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VESA X86VLWB

UNIDENTIFIED

VESA X86VLWB

Processor

80386DX/80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Intel

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

80387DX

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo LED

JP32

Power LED & keylock

J19

32-bit VESA Local bus slots

SL1, SL2

Speaker

J20

Reset switch

SW1

Turbo switch

JP31

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS normal operation

JP1

pins 2 & 3 closed

 

CMOS memory clear

JP1

pins 1 & 2 closed

 

Bus speed select - Clock/5

JP3

Closed

 

Bus speed select - Clock/4

JP3

Open

Monitor type select monochrome

JP4

Closed

 

Monitor type select color

JP4

Open

Factory configured - do not alter

JP16

Open

 

Enable 486SX PQFP

JP17

Open

 

Disable 486SX PQFP

JP17

Closed

 

Enable 386DX PQFP

JP18

Open

 

Disable 386DX PQFP

JP18

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

PROCESSOR TYPE CONFIGURATION

Type

JP2

JP6

JP7

Cyrix

Closed

Closed

Closed

Intel/AMD

Open

Open

Open

CPU TYPE CONFIGURATION

Type

JP5

JP12

80386

pins 2 & 3 closed

Closed

80486

pins 1 & 2 closed

Open

CPU CLOCK CONFIGURATION

Type

Speed

JP25

JP33

80386DX

25MHz

pins 2 & 3 closed

pins 1 & 2 closed

80386DX

33MHz

pins 2 & 3 closed

pins 1 & 2 closed

80486SX

25MHz

pins 2 & 3 closed

pins 2 & 3 closed

80486SX

33MHz

pins 2 & 3 closed

pins 2 & 3 closed

80486DX

33MHz

pins 2 & 3 closed

pins 2 & 3 closed

80486DX

50MHz

pins 1 & 2 closed

pins 1 & 2 closed

80486DX2

50iMHz

pins 1 & 2 closed

pins 1 & 2 closed

80486DX2

66iMHz

pins 2 & 3 closed

pins 2 & 3 closed

486 PROCESSOR CONFIGURATION

Type

JP35

JP36

JP37

80486SX

pins 2 & 3 closed

Open

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

Closed

pins 1 & 2 closed

80486DX2

pins 1 & 2 closed

Closed

pins 1 & 2 closed

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U39)

TAG (U40)

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

NONE

128KB

(4) 32K x 8

NONE

(1) 8K x 8

NONE

256KB

(4) 32K x 8

(4) 32K x 8

(1) 8K x 8

(1) 8K x 8

CACHE JUMPER CONFIGURATION

Size

JP10

JP11

JP13

JP15

64KB

pins 2 & 3 closed

Open

Open

Open

128KB

pins 2 & 3 closed

Closed

Closed

Open

256KB

pins 1 & 2 closed

Closed

Closed

Closed

VESA CPU TYPE CONFIGURATION

CPU Type

JP30

JP34

80386

pins 2 & 3 closed

pins 1 & 2 closed

80486

pins 1 & 2 closed

pins 2 & 3 closed

VESA WAIT STATE CONFIGURATION

CPU speed

Wait states

JP22

JP26

< 33MHz

0 wait states

Open

Open

> 33MHz

1 wait states

Closed

Closed

MISCELLANEOUS TECHNICAL NOTES

Note:The VESA bus can be disabled by removing two integrated chips (IC) off the system board.

To disable the VESA bus, ICs located on U29 and U38 must be removed and the following

jumpers must be installed: JP8, JP9, JP14, JP19, JP21, JP23, JP24, JP27.

To enable the VESA bus, insert two ICs at U29 and U38. And all jumpers in above paragraph

must be open.

Some system boards may have a clock generating device which must be set to generate the

proper clock speed for the CPU. Jumpers JP28 and JP29 are used to set the clock frequency

the device should generate. In most systems, this device is replaced with an oscillator.