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GA-486IS

GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486IS

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

Intel

Max. Onboard DRAM

128MB

Cache

64/128/256/512KB

BIOS

AMI

Dimensions

230mm x 218mm

I/O Options

32-bit PCI local bus slots (4)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J1

Power down mode LED

JP27

Speaker

J2

32-bit PCI Local bus slot

S1

Turbo LED

J3

32-bit PCI Local bus slot

S2

External power control port

J5

32-bit PCI Local bus slot

S3

Reset switch

JP9

32-bit PCI Local bus slot

S4

Turbo switch

JP21

   

c

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J4

Open

 

CMOS memory clear

J4

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 3

2MB

(2) 1M x 36

NONE

4MB

(2) 1M x 36

(2) 1M x 36

4MB

(2) 2M x 36

NONE

6MB

(2) 2M x 36

(2) 1M x 36

8MB

(2) 2M x 36

(2) 2M x 36

8MB

(2) 4M x 36

NONE

10MB

(2) 4M x 36

(2) 1M x 36

12MB

(2) 4M x 36

(2) 2M x 36

16MB

(2) 4M x 36

(2) 4M x 36

16MB

(2) 8M x 36

NONE

18MB

(2) 8M x 36

(2) 1M x 36

20MB

(2) 8M x 36

(2) 2M x 36

24MB

(2) 8M x 36

(2) 4M x 36

32MB

(2) 8M x 36

(2) 8M x 36

32MB

(2) 16M x 36

NONE

34MB

(2) 16M x 36

(2) 1M x 36

36MB

(2) 16M x 36

(2) 2M x 36

40MB

(2) 16M x 36

(2) 4M x 36

48MB

(2) 16M x 36

(2) 8M x 36

64MB

(2) 16M x 36

(2) 16M x 36

64MB

(2) 32M x 36

NONE

128MB

(2) 32M x 36

(2) 32M x 36

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

512KB

(4) 128K x 8

NONE

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

J6

J7

J9

JP11

JP12

64KB

Open

Open

Open

Closed

Closed

128KB

Open

Closed

Open

Closed

Open

256KB

Closed

Closed

Open

Open

Closed

512KB

Closed

Closed

Closed

Open

Open

CPU TYPE CONFIGURATION

Type

JP10

80486SX

pins 2 & 3 closed

80487SX

pins 2 & 3 closed

80486DX

pins 1 & 2 closed

ODP486SX

pins 1 & 2 closed

80486DX2

pins 1 & 2 closed

Pentium Overdrive

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP7

JP18

25MHz

pins 2 & 3 closed

Closed

33MHz

pins 1 & 2 closed

Open

50iMHz

pins 2 & 3 closed

Closed

66iMHz

pins 1 & 2 closed

Open

PCI IRQ INTERRUPT CONFIGURATION

IRQ

JP20

JP21

JP22

JP23

9

Closed

Open

Open

Open

10

Open

Closed

Open

Open

11

Open

Open

Closed

Open

14

Open

Open

Open

Closed