J-MARK COMPUTER CORPORATION

J-446B
Device Type Mainboard
Processor AM486DX2/AM486DX4/AM5X86/AM X5/CX486DX2/CX486DX4/
CX5X86/80486SX/80486DX2/80486DX4/P24D/P24T
Processor Speed 25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/
100(internal)/120(internal)MHz
Chip Set SIS
Maximum Onboard Memory 128MB
Cache 128/256KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2)


 

CONNECTIONS
Purpose

Location

 Purpose

Location
Parallel port

CN1

 IDE interface LED

JP33
IDE interface 2

CN2

 Standby mode connector

JP35
IDE interface 1

CN3

 Green PC connector

JP36
Floppy drive interface

CN4

 Turbo LED

JP37
Serial port 1

CN5

 Reset switch

JP38
Serial port 2

CN6

 Power LED & keylock

JP40
External battery

JP1

 Green PC LED

LED1
Speaker

JP27

 32-bit PCI slots

PC1 – PC3


USER CONFIGURABLE SETTINGS

Function

Label

Position
  Monitor type select color

JP6

Closed
  Monitor type select monochrome

JP6

Open

»

 Factory configured - do not alter

JP7

Unidentified

»

 Factory configured - do not alter

JP8

Unidentified

»

 Factory configured - do not alter

JP13

Unidentified

»

 Factory configured - do not alter

JP18

Unidentified

»

 Factory configured - do not alter

JP21

Unidentified

»

 Factory configured - do not alter

JP22

Unidentified
  Turbo enabled

JP39

Pins 2 & 3 closed
  Turbo disabled

JP39

Pins 1 & 2 closed


SIMM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

None

None

None

2MB

(1) 256K x 36

(1) 256K x 36

None

None

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

None

4MB

(1) 1M x 36

None

None

None

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

None

8MB

(1) 2M x 36

None

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

9MB

(1) 2M x 36

(1) 256K x 36

None

None

10MB

(1) 2M x 36

(1) 256K x 36

(1) 256K x 36

None

12MB

(1) 2M x 36

(1) 1M x 36

None

None

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

12MB

(1) 1M x 36

(1) 2M x 36

None

None

16MB

(1) 4M x 36

None

None

None

16MB

(1) 2M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 2M x 36

(1) 2M x 36

None

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

17MB

(1) 4M x 36

(1) 256K x 36

None

None

18MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

None

19MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

20MB

(1) 4M x 36

(1) 1M x 36

None

None

20MB

(1) 2M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

24MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

None


 

SIMM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

24MB

(1) 4M x 36

(1) 2M x 36

None

None

24MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

None

28MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

32MB

(1) 8M x 36

None

None

None

32MB

(1) 4M x 36

(1) 2M x 36

(1) 2M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

32MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

33MB

(1) 8M x 36

(1) 256K x 36

None

None

34MB

(1) 8M x 36

(1) 256K x 36

(1) 256K x 36

None

35MB

(1) 8M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

36MB

(1) 8M x 36

(1) 1M x 36

None

None

40MB

(1) 8M x 36

(1) 1M x 36

(1) 1M x 36

None

40MB

(1) 8M x 36

(1) 2M x 36

None

None

40MB

(1) 4M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

44MB

(1) 8M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

48MB

(1) 8M x 36

(1) 2M x 36

(1) 2M x 36

None

48MB

(1) 8M x 36

(1) 4M x 36

None

None

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

56MB

(1) 8M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

64MB

(1) 8M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

(1) 8M x 36

(1) 8M x 36

None

None

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

80MB

(1) 8M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

96MB

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

None

104MB

(1) 2M x 36

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

112MB

(1) 4M x 36

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

128MB

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36

(1) 8M x 36


CACHE CONFIGURATION

Size

Bank 0

TAG

128KB

(4) 32K x 8

Unidentified

256KB

(2) 32K x 32

Unidentified


CPU SPEED SELECTION

Speed

JP11

JP12

25MHz

Open

Pins 1 & 2 closed

33MHz

Pins 1 & 2, 3 & 4 closed

Pins 1 & 2 closed

40MHz

Pins 1 & 2 closed

Pins 1 & 2 closed

50iMHz

Open

Pins 1 & 2 closed

50MHz

Pins 3 & 4 closed

Pins 2 & 3 closed

66iMHz

Pins 1 & 2, 3 & 4 closed

Pins 1 & 2 closed

75iMHz

Pins 1 & 2, 3 & 4 closed

Pins 1 & 2 closed

80iMHz

Pins 1 & 2 closed

Pins 1 & 2 closed

100iMHz

Pins 1 & 2, 3 & 4 closed

Pins 1 & 2 closed

120iMHz

Pins 1 & 2 closed

Pins 1 & 2 closed


 

CPU TYPE SELECTION

Type

JP9

JP10

JP14

JP15

JP16

AM 486DX2-66

2 & 3

2 & 3

Open

Open

2 & 3

AM486DX2-80

2 & 3

2 & 3

Open

Open

2 & 3

AM486DX4-100 (WB)

2 & 3

2 & 3

Open

Open

1 & 2

AM486DX4-100 (WT)

