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GA-486VC

GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VC

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

64MB

Cache

64/128/256/512KB

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

J1

Turbo LED

JP6

Turbo switch

J2

External power control port

JP15

Speaker

J3

32-bit VESA Local bus slot

S1

Power LED & keylock

J4

32-bit VESA Local bus slot

S2

Reset switch

J5

32-bit VESA Local bus slot

S3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

JP13

pins 1 & 2 closed

 

CMOS memory clear

JP13

pins 2 & 3 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) 1M x 9

NONE

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

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/(1) 32K x 8

512KB

(4) 128K x 8

NONE

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP4

JP5

64KB

pins 1 & 2 closed

Open

Open

Open

128KB

pins 2 & 3 closed

Open

Open

Closed

256KB

pins 1 & 2 closed

Open

Closed

Closed

512KB

pins 2 & 3 closed

Closed

Closed

Closed

CPU TYPE CONFIGURATION

Type

JP18

JP19

80486SX

pins 2 & 3 closed

Open

80487SX

pins 1 & 2 closed

Open

CX486S

N/A

Open

CX486S2

N/A

Closed

80486DX

pins 1 & 2 closed

Open

80486DX2

pins 1 & 2 closed

Open

Pentium Overdrive

pins 1 & 2 closed

Open

CPU SPEED CONFIGURATION

Speed

JP10

JP11

JP12

JP14

JP17

20MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

Open

25MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

Open

33MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

Open

40MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

Closed

50i MHz

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

Open

50MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

Closed

66i MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

Open