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SY-23D

SOYO COMPUTER CO., LTD.

SY-23D

   

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

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

Chip Set

ETEQ

Max. Onboard DRAM

32MB

Cache

None

BIOS

AMI

Dimensions

241mm x 220mm

I/O Options

None

NPU Options

None

   

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J17

External battery

J20

Speaker

J18

Turbo switch

J21

Reset switch

J19

Turbo LED

J22

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

PGA or PQFP CPU enabled

J23

Open

 

PGA CPU enabled, PQFP CPU disabled

J23

Closed

Note:If using the "PGA or PQFP" setting (J23 open) please note that only one CPU can be installed.

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

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

CPU TYPE CONFIGURATION

Type

JP101

JP102

JP103

JP104

80486SX

Open

pins 2 & 3 closed

open

pins 2 & 3 closed

80487SX

Closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX

Closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

ODP486SX

Closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

80486DX2

Closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

CPU SPEED CONFIGURATION

Speed

OSC U24

J24

J25

J26

20MHz

40MHz

Open

Closed

Closed

25MHz

50MHz

Closed

Open

Closed

33MHz

66.67MHz

Closed

Closed

Open

50iMHz

50MHz

Closed

Open

Closed

66iMHz

66.67MHz

Closed

Closed

Open

Note:The location of socket U24 is unknown.