...because we can't all be on the bleeding edge...





MB-1425/33/40/50UCV-A

BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-1425/33/40/50UCV-A

Processor

CX486S/80486SX/80487SX/80486DX/ODP486SX/80486DX2/

Pentium Overdrive

Processor Speed

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

Chip Set

Biostar

Max. Onboard DRAM

64MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP8

Power LED & keylock

JP15E

5V ground

JP15A

Speaker

JP15F

Turbo switch

JP15B

32-bit VESA Local bus slot

V1

Reset switch

JP15C

32-bit VESA Local bus slot

V2

Turbo LED

JP15D

32-bit VESA Local bus slot

V3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

JP8

pins 2 & 3 closed

 

CMOS memory clear

JP8

pins 3 & 4 closed

Power good signal detect from power supply

JP11

pins 1 & 2 closed

 

Power good signal detect from board

JP11

pins 2 & 3 closed

One CPU (PQFP or PGA) on board installed

JP12

pins 1 & 2 closed

 

Two CPUs (enabled PGA and disabled PQFP) on board installed

JP12

pins 2 & 3 closed

Monitor type select color

JP14

pins 2 & 3 closed

 

Monitor type select monochrome

JP14

pins 1 & 2 closed

Add on card select normal operation

JP28

pins 1 & 2 closed

 

Add on card select Weitek 9000 VGA card installed

JP28

pins 2 & 3 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) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

(4) 4M x 9

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

CACHE CONFIGURATION

Size

Max Cachable

Bank 0

Bank 1

TAG

32KB

8MB

(4) 8K x 8

NONE

(1) 8K x 8

64KB

16MB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

32MB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

64MB

(4) 32K x 8

(4) 32K x 8

(1) 16K x 8

256KB

64MB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP5

JP6

JP7

JP9

JP10

32KB

pins 2 & 3

Open

Open

Open

Open

64KB

pins 1 & 2

Open

Open

Closed

Open

128KB

pins 2 & 3

pins 2 & 3

Closed

Closed

Open

256KB

pins 1 & 2

pins 1 & 2

Closed

Closed

pins 2 & 3

256KB

pins 1 & 2

pins 1 & 2

Closed

Closed

pins 1 & 2

Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP16

JP17

CX486S

Open

pins 2 & 3 closed

80486SX

Open

pins 2 & 3 closed

80487SX

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

ODP486SX

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

80486DX2

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

Pentium Overdrive

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

CPU SPEED CONFIGURATION

Speed

JP21

JP22

JP23

JP27

25MHz

Closed

Open

Closed

Open

33MHz

Closed

Closed

Open

Open

40MHz

Open

Open

Closed

Closed

50i MHz

Closed

Open

Closed

Open

50MHz

Open

Closed

Open

Closed

66i MHz

Closed

Closed

Open

Open

VESA BUS SPEED CONFIGURATION

Mode

JP19

JP20

JP25 (V2)

JP26 (V1)

JP29 (V3)

JP30 (V2 & V3)

Synchronous

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

Asynchronous

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

Note:Pins designated should be in the closed position.

When V2 & V3 are used at the same time, JP25 must be left open.