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PB4 (REV.1.1)

ABIT COMPUTER CORPORATION

PB4 (REV.1.1)

Processor

80486SX/SL AM486DX/80486DX/CX486DX2/AM486DX2/80486DX2/ CX486DX4/80486DX4/CX M1/P24D/Pentium Overdrive

Processor Speed

25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)/ 120(internal)MHz

Chip Set

Unidentified

Max. Onboard DRAM

64MB

Cache

128/256KB

BIOS

Award

Dimensions

220mm x 220mm

I/O Options

32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2), PISA slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Floppy drive interface

CN1

Power LED & keylock

JW1

Parallel port

CN2

Speaker

JW2

IDE interface 2

CN3

Turbo LED

JW3

IDE interface 1

CN4

Turbo switch

JW4

Serial port 2

J3

Reset switch

JW5

Serial port 1

J4

32-bit PCI slots

PC1 - PC3

IDE interface LED

JP16

PISA slot

SL1

External battery

JP18

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

JP12

pins 1 & 2 closed

»

Factory configured - do not alter

JP13

Open

»

Factory configured - do not alter

JP14

Open

»

CMOS memory normal operation

JP17

pins 1 & 2 closed

 

CMOS memory clear

JP17

pins 2 & 3 closed

Note: The location of jumpers JP12 and JP14 are unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(1) 256K x 36

NONE

2MB

(1) 512K x 36

NONE

2MB

(1) 256K x 36

(1) 256K x 36

3MB

(1) 256K x 36

(1) 512K x 36

3MB

(1) 512K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

4MB

(1) 512K x 36

(1) 512K x 36

5MB

(1) 256K x 36

(1) 1M x 36

5MB

(1) 1M x 36

(1) 256K x 36

6MB

(1) 512K x 36

(1) 1M x 36

6MB

(1) 1M x 36

(1) 512K x 36

8MB

(1) 2M x 36

NONE

8MB

(1) 1M x 36

(1) 1M x 36

9MB

(1) 256K x 36

(1) 2M x 36

9MB

(1) 2M x 36

(1) 256K x 36

10MB

(1) 512K x 36

(1) 2M x 36

10MB

(1) 2M x 36

(1) 512K x 36

12MB

(1) 1M x 36

(1) 2M x 36

12MB

(1) 2M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

16MB

(1) 2M x 36

(1) 2M x 36

17MB

(1) 256K x 36

(1) 4M x 36

17MB

(1) 4M x 36

(1) 256K x 36

18MB

(1) 512K x 36

(1) 4M x 36

18MB

(1) 4M x 36

(1) 512K x 36

20MB

(1) 1M x 36

(1) 4M x 36

20MB

(1) 4M x 36

(1) 1M x 36

24MB

(1) 2M x 36

(1) 4M x 36

24MB

(1) 4M x 36

(1) 2M x 36

32MB

(1) 8M x 36

NONE

32MB

(1) 4M x 36

(1) 4M x 36

33MB

(1) 256K x 36

(1) 8M x 36

33MB

(1) 8M x 36

(1) 256K x 36

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

34MB

(1) 512K x 36

(1) 8M x 36

34MB

(1) 8M x 36

(1) 512K x 36

36MB

(1) 1M x 36

(1) 8M x 36

36MB

(1) 8M x 36

(1) 1M x 36

40MB

(1) 2M x 36

(1) 8M x 36

40MB

(1) 8M x 36

(1) 2M x 36

48MB

(1) 4M x 36

(1) 8M x 36

48MB

(1) 8M x 36

(1) 4M x 36

64MB

(1) 8M x 36

(1) 8M x 36

CACHE CONFIGURATION

Size

Bank 0

TAG

128KB

(4) 32K x 8

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

256KB

(4) 64K x 8

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

CACHE JUMPER CONFIGURATION

Size

JP3

128KB

pins 1 & 2 closed

256KB

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP5

JP8

JP9

80486SX

Open

Open

Open

SL AM486DX

pins 2 & 3 closed

Open

pins 1 & 2 closed

80486DX

Open

Open

Open

CX486DX2

pins 1 & 2 closed

Open

pins 2 & 3 closed

AM486DX2

Open

Closed

Open

80486DX2

Open

Open

Open

CX486DX4

pins 1 & 2 closed

Open

pins 2 & 3 closed

AM486DX4

Open

Open

Open

80486DX4

Open

Open

Open

CX M1

pins 2 & 3 closed

Open

pins 1 & 2 closed

P24D

pins 2 & 3 closed

Open

pins 1 & 2 closed

P24T

Open

Open

Open

CPU TYPE CONFIGURATION

Type

RJ1

RJ2

RJ3

80486SX

pins 1 - 8 closed

Installed

Not installed

SL AM486DX

pins 3 - 10 closed

Installed

Not installed

80486DX

pins 1 - 8 closed

Installed

Not installed

CX486DX2

pins 1 - 8 closed

Not installed

Installed

AM486DX2

pins 1 - 8 closed

Installed

Not installed

80486DX2

pins 1 - 8 closed

Installed

Not installed

CX486DX4

pins 1 - 8 closed

Not installed

Installed

AM486DX4

pins 1 - 8 closed

Installed

Not installed

80486DX4

pins 1 - 8 closed

Installed

Not installed

CX M1

pins 1 - 8 closed

Installed

Not installed

P24D

pins 3 - 10 closed

Installed

Not installed

P24T

pins 7 - 14 closed

Installed

Not installed

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JP4

JP11

25MHz

Open

Open

33MHz

Closed

Closed

40MHz

Closed

Open

50iMHz

Open

Open

66iMHz

Closed

Closed

75iMHz

Open

Open

80iMHz

Closed

Open

100iMHz

Closed

Closed

120iMHz

Closed

Open

CPU VOLTAGE CONFIGURATION

Voltage

JP1

JP2

3.45v

pins 1 & 2 closed

pins 2 & 3 closed

3.6v

pins 2 & 3 closed

pins 2 & 3 closed

4v

pins 4 & 5 closed

pins 2 & 3 closed

5v

pins 1 & 2 closed

pins 1 & 2 closed