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JS-128A

UNIDENTIFIED

JS-128A

Processor

80286

Processor Speed

12MHz

Chip Set

SUNTAC

Max. Onboard DRAM

4MB

SRAM Cache

None

BIOS

AMI/Award/ERSO/Phoenix

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287

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

CPU speed select fast

DSP1/1

Off

 

CPU speed select slow

DSP1/1

On

Monitor type select color

DSP1/2

On

 

Monitor type select monochrome

DSP1/2

Off

Factory configured - do not alter

DSP1/3

N/A

CPU speed select fast

DSP1/4

On

 

EMS port address select 098H

DSP1/4

Off

CPU speed select fast

DSP1/5

On

 

BIOS type select 27256

DSP1/5

Off

DRAM select 0 wait states

JP5

closed

 

DRAM select 1 wait state

JP5

open

CPU speed select fast

JP9

pins 1 & 2 closed

 

CPU speed select switchable at turbo switch

JP9

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(18) 41256

NONE

640KB

(18) 41256

(18) 4164

1MB

(18) 41256

(18) 41256

1MB w/EMS

(18) 41256

(18) 41256

2MB

(18) 411000

NONE

2MB w/EMS

(18) 411000

NONE

4MB

(18) 411000

(18) 411000

4MB w/EMS

(18) 411000

(18) 411000

DRAM SWITCH CONFIGURATION

Size

DSP1/6

DSP1/7

DSP1/8

512KB

On

On

On

640KB

On

On

Off

1MB

On

Off

On

1MB w/EMS

On

Off

Off

2MB

Off

On

On

2MB w/EMS

Off

On

Off

4MB

Off

Off

On

4MB w/EMS

Off

Off

Off

KEYBOARD CONFIGURATION

Size

JP1

JP2

JP3

JP4

Pin 32

Closed

Open

Open

Open

Pin 27

Open

Closed

Open

Open

Pin 23

Open

Open

Closed

Open

Pin 30

Open

Open

Open

Closed