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AP55CS

ACER, INC.

AP55CS

Device Type

Mainboard

Processor

CX 6X86/Pentium

Processor Speed

75/90/100/120/133/150/166MHz

Chip Set

SIS

Video Chip Set

Unidentified

Maximum Onboard Memory

128MB (EDO supported) Unified Memory Architecture (UMA)

Cache

256KB

BIOS

AMI

Dimensions

280mm x 220mm

I/O Options

32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, serial ports (2), VGA feature connector, VGA port, VRM connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

IDE interface LED

JP16

Serial port 2

CN2

Power LED & keylock

JP24/pins 1 – 5

Floppy drive interface

CN3

Speaker

JP24/pins 7 – 10

Parallel port

CN4

Turbo LED

JP24/pins 12 & 13

IDE interface 2

CN5

Turbo switch

JP24/pins 15 – 17

IDE interface 1

CN6

Reset switch

JP24/pins 19 & 20

VGA feature connector

CN7

32-bit PCI slots

PC1 – PC3

VGA port

J3

VRM connector

VRM

CPU fan power

J7

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

JP2

Unidentified

»

Factory configured - do not alter

JP3

Unidentified

»

Factory configured - do not alter

JP5

Unidentified

»

Factory configured - do not alter

JP8

Unidentified

»

Factory configured - do not alter

JP13

Unidentified

 

On board I/O enabled

JP14

Pins 1 & 2 closed

 

On board I/O disabled

JP14

Pins 2 & 3 closed

»

Factory configured - do not alter

JP17

Unidentified

»

CMOS memory normal operation

JP19

Pins 1 & 2 closed

 

CMOS memory clear

JP19

Pins 2 & 3 closed

SIMM CONFIGURATION

Size

Bank 0

Bank 1

2MB

(2) 256K x 36

None

4MB

(2) 512K x 36

None

4MB

(2) 256K x 36

(2) 256K x 36

6MB

(2) 512K x 36

(2) 256K x 36

8MB

(2) 512K x 36

(2) 512K x 36

8MB

(2) 1M x 36

None

10MB

(2) 1M x 36

(2) 256K x 36

12MB

(2) 1M x 36

(2) 512K x 36

16MB

(2) 2M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

18MB

(2) 2M x 36

(2) 256K x 36

SIMM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

20MB

(2) 2M x 36

(2) 512K x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 4M x 36

None

32MB

(2) 2M x 36

(2) 2M x 36

34MB

(2) 4M x 36

(2) 256K x 36

36MB

(2) 4M x 36

(2) 512K x 36

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 8M x 36

None

64MB

(2) 4M x 36

(2) 4M x 36

66MB

(2) 8M x 36

(2) 256K x 36

68MB

(2) 8M x 36

(2) 512K x 36

72MB

(2) 8M x 36

(2) 1M x 36

80MB

(2) 8M x 36

(2) 2M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

Note: Board accepts EDO memory.

CACHE CONFIGURATION

Size

Bank 0

256KB

(2) 32K x 32

CACHE TYPE CONFIGURATION

Type

JP1

Linear mode

Pins 1 & 2 closed

Interleave mode

Pins 2 & 3 closed

CPU SPEED SELECTION (CX 6X86)

CPU speed

Clock speed

Multiplier

JP9

JP10

JP22

JP23

120MHz

50MHz

2x

2 & 3

2 & 3

Open

Open

150MHz

60MHz

2x

2 & 3

1 & 2

Open

Open

166MHz

66MHz

2x

1 & 2

2 & 3

Open

Open

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)

CPU speed

Clock speed

Multiplier

JP9

JP10

JP22

JP23

75MHz

50MHz

1.5x

2 & 3

2 & 3

2 & 3

2 & 3

90MHz

60MHz

1.5x

2 & 3

1 & 2

2 & 3

2 & 3

100MHz

66MHz

1.5x

1 & 2

2 & 3

2 & 3

2 & 3

120MHz

60MHz

2x

2 & 3

1 & 2

1 & 2

2 & 3

133MHz

66MHz

2x

1 & 2

2 & 3

1 & 2

2 & 3

150MHz

60MHz

2.5x

2 & 3

1 & 2

1 & 2

1 & 2

166MHz

66MHz

2.5x

1 & 2

2 & 3

1 & 2

1 & 2

Note: Pins designated should be in the closed position.

DMA CHANNEL SELECTION

Channel

JP11

JP12

1

Pins 2 & 3 closed

Pins 2 & 3 closed

3

Pins 1 & 2 closed

Pins 1 & 2 closed

ON BOARD VIDEO SELECTION

Setting

JP4

JP6

JP7

Enabled

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

Disabled

Open

Pins 2 & 3 closed

Pins 3 & 4 closed

FLASH BIOS SELECTION

Setting

JP18

5v

Pins 2 & 3, 5 & 6 closed

12v

Pins 1 & 2, 5 & 6 closed

EEPROM

Pins 2 & 3, 4 & 5 closed