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V55-2

ACER, INC.

V55-2

Device Type

Mainboard

Processor

Pentium/Pentium MMX/ CX 6x86/AM K5/IBM 6x86

Processor Speed

75/90/100/120/133/150/166/200 MHz

Chip Set

Unidentified

Maximum Onboard Memory

128MB (EDO & SDRAM supported)

Cache

256/512KB

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options (CPU)

32-bit ISA slots (3), 32-bit PCI slots (4), bus mouse port, PS/2 keyboard port, serial ports (2), parallel port

CONNECTIONS

Purpose

Location

Purpose

Location

Standby power connector

CN1

Speaker

CN16/pins 7 - 10

Serial port 2

CN2

Turbo LED

CN16/pins 12 & 13

Serial port 1

CN3

Reset

CN16/pins 19 & 20

Parallel port

CN4

External suspend switch

CN17

Floppy drive interface

CN5

Software shutdown switch

CN18

IDE interface 2

CN6

IrDA connector

CN19

IDE interface 1

CN9

IDE interface LED

CN20

CPU power shorting block

CN13

PS/2 mouse port

CN21

CPU fan connector

CN14

32-bit PCI expansion slots

PC1-PC4

Keylock

CN16/pins 1 & 2

Cache slot

SL1

Power LED

CN16/pins 3 - 5

 

 

USER CONFIGURABLE SETTINGS

Function

Label

Position

ROM type select Flash ROM

JP4

Pins 2 & 3 closed

 

ROM type select EPROM

JP4

Pins 1 & 2 closed

CPU core voltage select 2.8v

JP6

Pins 2 & 3 closed

 

CPU core voltage select 3.2v

JP6

Pins 1 & 2 closed

CPU I/O voltage select 3.3v

JP7

Pins 2 & 3 closed

 

CPU I/O voltage select 3.5v

JP7

Pins 1 & 2 closed

Factory configured - do not alter

JP10

Pins 2 & 3 closed

 

CMOS discharge normal

JP11

Open

 

CMOS discharge clear

JP11

Closed

ROM BRAND SELECTION

Brand

JP5

29EE010

Pins 2 & 3 closed

 

NC

Pins 1 & 2 closed

 

29F001

Pins 3 & 4 closed

SIMM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 32

None

16MB

(2) 2M x 32

None

16MB

(2) 1M x 32

(2) 1M x 32

24MB

(2) 2M x 32

(2) 1M x 32

32MB

(2) 4M x 32

None

32MB

(2) 2M x 32

(2) 2M x 32

40MB

(2) 4M x 32

(2) 1M x 32

48MB

(2) 4M x 32

(2) 2M x 32

64MB

(2) 8M x 32

None

64MB

(2) 4M x 32

(2) 4M x 32

72MB

(2) 8M x 32

(2) 1M x 32

80MB

(2) 8M x 32

(2) 2M x 32

96MB

(2) 8M x 32

(2) 4M x 32

128MB

(2) 8M x 32

(2) 8M x 32

CACHE CONFIGURATION

Size

SL1

Tag

Bank 0

256KB

(2) 32K x 32

(8) 32K x 32

(2) 32K x 32

512KB

(4) 32K x 32

(8) 32K x 32

(4) 32K x 32

512KB

(2) 64K x 32

(8) 32K x 32

(2) 64K x 32

Note: The location of Tag SRAM is unidentified.

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

256KB

Pins 2 & 3 closed

Pins 2 & 3 closed

 

512KB

Pins 1 & 2 closed

Pins 1 & 2 closed

CPU FREQUENCY SELECTION (INTEL)

CPU

Clock Speed

Clock Ratio

SW1/1

SW1/2

SW1/3

SW1/4

75MHz

50MHz

1.5x

Off

Off

On

On

90MHz

60MHz

1.5x

Off

Off

Off

On

100MHz

66MHz

1.5x

Off

Off

On

Off

120MHz

60MHz

2x

Off

On

Off

On

133MHz

66MHz

2x

Off

On

On

Off

150MHz

60MHz

2.5x

On

On

Off

On

166MHz

66MHz

2.5x

On

On

On

Off

CPU FREQUENCY SELECTION (INTEL MMX)

CPU

Clock Speed

Clock Ratio

SW1/1

SW1/2

SW1/3

SW1/4

166MHz

66MHz

2.5x

On

On

On

Off

180MHz

60MHz

3x

On

Off

Off

On

200MHz

66MHz

3x

On

Off

On

Off

CPU FREQUENCY SELECTION (AM K5)

CPU

Clock Speed

Clock Ratio

SW1/1

SW1/2

SW1/3

SW1/4

75MHz

50MHz

1.5x

Off

Off

On

On

90MHz

60MHz

1.5x

Off

Off

Off

On

100MHz

66MHz

1.5x

Off

Off

On

Off

120MHz

60MHz

2x

Off

On

Off

On

133MHz

66MHz

2x

Off

On

On

Off

150MHz

60MHz

2.5x

On

On

Off

On

166MHz

66MHz

2.5x

On

On

On

Off

CPU FREQUENCY SELECTION (CX 6X86)

CPU

Host Bus

Clock Ratio

SW1/1

SW1/2

SW1/3

SW1/4

120MHz

50MHz

2x

Off

On

On

On

150MHz

60MHz

2x

Off

On

Off

On

166MHz

66MHz

2x

Off

On

On

Off

CPU FREQUENCY SELECTION (IBM 6X86)

CPU

Host Bus

Clock Ratio

SW1/1

SW1/2

SW1/3

SW1/4

120MHz

50MHz

2x

Off

On

On

On

150MHz

60MHz

2x

Off

On

Off

On

166MHz

66MHz

2x

Off

On

On

Off