BIOSTAR MICROTECH INTERNATIONAL CORPORATION

MB-1420/1425/1433V

Processor

80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

VLSI

Max. Onboard DRAM

32MB

Cache

None

BIOS

Award

Dimensions

230mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J1

Turbo switch

J5

Power LED & keylock

J2

5v DC ground

J6

Turbo LED

J3

External battery

CN2

Reset switch

J4

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Keyboard type select BTC keyboard

JP1

Closed

 

Normal operation

JP1

Open

»

AT bus clock mode select asynchronous

JP2

pins 1 & 2 closed

 

AT bus clock mode select synchronous

JP2

pins 2 & 3 closed

»

Monitor type select monochrome

JP3

Open

 

Monitor type select color

JP3

Closed

»

8042 turbo control pin select pin 30 closed

JP4

pins 1 & 2 closed

 

8042 turbo control pin select pin 23 closed

JP4

pins 2 & 3 closed

»

CMOS memory normal operation

JP5

pins 1 & 2 closed

 

CMOS memory clear

JP5

pins 3 & 4 closed

»

On board keyboard fuse enabled

JP9

Open

 

On board keyboard fuse disabled

JP9

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

17MB

(4) 256K x 9

(4) 4M x 9

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CPU TYPE CONFIGURATION (PQFP CPU INSTALLED)

Type

JP7

JP8

JP14

JP15

80486SX (PQFP) & upgrade to DX/DX2

1 & 2

2 & 3

1 & 2

1 & 2

80486SX (PQFP) & upgrade to Overdrive

open

1 & 2

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (PGA ONLY CPU INSTALLED)

Type

JP7

JP8

JP14

JP15

80487SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

Open

80486DX/DX2

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

Open

Note: The PQFP CPU is optional and may not be present. If there is no PQFP, use the above settings.