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JS-168A

UNIDENTIFIED

JS-168A

Processor

80286 (exact location unidentified)

Processor Speed

12MHz

Chip Set

Unidentified

Max. Onboard DRAM

4MB

Cache

None

BIOS

AMI/Award/ERSO/Phoenix

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287 (exact location unidentified)

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J20

Turbo LED

JP8

Reset switch

JP6

Speaker

JP10

Turbo switch

JP7

   

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

 

Wait state select 0 wait states

JP5

Closed

 

Wait state select 1 wait state

JP5

Open

 

Turbo select keyboard control

JP9

pins 1 & 2 closed

 

Turbo select controlled by SW1/1

JP9

pins 2 & 3 closed

 

CPU speed select low

SW1/1

On

 

CPU speed select high

SW1/1

Off

 

Monitor type select color

SW1/2

On

 

Monitor type select monochrome

SW1/2

Off

 

Parity enabled

SW1/3

On

 

Parity disabled

SW1/3

Off

 

EMS port address select 0E8H

SW1/4

On

 

EMS port address select 098H

SW1/4

Off

 

BIOS type select 27128

SW1/5

On

 

BIOS type select 27256

SW1/5

Off

DRAM CONFIGURATION

Size

Bank A

Bank B

Bank B/0

512KB (A)

(18) 41256

NONE

NONE

512KB (B)

NONE

NONE

(4) 44256 & (2) 41256

512KB (C)

NONE

NONE

NONE

640KB(A)

(18) 4164

NONE

(4) 44256 & (2) 41256

640KB(B)

(18) 4164

NONE

NONE

640KB (C)

NONE

NONE

(4) 44256 & (2) 41256 & (4) 4464 & (2) 4164

1MB (A)

NONE

NONE

(8) 44256 & (4) 41256

1MB (B)

NONE

NONE

NONE

1MB (C)

(18) 41256

NONE

(4) 44256 & (2) 41256

1MB (D)

(18) 41256

NONE

NONE

1MB (E)

(18) 41256

NONE

NONE

1MB (F)

(18) 41256

NONE

NONE

2MB (A)

(18) IBM DRAM

NONE

NONE

2MB (B)

NONE

NONE

NONE

4MB (A)

NONE

NONE

NONE

4MB (B)

(18) 41256

NONE

NONE

4MB (C)

(18) 41256

NONE

NONE

Note: The orientation of the DRAM banks is unidentified.

DRAM CONFIGURATION (CONíT)

Size

Bank B/1

Bank C

Bank C/SIM 0

Bank C/SIM 1

512KB (A)

NONE

NONE

NONE

NONE

512KB (B)

NONE

NONE

NONE

NONE

512KB (C)

NONE

NONE

(2) 256K x 9

NONE

640KB(A)

NONE

NONE

NONE

NONE

640KB(B)

NONE

NONE

(2) 256K x 9

NONE

640KB (C)

NONE

NONE

NONE

NONE

1MB (A)

NONE

NONE

NONE

NONE

1MB (B)

NONE

NONE

(2) 256K x 9

(2) 256K x 9

1MB (C)

NONE

NONE

NONE

NONE

1MB (D)

(4) 44256 & (2) 41256

NONE

NONE

NONE

1MB (E)

NONE

NONE

(2) 256K x 9

NONE

1MB (F)

NONE

NONE

NONE

(2) 256K x 9

2MB (A)

NONE

NONE

NONE

NONE

2MB (B)

NONE

NONE

(2) 1M x 9

NONE

4MB (A)

NONE

NONE

(2) 1M x 9

(2) 1M x 9

4MB (B)

NONE

NONE

(2) 1M x 9

NONE

4MB (C)

NONE

NONE

NONE

(2) 1M x 9

Note: The orientation of the DRAM banks is unidentified.

DRAM JUMPER CONFIGURATION

Size

JP21

JP22

JP23

512KB (A)

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

512KB (B)

N/A

N/A

N/A

512KB (C)

N/A

N/A

N/A

640KB (A)

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

640KB (B)

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

640KB (C)

N/A

N/A

N/A

1MB (A)

N/A

N/A

N/A

1MB (B)

N/A

N/A

N/A

1MB (C)

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

1MB (D)

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

1MB (E)

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

1MB (F)

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

2MB (A)

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

2MB (B)

N/A

N/A

N/A

4MB (A)

N/A

N/A

N/A

4MB (B)

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

4MB (C)

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

DRAM SWITCH CONFIGURATION

Size

SW1/6

SW1/7

SW1/8

512KB

On

On

On

640KB

On

On

Off

640KB + 384KB

On

Off

On

640KB + 384KB (EMS)

On

Off

Off

640KB + 1408KB

Off

On

On

640KB + 1408KB (EMS)

Off

On

Off

640KB + 3456KB

Off

Off

On

640KB + 3456KB (EMS)

Off

Off

Off

KEYBOARD BIOS PIN CONFIGURATION

Pin

JP1

JP2

JP3

JP4

23

Open

Open

Closed

Open

27

Open

Closed

Open

Open

30

Open

Open

Open

Closed

32

Closed

Open

Open

Open

MISCELLANEOUS TECHNICAL NOTE

Note: The location of pin 1 is unidentified.