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MB-1420/1425/1433V

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.