J-MARK COMPUTER CORPORATION

J-591A

Device Type

Mainboard

Processor

CX 6X86/IBM 6X86/CX 686MX/IDT C6/AM K5/AM K6/Pentium/Pentium MMX

Processor Speed

90/100/120/133/150/166/180/200/233/266/300MHz

Chip Set

SIS 5591

Maximum Onboard Memory

256MB (EDO & SDRAM supported)

Cache

512KB

BIOS

Unidentified

Dimensions

235mm x 220mm

I/O Options

32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), IR connector, USB connector, ATX power connector, AGP slot

CONNECTIONS

Purpose

Location

Purpose

Location

AGP slot

AGP

Serial port 2

CN1

ATX power connector

ATX

Serial port 1

CN2

Turbo LED

C1

IDE interface 2

CN3

Reset switch

C2

IDE interface 1

CN4

Speaker

C3

Floppy drive interface

CN5

Turbo switch

C4

Parallel port

CN6

Power LED & keylock

C5

IR connector

IR1

IDE interface LED

C6

PS/2 mouse interface

JP1

Soft off power supply

C7

32-bit PCI slots

PC1 PC3

Chassis fan power

C8

USB connector

USB

CPU fan power

C9

SCSI interface

 

USER CONFIGURABLE SETTINGS

Function

Label

Position

Keyboard power on disabled

JP2

Pins 2 & 3 closed

 

Keyboard power on enabled

JP2

Pins 1 & 2 closed

CMOS memory normal operation

JP4

Pins 1 & 2 closed

 

CMOS memory clear

JP4

Pins 2 & 3 closed

Factory configured - do not alter

JP8

Unidentified

Factory configured - do not alter

JP9

Unidentified

SIMM CONFIGURATION

Size

Bank 0

8MB

(2) 1M x 36

16MB

(2) 2M x 36

32MB

(2) 4M x 36

64MB

(2) 8M x 36

128MB

(2) 16M x 36

256MB

(2) 32M x 36

Note: Board accepts EDO memory.

DIMM CONFIGURATION

Size

Bank 1

Bank 2

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) 8M x 64

None

64MB

(1) 4M x 64

(1) 4M x 64

72MB

(1) 8M x 64

(1) 1M x 64

80MB

(1) 8M x 64

(1) 2M x 64

96MB

(1) 8M x 64

(1) 4M x 64

128MB

(1) 16M x 64

None

128MB

(1) 8M x 64

(1) 8M x 64

136MB

(1) 16M x 64

(1) 1M x 64

144MB

(1) 16M x 64

(1) 2M x 64

160MB

(1) 16M x 64

(1) 4M x 64

192MB

(1) 16M x 64

(1) 8M x 64

256MB

(1) 16M x 64

(1) 16M x 64

Note: Board accepts SDRAM memory.

CACHE CONFIGURATION

Size

Bank 0

TAG

512KB

(1) 64K x 64

(1) 32K x 8

CPU SPEED SELECTION (CX 6X86)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

150MHz

60MHz

2x

On

Off

Off

On

On

On

166MHz

66MHz

2x

On

Off

Off

Off

On

On

200MHz

75MHz

2x

On

Off

Off

On

On

Off

CPU SPEED SELECTION (IBM 6X86)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

150MHz

60MHz

2x

On

Off

Off

On

On

On

166MHz

66MHz

2x

On

Off

Off

Off

On

On

200MHz

75MHz

2x

On

Off

Off

On

On

Off

CPU SPEED SELECTION (CX 6X86MX)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

166MHz

60MHz

2.5x

On

On

Off

Off

On

On

200MHz

66MHz

2.5x

On

On

Off

Off

On

On

200MHz

75MHz

2x

On

Off

Off

Off

On

Off

233MHz

66MHz

3x

Off

On

Off

On

On

On

233MHz

75MHz

2.5x

On

On

Off

On

On

Off

CPU SPEED SELECTION (IDT C6)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

150MHz

75MHz

2x

On

Off

Off

On

On

Off

180MHz

60MHz

3x

Off

On

Off

On

On

On

CPU SPEED SELECTION (AM K5)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

90MHz

60MHz

1.5x

Off

Off

Off

On

On

On

100MHz

66MHz

1.5x

Off

Off

Off

Off

On

On

133MHz

66MHz

1.5x

Off

Off

Off

Off

On

On

166MHz

66MHz

2.5x

On

On

Off

Off

On

On

CPU SPEED SELECTION (AM K6)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

166MHz

66MHz

2.5x

On

On

Off

Off

On

On

200MHz

66MHz

3x

Off

On

Off

Off

On

On

233MHz

66MHz

3.5x

Off

Off

Off

Off

On

On

266MHz

66MHz

4x

On

Off

On

Off

On

On

300MHz

66MHz

4.5x

On

On

On

Off

On

Off

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

90MHz

60MHz

1.5x

Off

Off

Off

On

On

On

100MHz

66MHz

1.5x

Off

Off

Off

Off

On

On

120MHz

60MHz

2x

On

Off

Off

On

On

On

133MHz

66MHz

2x

On

Off

Off

Off

On

On

150MHz

60MHz

2.5x

On

On

Off

On

On

On

166MHz

66MHz

2.5x

On

On

Off

Off

On

On

200MHz

66MHz

3x

Off

On

Off

Off

On

On

CPU SPEED SELECTION (INTEL MMX)

CPU speed

Clock speed

Multiplier

U4/1

U4/2

U4/3

U4/4

U4/5

U4/6

166MHz

66MHz

2.5x

On

On

Off

Off

On

On

200MHz

66MHz

3x

Off

On

Off

Off

On

On

233MHz

66MHz

3.5x

Off

Off

Off

Off

On

On

CPU VOLTAGE SELECTION

Voltage

JP10

2.2v

Pins 1 & 2 closed

2.8v

Pins 3 & 4 closed

2.9v

Pins 5 & 6 closed

3.2v

Pins 7 & 8 closed

3.3v

Pins 9 & 10 closed

3.45v

Pins 11 & 12 closed

3.52v

Pins 13 & 14 closed