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486 SYSTEM (V20)

ACER, INC.

486 SYSTEM (V20)

Processor

AM486SX/(SL)AM486SX/80486SX/AM486DX/(SL)AM486DX/80486DX/CX486DX2/AM486DX2(SL)AM486DX2/80486DX2/AM486DX4/ (SL)AM486DX4/80486DX4/P24D/P24T

Processor Speed

25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

64MB

Maximum Video Memory

None

Cache

128/256/512KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slot, 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

Reset switch/green PC connector

CN9 pins 7 & 8

Serial port 2

CN2

Power LED & keylock

CN10 pins 1 - 5

Parallel port

CN3

Speaker

CN10 pins 7 - 10

Floppy drive interface

CN4

Turbo LED

CN10 pins 12 & 13

IDE interface 1

CN5

Turbo switch

CN10 pins 15 - 17

IDE interface 2

CN6

Reset switch

CN10 pins 19 & 20

PS/2 mouse port

CN7

32-bit PCI slots

PC1 - PC3

IDE interface LED

CN8

32-bit VESA local bus slots

SL1

Power LED & keylock

CN9 pins 1 - 4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Password disabled

JP1

Pins 2 & 3 closed

 

Password enabled

JP1

Pins 1 & 2 closed

»

OEM BIOS enabled

JP2

Pins 2 & 3 closed

»

Factory configured - do not alter

JP2

Pins 1 & 2 closed

»

M5115 I/O enabled

JP8

Pins 1 & 2 closed

 

M5115 I/O disabled

JP8

Pins 2 & 3 closed

 

Jumper information unidentified

JP10

Unidentified

»

Local bus IDE I/O address select 0FXH

JP11

Pins 1 & 2 closed

 

Local bus IDE I/O address select 07XH

JP11

Pins 2 & 3 closed

»

M5213N local bus IDE enabled

JP12

Pins 2 & 3 closed

 

M5213N local bus IDE disabled

JP12

Pins 1 & 2 closed

»

Reset key enabled

JP23

Pins 1 & 2 closed

 

Reset key disabled

JP23

Pins 2 & 3 closed

»

Green PC connector enabled

JP24

Pins 2 & 3 closed

 

Reset switch enabled

JP24

Pins 1 & 2 closed

»

Factory configured - do not alter

JP41

Pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

None

None

None

(1) 1M x 36

8MB

(1) 2M x 36

None

None

None

8MB

None

None

(1) 1M x 36

(1) 1M x 36

8MB

None

None

(1) 2M x 36

None

12MB

(1) 2M x 36

None

(1) 1M x 36

None

12MB

(1) 2M x 36

None

None

(1) 1M x 36

12MB

None

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

12MB

(1) 1M x 36

None

(1) 2M x 36

None

12MB

None

(1) 1M x 36

(1) 2M x 36

None

16MB

(1) 2M x 36

None

(1) 2M x 36

None

16MB

(1) 2M x 36

None

(1) 1M x 36

(1) 1M x 36

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

None

None

None

(1) 4M x 36

16MB

(1) 1M x 36

(1) 1M x 36

(1) 2M x 36

None

24MB

(1) 2M x 36

None

(1) 4M x 36

None

24MB

(1) 2M x 36

None

None

(1) 4M x 36

24MB

(1) 4M x 36

None

(1) 2M x 36

None

24MB

None

(1) 4M x 36

(1) 2M x 36

None

28MB

(1) 2M x 36

None

(1) 4M x 36

(1) 1M x 36

28MB

(1) 2M x 36

None

(1) 1M x 36

(1) 4M x 36

28MB

(1) 4M x 36

(1) 1M x 36

(1) 2M x 36

None

28MB

(1) 1M x 36

(1) 4M x 36

(1) 2M x 36

None

32MB

None

None

(1) 4M x 36

(1) 4M x 36

40MB

(1) 2M x 36

None

(1) 4M x 36

(1) 4M x 36

40MB

(1) 4M x 36

(1) 4M x 36

(1) 2M x 36

None

48MB

None

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

128KB

(4) 32K x 8

None

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

512KB

(4) 128K x 8

None

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP13

JP15

JP16

128KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

256KB

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

512KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

CPU SPEED SELECTION

Speed

JP17

JP21

25MHz

Pins 1 & 5 closed

Pins 2 & 3 closed

33MHz

Pins 2 & 6 closed

Pins 2 & 3 closed

40MHz

Pins 3 & 7 closed

Pins 1 & 2 closed

50iMHz

Pins 1 & 5 closed

Pins 2 & 3 closed

50MHz

Pins 4 & 8 closed

Pins 1 & 2 closed

66iMHz

Pins 2 & 6 closed

Pins 2 & 3 closed

75iMHz

Pins 1 & 5 closed

Pins 2 & 3 closed

100iMHz

Pins 2 & 6 closed

Pins 2 & 3 closed

CPU TYPE SELECTION

Type

JP9

JP20

JP26

JP27

AM486SX

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

(SL)AM486SX

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

80486SX

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

AM486DX

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

(SL)AM486DX

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

CX486DX2

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Open

AM486DX2

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

(SL)AM486DX2

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX2

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

AM486DX4

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

(SL)AM486DX4

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX4

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

P24D

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

P24T

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

CPU TYPE SELECTION (CON’T)

Type

JP33

JP34

JP35

JP37

AM486SX

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

(SL)AM486SX

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

80486SX

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

AM486DX

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

(SL)AM486DX

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

80486DX

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

CX486DX2

Pins 2 & 4 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

AM486DX2

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

(SL)AM486DX2

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

80486DX2

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

AM486DX4

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

(SL)AM486DX4

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

80486DX4

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

P24D

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

P24T

Pins 1 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

CPU MULTIPLIER SELECTION (80486DX4 ONLY)

» Multiplier

JP22

»

2x

Pins 3 & 4 closed

»

2.5x

Pins 2 & 3 closed

»

3x

Pins 1 & 2 closed