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286 MAIN BOARD (DIP VERSION)

UNIDENTIFIED

286 MAIN BOARD (DIP VERSION)

Processor

80286

Processor Speed

12MHz

Chip Set

Unknown

Max. Onboard DRAM

4MB

Cache

None

BIOS

Award

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J1

Turbo switch

J4

Speaker

J2

Turbo LED

J5

Reset switch

J3

 

 

USER CONFIGURABLE SETTINGS

 

Function

Jumper

Position

 

BIOS type select 27128

JP1

pins 1 & 2 closed

 

BIOS type select 27256

JP1

pins 2 & 3 closed

Monitor type select color

JP2

Closed

 

Monitor type select monochrome

JP2

Open

Factory configured - DRAM access speed 12MHz

JP5

pins 2 & 3 closed

 

Invalid setting

JP5

pins 1 & 2 closed

NPU speed select ³ 8MHz

JP13

pins 1 & 2 closed

 

NPU speed select £ 6MHz

JP13

pins 2 & 3 closed

Bus speed select fast

JP15

Closed

 

Bus speed select slow

JP15

Open

Early address latch enabled

JP16

Open

 

Early address latch disabled

JP16

Closed

DRAM select 0 wait states

JP17

Closed

 

DRAM select 1 wait state

JP17

Open

Parity check enabled

JP44

Open

 

Parity check disabled

JP44

Closed

 

Notes: Location of pin 1s unverified. Location of JP44 unverified

   

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

Bank 4

P0

P1

JP4

512KB

(16) 41256

NONE

NONE

NONE

NONE

(2) 41256

NONE

closed

512KB

NONE

(4) 44256

NONE

NONE

NONE

(2) 41256

NONE

closed

640KB

(16) 41256

(4) 4464

NONE

NONE

NONE

(2) 41256

(2) 4164

closed

640KB

NONE

(4) 44256

NONE

(4) 4464

NONE

(2) 41256

(2) 4164

closed

640KB

(16) 41256

NONE

(16) 4164

NONE

NONE

(2) 41256

(2) 4164

closed

640KB

NONE

(4) 44256

(16) 4164

NONE

NONE

(2) 41256

(2) 4164

closed

1MB

(16) 41256

NONE

(16) 41256

NONE

NONE

(2) 41256

(2) 41256

closed

1MB

NONE

(4) 44256

NONE

NONE

(4) 44256

(2) 41256

(2) 41256

closed

1MB

(16) 41256

NONE

NONE

NONE

(4) 44256

(2) 41256

(2) 41256

closed

1MB

NONE

(4) 44256

(16) 41256

NONE

NONE

(2) 41256

(2) 41256

closed

2MB

(16) 411000

NONE

NONE

NONE

NONE

(2) 411000

NONE

open

2.128MB

(16) 411000

NONE

(16) 4164

NONE

NONE

(2) 411000

(2) 4164

open

2.5MB

(16) 411000

NONE

(16) 41256

NONE

NONE

(2) 411000

(2) 41256

open

4MB

(16) 411000

NONE

(16) 411000

NONE

NONE

(2) 411000

(2) 411000

open