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GA-486VT

GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VT

Processor

80486SX/80487SX/CX486S/CX486S2/80486DX/

80486DX2/Pentium Overdrive

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

230mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J2

Power LED & keylock

J9

Turbo LED

J5

32-bit VESA Local bus slot

S1

Reset switch

J6

32-bit VESA Local bus slot

S2

Turbo switch

J7

32-bit VESA Local bus slot

S3

Speaker

J8

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J3

pins 1 & 2 closed

 

CMOS memory clear

J3

pins 2 & 3 closed

Monitor type select CGA

J11

Closed

 

Monitor type select all others

J11

Open

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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M 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) 32K x 8

CACHE JUMPER CONFIGURATION

Size

W0

W1

W2

W3

W4

64KB

pins 1 & 2

Open

Open

pins 1 & 2

pins 1 & 2

128KB

pins 1 & 2

Closed

Open

pins 2 & 3

pins 2 & 3

256KB

pins 2 & 3

Closed

Closed

pins 1 & 2

pins 2 & 3

Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP3

JP10

W6

80486SX

Open

pins 1 & 2 closed

pins 2 & 3 closed

80487SX

Open

pins 1 & 2 closed

pins 1 & 2 closed

CX486S

Open

pins 1 & 2 closed

pins 2 & 3 closed

CX486S2

Closed

pins 1 & 2 closed

pins 2 & 3 closed

80486DX

Open

pins 1 & 2 closed

pins 1 & 2 closed

80486DX2

Open

pins 1 & 2 closed

pins 1 & 2 closed

Pentium Overdrive

Open

pins 2 & 3 closed

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP2

JP6

W5

20MHz

pins 1 & 2 closed

Open

Open

25MHz

pins 1 & 2 closed

Open

Open

33MHz

pins 1 & 2 closed

Open

Open

40MHz

pins 2 & 3 closed

Closed

Closed

50i MHz

pins 1 & 2 closed

Open

Open

50MHz

pins 2 & 3 closed

Closed

Open

66i MHz

pins 1 & 2 closed

Open

Open

VESA CONFIGURATION

Setting

JP5

0 wait states

Open

1 wait state

Closed