2 & 3

1 & 2

Open

1 & 2

1 & 2

AM486DX4-120

2 & 3

1 & 2

Open

1 & 2

1 & 2

AM5X86-P75

2 & 3

1 & 2

Open

1 & 2

1 & 2

AM X5-133

2 & 3

1 & 2

Open

1 & 2

1 & 2

CX486DX2-66

2 & 3

2 & 3

Open

Open

Open

CX486DX2-80

2 & 3

2 & 3

Open

Open

Open

CX486DX4-100

2 & 3

2 & 3

Open

Open

Open

CX 5X86-100

2 & 3

2 & 3

Open

1 & 2

Open

CX 5X86-120

2 & 3

2 & 3

Open

1 & 2

Open

80486DX4-100 (WB)

2 & 3

1 & 2

Open

1 & 2

1 & 2

80486DX4-100 (WT)

2 & 3

2 & 3

Open

Open

Open

80486DX2-66

2 & 3

2 & 3

Open

Open

Open

80486DX2-50

2 & 3

2 & 3

Open

Open

Open

80486SX-25

Open

2 & 3

Open

Open

Open

P24D-66

2 & 3

1 & 2

Open

1 & 2

1 & 2

P24T-63

1 & 2

1 & 2

Open

Open

Open

P24T-83

1 & 2

1 & 2

Open

Open

Open
Note: Pins designated should be in the closed position.


CPU TYPE SELECTION (CON’T)

Type

JP17

JP20

JP23

JP24

JP25

AM 486DX2-66

Open

Open

Open

4 & 5

1 & 2, 3 & 4

AM486DX2-80

Open

Open

Open

4 & 5

1 & 2, 3 & 4

AM486DX4-100 (WB)

Open

Open

Open

4 & 5

1 & 2, 3 & 4

AM486DX4-100 (WT)

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

AM486DX4-120

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

AM5X86-P75

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

AM X5-133

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

CX486DX2-66

1 & 2

Closed

Open

2 & 3

1 & 2, 3 & 4

CX486DX2-80

1 & 2

Closed

Open

2 & 3

1 & 2, 3 & 4

CX486DX4-100

1 & 2

Closed

Open

2 & 3

1 & 2, 3 & 4

CX 5X86-100

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

CX 5X86-120

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

80486DX4-100 (WB)

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

80486DX4-100 (WT)

2 & 3

Closed

1 & 2

4 & 5

1 & 2, 3 & 4

80486DX2-66

2 & 3

Closed

1 & 2

4 & 5

1 & 2, 3 & 4

80486DX2-50

2 & 3

Closed

1 & 2

4 & 5

1 & 2, 3 & 4

80486SX-25

2 & 3

Closed

1 & 2

4 & 5

2 & 3

P24D-66

2 & 3

Closed

2 & 3

4 & 5

1 & 2, 3 & 4

P24T-63

2 & 3

Closed

Open

1 & 2

1 & 2, 3 & 4

P24T-83

2 & 3

Closed

Open

1 & 2

1 & 2, 3 & 4
Note: Pins designated should be in the closed position.


 

CPU TYPE SELECTION (CON’T)

Type

JP26

JP28

JP29

JP30

AM 486DX2-66

3 & 4

Open

Open

Open

AM486DX2-80

3 & 4

Open

Open

Open

AM486DX4-100 (WB)

3 & 4

Open

Open

Open

AM486DX4-100 (WT)

1 & 2, 3 & 4

Open

1 & 2

Open

AM486DX4-120

1 & 2, 3 & 4

Open

1 & 2

Open

AM5X86-P75

1 & 2, 3 & 4

Open

1 & 2

2 & 3

AM X5-133

1 & 2, 3 & 4

Open

1 & 2

2 & 3

CX486DX2-66

2 & 3

2 & 3

2 & 3

Open

CX486DX2-80

2 & 3

2 & 3

2 & 3

Open

CX486DX4-100

2 & 3

2 & 3

2 & 3

Open

CX 5X86-100

1 & 2, 3 & 4

Open

1 & 2

Open

CX 5X86-120

1 & 2, 3 & 4

Open

1 & 2

Open

80486DX4-100 (WB)

1 & 2, 3 & 4

Open

1 & 2

Open

80486DX4-100 (WT)

3 & 4

Open

Open

Open

80486DX2-66

3 & 4

Open

Open

Open

80486DX2-50

3 & 4

Open

Open

Open

80486SX-25

3 & 4

Open

Open

Open

P24D-66

1 & 2, 3 & 4

Open

1 & 2

Open

P24T-63

3 & 4

1 & 2

1 & 2

Open

P24T-83

3 & 4

1 & 2

1 & 2

Open
Note: Pins designated should be in the closed position.


CPU VOLTAGE SELECTION

Voltage

JP31

JP32

JP34

3.3v

Pins 2 & 3 closed

Pins 5 & 6 closed

Pins 2 & 3 closed

3.45v

Pins 2 & 3 closed

Pins 3 & 4 closed

Pins 2 & 3 closed

4.0v

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

5v

Pins 1 & 2 closed

Open

Pins 1 & 2 closed


CMOS SELECTION

Setting

JP2

JP3

»Normal operation

Pins 1 & 2 closed

Pins 1 & 2 closed

Memory clear

Pins 2 & 3 closed

Pins 2 & 3 closed


BIOS SELECTION

Setting

JP19

»EPROM

Open

12v

Pins 1 & 2 closed

5v

Pins 2 & 3 closed