J-MARK COMPUTER CORPORATION

J-7XA

Device Type

Mainboard

Processor

Pentium II

Processor Speed

233/266/300/333MHz

Chip Set

Intel 440LX

Maximum Onboard Memory

768MB (EDO & SDRAM supported)

Cache

256/512KB (located on Pentium II CPU)

BIOS

Award

Dimensions

305mm x 170mm

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), IR connector, USB connectors (2), ATX power connector, AGP slot, SB-link connector

CONNECTIONS

Purpose

Location

Purpose

Location

AGP slot

AGP

IDE interface 1

CN1

ATX power connector

ATX

IDE interface 2

CN2

Speaker

C1

Floppy drive interface

CN3

Reset switch

C2

USB connector 1

CN4

Turbo LED

C3

USB connector 2

CN5

Power LED & keylock

C4

Serial port 2

CN6

Turbo switch

C5

Serial port 1

CN7

IDE interface LED

C6/pins 1 & 3

PS/2 mouse port

J2

Green PC connector

C6/pins 2 & 4

Parallel port

J6

Soft off power supply

C7/pins 2 & 4

IR connector

J7

Chassis fan power

C8

SB-link connector

JP7

CPU fan power

C9

32-bit PCI slots

PC1 - PC4

Chassis fan power

C10

 

 


USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

JERP

Unidentified

»

Factory configured - do not alter

JP1

Unidentified

»

Factory configured - do not alter

JP4

Unidentified

»

Factory configured - do not alter

JP6

Unidentified

»

Factory configured - do not alter

JP8

Unidentified

»

Factory configured - do not alter

JP9

Unidentified

»

Factory configured - do not alter

JP10

Unidentified

»

Factory configured - do not alter

JP11

Unidentified

»

CMOS memory normal operation

RTC

Pins 2 & 3 closed

 

CMOS memory clear

RTC

Pins 3 & 4 closed

 

Battery type select external

RTC

Closed

»

Factory configured - do not alter

U19/8

Off


DIMM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

16MB

(1) 2M x 64

None

None

16MB

(1) 1M x 64

(1) 1M x 64

None

24MB

(1) 2M x 64

(1) 1M x 64

None

24MB

(1) 1M x 64

(1) 1M x 64

(1) 1M x 64

32MB

(1) 4M x 64

None

None

32MB

(1) 2M x 64

(1) 1M x 64

(1) 1M x 64

32MB

(1) 2M x 64

(1) 2M x 64

None

40MB

(1) 4M x 64

(1) 1M x 64

None

40MB

(1) 2M x 64

(1) 2M x 64

(1) 1M x 64

48MB

(1) 4M x 64

(1) 1M x 64

(1) 1M x 64

48MB

(1) 4M x 64

(1) 2M x 64

None


DIMM CONFIGURATION (CON'T)

Size

Bank 0

Bank 1

Bank 2

48MB

(1) 2M x 64

(1) 2M x 64

(1) 2M x 64

56MB

(1) 4M x 64

(1) 2M x 64

(1) 1M x 64

64MB

(1) 8M x 64

None

None

64MB

(1) 4M x 64

(1) 2M x 64

(1) 2M x 64

64MB

(1) 4M x 64

(1) 4M x 64

None

72MB

(1) 8M x 64

(1) 1M x 64

None

72MB

(1) 4M x 64

(1) 4M x 64

(1) 1M x 64

80MB

(1) 8M x 64

(1) 1M x 64

(1) 1M x 64

80MB

(1) 8M x 64

(1) 2M x 64

None

80MB

(1) 4M x 64

(1) 4M x 64

(1) 2M x 64

88MB

(1) 8M x 64

(1) 2M x 64

(1) 1M x 64

96MB

(1) 8M x 64

(1) 2M x 64

(1) 2M x 64

128MB

(1) 16M x 64

None

None

128MB

(1) 8M x 64

(1) 4M x 64

(1) 4M x 64

128MB

(1) 8M x 64

(1) 8M x 64

None

144MB

(1) 8M x 64

(1) 8M x 64

(1) 2M x 64

152MB

(1) 16M x 64

(1) 2M x 64

(1) 1M x 64

160MB

(1) 16M x 64

(1) 2M x 64

(1) 2M x 64

160MB

(1) 16M x 64

(1) 4M x 64

None

160MB

(1) 8M x 64

(1) 8M x 64

(1) 4M x 64

168MB

(1) 16M x 64

(1) 4M x 64

(1) 1M x 64

176MB

(1) 16M x 64

(1) 4M x 64

(1) 2M x 64

192MB

(1) 16M x 64

(1) 4M x 64

(1) 4M x 64

192MB

(1) 8M x 64

(1) 8M x 64

(1) 8M x 64

256MB

(1) 32M x 64

None

None

256MB

(1) 16M x 64

(1) 8M x 64

(1) 8M x 64

264MB

(1) 32M x 64

(1) 1M x 64

None

272MB

(1) 32M x 64

(1) 1M x 64

(1) 1M x 64

272MB

(1) 32M x 64

(1) 2M x 64

None

288MB

(1) 32M x 64

(1) 2M x 64

(1) 2M x 64

288MB

(1) 32M x 64

(1) 4M x 64

None

320MB

(1) 32M x 64

(1) 4M x 64

(1) 4M x 64

320MB

(1) 32M x 64

(1) 8M x 64

None

384MB

(1) 32M x 64

(1) 8M x 64

(1) 8M x 64

384MB

(1) 16M x 64

(1) 16M x 64

(1) 16M x 64

512MB

(1) 32M x 64

(1) 16M x 64

(1) 16M x 64

512MB

(1) 32M x 64

(1) 32M x 64

None

768MB

(1) 32M x 64

(1) 32M x 64

(1) 32M x 64

Note: Board accepts EDO & SDRAM memory.


CACHE CONFIGURATION

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


CPU SPEED SELECTION

CPU speed

Clock speed

Multiplier

U19/1

U19/2

U19/3

U19/4

233MHz

66MHz

3.5x

On

On

Off

Off

266MHz

66MHz

4x

On

Off

On

On

300MHz

66MHz

4.5x

On

Off

Off

On

333MHz

66MHz

5x

On

Off

On

Off


CPU SPEED SELECTION (CON'T)

CPU speed

Clock speed

Multiplier

U19/5

U19/6

U19/7

233MHz

66MHz

3.5x

Off

Off

Off

266MHz

66MHz

4x

Off

Off

Off

300MHz

66MHz

4.5x

Off

Off

Off

333MHz

66MHz

5x

Off

Off

Off