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486SCSL/486SCSI

CHAINTECH COMPUTER COMPANY, LTD.

486SCSL/486SCSI

Processor

CX486S/CX486S & CX487S/80486SX/80487SX/AMD486DX/80486DX/

ODP486SX/ 80486DX2

Processor Speed

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

Chip Set

SIS

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

265mm x 220mm

I/O Options

32-bit VESA local bus slots (2) (486SCSL only)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Power LED & keylock

J5

Turbo LED

J2

Reset switch

J6

Turbo switch

J3

32-bit VESA local bus slots

SL1 & SL2

Speaker

J4

 

 

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Turbo switch select low

J3

Open

 

Turbo switch select high

J3

Closed

CMOS memory normal operation

JP12

Pins 1 & 2 closed

 

CMOS memory clear

JP12

Pins 2 & 3 closed

PQFP CPU disabled

JP16

Closed

 

PQFP CPU enabled

JP16

Open

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

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 16K x 8 or (1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP1

JP2

JP3

JP4

JP5

JP6

JP7

64KB

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

Open

1 & 2

128KB

2 & 3

1 & 2

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

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP13

JP14

JP15

CX486S

Open

Pins 2 & 3 closed

Open

CX486S & CX487S

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

80486SX (PQFP)

Open

Pins 2 & 3 closed

Open

80486SX (PGA)

Open

Pins 2 & 3 closed

Open

ODP486SX

Pins 2 & 3 closed

Pins 1 & 2 closed

Closed

80487SX

Pins 2 & 3 closed

Pins 1 & 2 closed

Closed

AMD486DX

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

80486DX

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

80486DX2

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

CPU SPEED CONFIGURATION

Speed

JP20

JP21

JP22

25MHz

Closed

Open

Open

33MHz

Open

Open

Closed

40MHz

Open

Closed

Closed

50iMHz

Closed

Open

Open

50MHz

Open

Closed

Open

66iMHz

Open

Open

Closed

VESA WAIT STATE CONFIGURATION (SCSL ONLY)

Wait states

JP9/11

0 wait states

Pins 1 & 2 closed

1 wait state

Pins 2 & 3 closed

BUS SPEED CONFIGURATION (SCSL ONLY)

CPU speed

JP8/10

<= 33MHz

Pins 1 & 2 closed

> 33MHz

Pins 2 & 3 closed