CHEERFUL INTERNATIONAL CORPORATION

S680

   

Processor

80386SX

Processor Speed

16MHz

Chip Set

Intel

Max. Onboard DRAM

2MB

Cache

None

BIOS

AMI

Dimensions

330.2mm x 218.4mm

I/O Options

None

NPU Options

80387SX

   

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

CN1

Speaker

CN4

Turbo switch

CN2

Power LED & keylock

CN7

Turbo LED

CN3

External battery

CN8

Note:CN2 can be connected to a turbo switch, however the manufacturer recommends that the computer be turned off before changing the CPU speed.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CPU speed select fast

CN2

closed

 

CPU speed select slow

CN2

open

»

Battery select internal

CN9

pins 2 & 3 closed

 

Battery select external

CN9

pins 1 & 2 closed

»

Monitor type select monochrome

JP2

open

 

Monitor type select color

JP2

closed

»

BIOS type select 2764

JP4

pins 1 & 2 closed

 

BIOS type select 27128

JP4

pins 2 & 3 closed

»

Factory configured - do not alter

JP10

unknown

»

Factory configured - do not alter

JP11

unknown

»

Factory configured - do not alter

JP12

unknown

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

E1 - E8

512KB

(18) 41256

NONE

NONE

NONE

pins 1 & 2 closed

512KB

NONE

NONE

(2) 256K x 9

NONE

pins 2 & 3 closed

1MB

(18) 41256

(18) 41256

NONE

NONE

pins 1 & 2 closed

1MB

NONE

NONE

(2) 256K x 9

(2) 256K x 9

pins 2 & 3 closed

1.5MB

(18) 41256

(18) 41256

(2) 256K x 9

NONE

pins 1 & 2 closed

2MB

(18) 41256

(18) 41256

(2) 256K x 9

(2) 256K x 9

pins 1 & 2 closed

2MB

(18) 411000

NONE

NONE

NONE

pins 1 & 2 closed

2MB

NONE

NONE

(2) 1M x 9

NONE

pins 2 & 3 closed

4MB

(18) 411000

(18) 411000

NONE

NONE

pins 1 & 2 closed

4MB

NONE

NONE

(2) 1M x 9

(2) 1M x 9

pins 2 & 3 closed

6MB

(18) 411000

(18) 411000

(2) 1M x 9

NONE

pins 1 & 2 closed

8MB

(18) 411000

(18) 411000

(2) 1M x 9

(2) 1M x 9

pins 1 & 2 closed

DRAM MODE CONFIGURATION

Mode

DRAM type

JP8

JP9

Page Mode (Four page)

100ns

pins 1 & 2 closed

pins 1 & 2 closed

Page Mode (One page)

100ns

pins 2 & 3 closed

pins 1 & 2 closed

Fast mode

100ns

pins 1 & 2 closed

pins 2 & 3 closed

Slow mode

120ns

pins 2 & 3 closed

pins 2 & 3 closed