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4MAHL, 4DMU-50AHL

EFA CORPORATION

4MAHL, 4DMU-50AHL

Processor

CX486SX/CX487SX/80486SX/80486DX/ODP486SX/80486DX2

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

UMC

Max. Onboard DRAM

64MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface,

game port, IDE interface (2), parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 2

CN2

Power LED & keylock

J8

Serial port 1

CN3

Reset switch

J9

Floppy drive interface

CN11

Game port

JP1

IDE interface

CN12

Turbo switch

JP31

AT bus hard drive interface

CN13

Turbo LED

JP32

Parallel port

CN14

Speaker

JP33

External battery

J1

32-bit VESA Local bus slot

S1

Hard drive LED (AT12)

J6

32-bit VESA Local bus slot

S2

AT bus hard drive LED

J7

   

Note:The exact location of J7 is unknown.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

HDD I/O CHRDY# disabled

J5

Open

 

HDD I/O CHRDY# enabled

J5

Closed

Game port enabled

JP1

pins 1 & 2 closed

 

Game port disabled

JP1

pins 2 & 3 closed

IDE interface disabled

JP3

pins 2 & 3 closed

 

IDE interface enabled

JP3

pins 1 & 2 closed

Floppy drive interface enabled

JP4

pins 1 & 2 closed

 

Floppy drive interface disabled

JP4

pins 2 & 3 closed

AT bus IDE interface or HDC enabled

JP6

pins 2 & 3 closed

 

AT bus IDE interface or HDC disabled

JP6

pins 1 & 2 closed

Factory configured - do not alter

JP8

Closed

Factory configured - do not alter

JP9

Open

Factory configured - do not alter

JP10

N/A

AD12 local bus IDE HDD enabled

JP14

pins 2 & 3 closed

 

AD12 local bus IDE HDD disabled

JP14

pins 1 & 2 closed

Factory configured - do not alter

JP15

pins 2 & 3 closed

Factory configured - do not alter

JP17

pins 2 & 3 closed

Factory configured - do not alter

JP18

pins 2 & 3 closed

 

80486SX enabled

JP28

pins 1 & 2 closed

 

Other CPU enabled

JP28

pins 2 & 3 closed

Factory configured - do not alter

JP29

pins 1 & 2 closed

Factory configured - do not alter

JP30

pins 1 & 2 closed

Factory configured - do not alter

JP35

pins 1 & 2 closed

Factory configured - do not alter

JP39

Open

Factory configured - do not alter

JP40

Open

Factory configured - do not alter

JP41

Open

Factory configured - do not alter

JP42

Open

Factory configured - do not alter

JP50

N/A

Note: JP28 is only configurable when you have a 80486SX PQFP mounted on the mainboard.

The exact location of JP41 is unknown.

SERIAL PORT CONFIGURATION

Port 1 (CN3)

JP7

JP5

COM1

Pins 1 & 2 closed

pins 1 & 2 closed

 

COM3

Pins 2 & 3 closed

pins 1 & 2 closed

 

Disabled

N/A

pins 2 & 3 closed

SERIAL PORT CONFIGURATION

Port 2 (CN2)

JP11

JP13

COM2

Pins 1 & 2 closed

pins 1 & 2 closed

 

COM4

Pins 2 & 3 closed

pins 1 & 2 closed

 

Disabled

N/A

pins 2 & 3 closed

PARALLEL PORT CONFIGURATION

Port

JP2

JP12

LPT2

pins 1 & 2 closed

pins 1 & 2 closed

 

LPT3

pins 2 & 3 closed

pins 1 & 2 closed

 

Disabled

N/A

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

1MB

NONE

(4) 256K x 9

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

4MB

NONE

(4) 1M x 9

5MB

(4) 1M x 9

(4) 256K x 9

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

16MB

NONE

(4) 4M x 9

17MB

(4) 4M x 9

(4) 256K x 9

17MB

(4) 256K x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

64MB

NONE

(4) 16M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP21

JP22

JP23

JP26

JP27

32KB

Open

Open

Open

Open

pins 2 & 3

64KB

Open

Open

Closed

Open

pins 1 & 2

128KB

Open

Closed

Closed

pins 1 & 2

pins 2 & 3

256KB

Closed

Closed

Closed

pins 2 & 3

pins 1 & 2

Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

CX486SX

On

Off

On

Off

On

Off

Off

CX487SX

On

Off

On

Off

On

Off

Off

CX486S

Off

Off

Off

On

Off

Off

Off

80486SX

Off

Off

Off

On

Off

Off

Off

80486DX(PQFP)

On

Off

On

Off

On

On

On

80486DX

On

Off

On

Off

On

Off

Off

ODP486SX

On

On

Off

Off

On

Off

Off

80486DX2

On

Off

On

Off

On

Off

Off

CPU TYPE CONFIGURATION (CONT.)

Speed

JP47

JP49

CX486SX

N/A

pins 1 & 2 closed

CX487SX

N/A

N/A

CX486SX + CX487SX

Closed

pins 2 & 3 closed

CX486S

Open

pins 1 & 2 closed

80486SX

Open

pins 1 & 2 closed

80486DX(PQFP)

Open

pins 1 & 2 closed

80486DX

Open

pins 1 & 2 closed

ODP486SX

Open

pins 1 & 2 closed

80486DX2

Open

pins 1 & 2 closed

Note:The exact location of JP49 is unknown.

CPU SPEED CONFIGURATION

Speed

SW2/1

SW2/2

SW2/3

JP48

20MHz

Off

Off

Off

pins 2 & 3 closed

25MHz

On

Off

Off

pins 2 & 3 closed

33MHz

On

On

On

pins 2 & 3 closed

40MHz

On

On

Off

pins 1 & 2 closed

50i MHz

On

Off

Off

pins 1 & 2 closed

50MHz

Off

Off

On

pins 1 & 2 closed

66i MHz

On

On

On

pins 1 & 2 closed

VESA WAIT STATE/BUS SPEED CONFIGURATION

Speed

Wait states

JP36

JP37

JP38

<=33MHz

0 wait states

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

> 33MHz

1 wait state

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed