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486 SYSTEM

ACER, INC.

486 SYSTEM

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Intel

Max. Onboard DRAM

36MB

Cache

64/128/256KB

BIOS

Phoenix

Dimensions

330mm x 218mm

I/O Options

32-bit riser card, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

VESA control PAL chips

C1

Floppy drive interface

CN8

VGA port

CN1

IDE interface

CN9

Parallel port

CN2

VGA feature connector

CN10

Serial port 1

CN3

Multifunction connector

CN11

Serial port 2

CN4

Reset switch

CN12

PS/2 mouse port

CN5

IDE interface LED

CN13

Power controller box connector

CN6

EPA power saving relay

CN14

Power saving controller connector

CN7

Riser Card

SL1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J2

pins 1 & 2 closed

 

CMOS memory clear

J2

pins 2 & 3 closed

On board battery enabled

J13

Closed

 

On board battery disabled

J13

Open

DRAM parity disabled

J14

Closed

 

DRAM parity enabled

J14

Open

On board VGA enabled

J20

pins 1 & 2 closed

 

On board VGA disabled

J20

pins 2 & 3 closed

Keylock disabled

J27

pins 1 & 2 closed

 

Keylock enabled

J27

pins 2 & 3 closed

On board memory enabled

J28

pins 1 & 2 closed

 

On board memory disabled

J28

pins 2 & 3 closed

Floppy/hard drive controller enabled

J29

Closed

 

Floppy/hard drive controller disabled

J29

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

4MB

(4) 44256

NONE

NONE

8MB

(4) 44256

(1) 1M x 36

NONE

12MB

(4) 44256

(1) 1M x 36

(1) 1M x 36

12MB

(4) 44256

(1) 2M x 36

NONE

16MB

(4) 44256

(1) 1M x 36

(1) 2M x 36

20MB

(4) 44256

(1) 4M x 36

NONE

20MB

(4) 44256

(1) 2M x 36

(1) 2M x 36

24MB

(4) 44256

(1) 1M x 36

(1) 4M x 36

36MB

(4) 44256

(1) 4M x 36

(1) 4M x 36

Note: Bank 0 and parity chips are factory installed and are non configurable.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (7 bit)

TAG (8 bit)

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

(1) 16K x 4

128KB

(4) 32K x 8

NONE

(1) 8K x 8

(1) 16K x 4

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

(1) 16K x 4

CACHE JUMPER CONFIGURATION

Size

J5

J6

J23

J24

64KB

pins 2 & 3 closed

pins 2 & 3 closed

N/A

pins 1 & 2 closed

128KB

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

CACHE JUMPER CONFIGURATION (TAG)

Type

J5

J6

J24

Write through

N/A

pins 2 & 3 closed

N/A

Write back/7 bit

pins 2 & 3 closed

pins 1 & 2 closed

Open

Write back/8 bit

pins 1 & 2 closed

pins 2 & 3 closed

Closed

CPU TYPE CONFIGURATION

Type

J9

J10

J11

80486SX (PQFP)

Open

Closed

Open

80486SX (PGA)

Open

Open

Open

80487SX

Open

Closed

Closed

80486DX/DX2

Closed

Closed

Open

CPU SPEED CONFIGURATION

Speed

J17

25MHz

pins 3 - 7 closed

33MHz

pins 4 - 8 closed

50iMHz

pins 2 - 5 closed

66iMHz

pins 3 - 6 closed

VIDEO MEMORY CONFIGURATION

Size

Bank 0

Bank 1

512KB

(4) 256K x 4

NONE

1MB

(4) 256K x 4

(4) 256K x 4

Note: Bank 0 is factory installed and is non configurable.