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J-286P SYSTEM BOARD Motherboard Settings and Configuration






UNIDENTIFIED

J-286P SYSTEM BOARD

Processor

80286 (exact location unknown)

Processor Speed

12/16/20/24MHz

Chip Set

Suntac

Max. Onboard DRAM

5MB

Cache

None

BIOS

AMI

Dimensions

220mm x 220mm

I/O Options

Floppy drive interface (on some models), IDE interface (on some models)

NPU Options

80287 (exact location unknown)

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J1

Speaker

J4

Turbo switch

J2

Power LED & keylock

J5

Turbo LED

J3

External battery

JP9

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

JP1

Open

Factory configured - do not alter

JP2

Open

Floppy drive interface enabled (interface location unknown)

JP5

Closed

 

Floppy drive interface disabled

JP5

Open

Monitor type select monochrome

JP12

Open

 

Monitor type select color

JP12

Closed

Parity check enabled

JP13

Closed

 

Parity check disabled

JP13

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Parity 2

Bank 3

Parity 3

1MB

NONE

NONE

(4) 44256

(4) 41256

(4) 44256

(4) 41256

1MB

(2) 256K x 9

(2) 256K x 9

NONE

NONE

NONE

NONE

2MB

(2) 256K x 9

(2) 256K x 9

(4) 44256

(4) 41256

(4) 44256

(4) 41256

2MB

(2) 1M x 9

NONE

NONE

NONE

NONE

NONE

3MB

(2) 1M x 9

NONE

(4) 44256

(4) 41256

(4) 44256

(4) 41256

4MB

(2) 1M x 9

(2) 1M x 9

NONE

NONE

NONE

NONE

5MB

(2) 1M x 9

(2) 1M x 9

(4) 44256

(4) 41256

(4) 44256

(4) 41256

DRAM JUMPER CONFIGURATION

Size

JP8

JP9

JP10

JP11

1MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

1MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

2MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

2MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

3MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

4MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

5MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

IDE INTERFACE CONFIGURATION

Setting

JP3

JP4

Enabled

Closed

Open

Disabled

Open

Closed

Note: The location of the interface is unknown. Interface is an option and may not be present.

CPU SPEED CONFIGURATION

System speed

Bus speed

JP20

12MHz

6MHz

pins 1 & 2 closed

16MHz

8MHz

pins 1 & 2 closed

20MHz

8MHz

pins 2 & 3 closed

24MHz

8MHz

pins 2 & 3 closed








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