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GA-486VF REV.8C

GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VF REV.8C

Processor

CX486M6/AM486/80486SX/80486DX/80486DX2/80486DX4/Pentium Overdrive

Processor Speed

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

Chip Set

SIS

Max. Onboard DRAM

128MB

Cache

64/128/256/512KB

BIOS

Award

Dimensions

230mm x 218mm

I/O Options

32-bit VESA local bus slots (3), green PC connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Power LED & keylock

J7

Turbo switch

J3

Green PC connector

JP33

Turbo LED

J4

Green PC LED connector

JP34

Speaker

J5

32-bit VESA local bus slots

S1 - S3

Reset switch

J6

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CPU type select all CPU’s

JP11

Closed

 

CPU type select AMD CPU only

JP11

Open

»

CMOS memory normal operation

JP16

pins 1 & 2 closed

 

CMOS memory clear

JP16

pins 2 & 3 closed

»

Monitor type select CGA

JP17

Closed

 

Monitor type select all others

JP17

Open

»

CPU type select all CPU types

JP21

pins 2 & 3 closed

 

CPU type select Cyrix, P24D, AMD enhanced CPU only

JP21

pins 1 & 2 closed

»

Green PC normal operation

JP26

Open

 

Green PC green mode

JP26

Closed

»

Cache type select write through

JP30

pins 2 & 3 closed

 

Cache type select write back

JP30

pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 256K x 9

(4) 4M x 9

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

65MB

(4) 256K x 9

(4) 16M x 9

68MB

(4) 1M x 9

(4) 16M x 9

80MB

(4) 4M x 9

(4) 16M x 9

128MB

(4) 16M x 9

(4) 16M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

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

256KB

(4) 64K x 8

NONE

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

512KB

(4) 128K x 8

NONE

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP1

JP2

JP3

JP4

64KB

Open

Open

Open

N/A

128KB

Closed

Open

Open

pins 1 & 2 closed

256KB

Closed

Closed

Open

pins 2 & 3 closed

256KB

Closed

Closed

Open

pins 1 & 2 closed

512KB

Closed

Closed

Closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP24

CX486M6

pins 2 & 3 closed

AM486SL

pins 2 & 5 closed

P24D

pins 2 & 5 closed

AM486DX4 2x

pins 3 & 4 closed

AM486DX4 3x

pins 3 & 4 open

80486DX4 2x

pins 3 & 4 closed

80486DX4 3x

pins 3 & 4 open

CPU TYPE CONFIGURATION

Type

JP8

JP18

CX486M6

N/A

Open

80486SX

pins 2 & 3 closed

Closed

80486DX

pins 1 & 2 closed

Closed

80486DX2

pins 1 & 2 closed

Closed

80486DX4

pins 1 & 2 closed

Closed

Pentium Overdrive

pins 1 & 2 closed

Closed

CPU SPEED CONFIGURATION

Speed

JP5

JP6

JP7

JP29

25MHz

Open

Open

Closed

Open

33MHz

Closed

Closed

Closed

Open

40MHz

Open

Closed

Closed

Closed

50iMHz

Open

Open

Closed

Open

50MHz

Closed

Open

Open

Closed

66iMHz

Closed

Closed

Closed

Open

75i (40 x 2) MHz

Open

Closed

Closed

Closed

75i (25 x 3) MHz

Open

Open

Closed

Open

100i (50 x 2) MHz

Closed

Open

Open

Closed

100i (33 x 3) MHz

Closed

Closed

Closed

Open

CPU VOLTAGE CONFIGURATION

Function

JP36

JP37

3.3 v

Open

Open

5 v

Closed

Closed

VOLTAGE DELAY CONFIGURATION

Function

J2

J8

J9

JP20

Normal card installed

1 & 2

1 & 2

1 & 2

2 & 3

Card installed needs address time

2 & 3

2 & 3

2 & 3

1 & 2

Note: Pins designated should be in closed position. Systems utilizing cards that need more address time are: DX4-100, DX4-75, DX2-66, DX-50, DX-40, DX-33.