C Motherboard Settings and Configuration






J-MARK COMPUTER CORPORATION

J-656C

Processor

CX M1/Pentium

Processor Speed

75/90/100/120/133/150/166/180/200MHz

Chip Set

Intel

Video Chip Set

None

Maximum Onboard Memory

128MB (EDO supported)

Maximum Video Memory

None

Cache

256/512KB

BIOS

Award

Dimensions

255mm x 220mm

I/O Options

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

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface 2

J1

IDE interface LED

JP6 pins 14 & 15

IDE interface 1

J2

Turbo switch

JP6 pins 18 & 19

Serial port 2

J7

Reset switch

JP6 pins 22 & 23

Serial port 1

J8

Turbo LED

JP6 pins 25 & 26

Floppy drive interface

J9

Parallel port

JP15

Power LED & keylock

JP6 pins 1 - 5

32-bit PCI slots

PC1 PC4

Green PC connector

JP6 pins 7 & 8

PS/2 mouse interface

PS2

Speaker

JP6 pins 10 - 13

Cache slot

SL1

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter

J5

Unidentified

CMOS memory normal operation

JP3

Open

 

CMOS memory clear

JP3

Closed

 

Flash BIOS voltage select 12v

JP5

Pins 1 & 2 closed

 

Flash BIOS voltage select 5v

JP5

Pins 2 & 3 closed

ISA clock select PCI CLK/4

JP8

Pins 2 & 3 closed

 

ISA clock select PCI CLK/3

JP8

Pins 1 & 2 closed

Factory configured - do not alter

JP13

Unidentified

Factory configured - do not alter

JV1

Unidentified

Factory configured - do not alter

JW1

Unidentified

Factory configured - do not alter

JW2

Unidentified

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

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. Board also accepts x 32 SIMMs.

Banks are interchangeable at 64MB and above.

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

JC1

JC2

JT2

JX2

256KB (A)

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

256KB (B)

N/A

N/A

N/A

N/A

512KB (A)

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

512KB (B)

N/A

N/A

N/A

N/A

CACHE TYPE CONFIGURATION

Type

JP101

Asynchronous

Closed

Synchronous

Open

CPU SPEED SELECTION (CYRIX)

CPU speed

Clock speed

Multiplier

JF1

J1

J3

120MHz

50MHz

2x

3 & 4

Closed

Open

150MHz

60MHz

2x

1 & 2

Closed

Open

166MHz

66MHz

2x

Open

Closed

Open

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

Multiplier

JF1

J1

J3

75MHz

50MHz

1.5x

3 & 4

Open

Open

90MHz

60MHz

1.5x

1 & 2

Open

Open

100MHz

66MHz

1.5x

Open

Open

Open

120MHz

60MHz

2x

1 & 2

Closed

Open

133MHz

66MHz

2x

Open

Closed

Open

150MHz

60MHz

2.5x

1 & 2

Closed

Closed

166MHz

66MHz

2.5x

Open

Closed

Closed

180MHz

60MHz

3x

1 & 2

Open

Closed

200MHz

66MHz

3x

Open

Open

Closed

Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION

Voltage

JV2

 

3.3v

Pins 1 & 2 closed

3.45v

Pins 3 & 4 closed

 

3.6v

Pins 5 & 6 closed

CPU CLOCK TOLERANCE SELECTION

Tolerance

JP7

 

3.3v

Pins 2 & 3 closed

5v

Pins 1 & 2 closed








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