SOYO COMPUTER CO., LTD.

SY-020H

 

 

Processor

80486SX/80487SX/80486DX

Processor Speed

16/20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

SIS

Max. Onboard DRAM

32MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

245mm x 220mm

I/O Options

None

NPU Options

4167

 

 

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J17

External battery

J20

Speaker

J18

Turbo switch

J21

Reset switch

J19

Turbo LED

J22

Note:The oscillator at OSC1 must match the external speed of the CPU installed.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP3

Open

 

Monitor type select color

JP3

Closed

»

CMOS memory normal operation

JP5

pins 1 & 2 closed

 

CMOS memory clear

JP5

pins 2 & 3 closed

»

Power good signal detect from board

JP7

pins 1 & 2 closed

 

Power good signal detect from power supply

JP7

pins 2 & 3 closed

»

Keyboard BIOS clock source select programmable timer

JP18

pins 1 & 2 closed

 

Keyboard BIOS clock source select 7MHz

JP18

pins 2 & 3 closed

»

CPU speed select ³ to 25MHz

JP19

pins 1 & 2 closed

 

CPU speed select < 25MHz

JP19

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

32KB

(4) 8K x 8

NONE

(2) 4K x 4

64KB

(4) 8K x 8

(4) 8K x 8

(2) 4K x 4

128KB

(4) 32K x 8

NONE

(2) 16K x 4

256KB

(4) 32K x 8

(4) 32K x 8

(2) 16K x 4

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP10

JP11

JP12

JP13

JP14

JP15

JP16

32KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

64KB

2 & 3

1 & 2

1 & 2

2 & 3

1 & 2

1 & 2

2 & 3

2 & 3

1 & 2

128KB

2 & 3

2 & 3

1 & 2

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU CONFIGURATION

Type

JP24

JP25

JP26

80486SX

pins 2 & 3 closed

Open

Open

80487SX

pins 1 & 2 closed

Closed

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

Closed

pins 1 & 2 closed