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486/25 MAINBOARD

UNIDENTIFIED

486/25 MAINBOARD

Processor

80486SX

Processor Speed

25MHz

Chip Set

Unidentified

Max. Onboard DRAM

None (8MB or 16MB on riser card)

Cache

None (8KB is on the CPU)

BIOS

Award

Dimensions

330mm x 225mm

I/O Options

None

NPU Options

80387DX

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

CON1

Speaker

CON5

Turbo LED

CON2

Power LED & keylock

CON6

Turbo switch

CON3

Riser Card

S1

Reset switch

CON4

   

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Battery type select external

JP1

pins 2 & 3 closed

 

Battery type select internal

JP1

pins 1 & 2 closed

Monitor type select monochrome

JP2

pins 2 & 3 closed

 

Monitor type select color

JP2

pins 1 & 2 closed

Power good from mainboard

JP3

pins 2 & 3 closed

 

Power good from power supply

JP3

pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 1

Bank 2

1MB

(36) 41256

NONE

2MB

(36) 41256

(1) 41256

4MB

(36) 41000

NONE

8MB

(36) 41000

(36) 41000

MEMORY CARD CONFIGURATION

Select

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

1MB

On

On

On

On

On

On

2MB

Off

On

On

On

On

Off

4MB

Off

Off

On

On

Off

On

8MB

Off

Off

Off

On

Off

Off

Note: SW1 is located on the mainboard.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

NONE

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

Note: This may be SIMM or SIP

MEMORY CARD CONFIGURATION

Select

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

1MB

On

On

On

On

On

On

2MB

Off

On

On

On

On

Off

4MB

Off

Off

On

On

On

Off

4MB

Off

Off

On

On

Off

On

8MB

Off

Off

Off

On

Off

Off

16MB

Off

Off

Off

Off

Off

Off

Note: SW1 is located on the mainboard.