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GA-486IM

GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486IM

Processor

CX486/AM486/UMC/80486SX/80486DX/80486DX2/80486DX4/P24D/ Pentium Overdrive

Processor Speed

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

Chip Set

UMC

Max. Onboard DRAM

128MB

Cache

32/64/128/256/512/1024KB

BIOS

Award

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2), 32-bit PCI slots (4), green PC connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J2

Turbo LED

JP24

Turbo switch

J3

Green PC LED

JP27

Speaker

J4

Green PC connector

JP28

Power LED & keylock

J5

32-bit PCI slots

PC1 - PC4

Green PC connector

JP12

32-bit VESA local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

P24D cache type select write through

JP6

pins 2 & 3 closed

 

P24D cache type select write back

JP6

pins 1 & 2 closed

»

Factory configured - do not alter

JP17

N/A

»

Factory configured - do not alter

JP22

N/A

DRAM CONFIGURATION

Size

Bank 0

Bank 1

2MB

(2) 256K x 36

NONE

4MB

(2) 512K x 36

NONE

4MB

(2) 256K x 36

(2) 256K x 36

6MB

(2) 256K x 36

(2) 512K x 36

6MB

(2) 512K x 36

(2) 256K x 36

8MB

(2) 512K x 36

(2) 512K x 36

8MB

(2) 1M x 36

NONE

10MB

(2) 256K x 36

(2) 1M x 36

10MB

(2) 1M x 36

(2) 256K x 36

12MB

(2) 512K x 36

(2) 1M x 36

12MB

(2) 1M x 36

(2) 512K x 36

16MB

(2) 1M x 36

(2) 1M x 36

16MB

(2) 2M x 36

NONE

18MB

(2) 256K x 36

(2) 2M x 36

18MB

(2) 2M x 36

(2) 256K x 36

20MB

(2) 512K x 36

(2) 2M x 36

20MB

(2) 2M x 36

(2) 512K x 36

24MB

(2) 1M x 36

(2) 2M x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 2M x 36

(2) 2M x 36

32MB

(2) 4M x 36

NONE

34MB

(2) 256K x 36

(2) 4M x 36

34MB

(2) 4M x 36

(2) 256K x 36

36MB

(2) 512K x 36

(2) 4M x 36

36MB

(2) 4M x 36

(2) 512K x 36

40MB

(2) 1M x 36

(2) 4M x 36

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 2M x 36

(2) 4M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 4M x 36

(2) 4M x 36

64MB

(2) 8M x 36

NONE

66MB

(2) 256K x 36

(2) 8M x 36

66MB

(2) 8M x 36

(2) 256K x 36

68MB

(2) 512K x 36

(2) 8M x 36

68MB

(2) 8M x 36

(2) 512K x 36

72MB

(2) 1M x 36

(2) 8M x 36

72MB

(2) 8M x 36

(2) 1M x 36

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

80MB

(2) 2M x 36

(2) 8M x 36

80MB

(2) 8M x 36

(2) 2M x 36

96MB

(2) 4M x 36

(2) 8M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

256KB

(4) 64K x 8

NONE

(1) 32K x 8

512KB

(4) 128K x 8

NONE

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP19

JP20

JP21

JP26

128KB

Open

Open

Closed

pins 2 & 3 closed

256KB

Open

Closed

Closed

pins 1 & 2 closed

256KB

Open

Closed

Closed

pins 2 & 3 closed

512KB

Closed

Closed

Closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP3

JP16

Cyrix

pins 1 & 2 closed

N/A

AMD

pins 1 & 2 closed

N/A

UMC

pins 1 & 2 closed

N/A

80486SX

N/A

pins 2 & 3 closed

80486DX

N/A

pins 1 & 2 closed

Intel

pins 1 & 2 closed

N/A

Intel S-series

pins 3 & 4 closed

N/A

CPU TYPE CONFIGURATION

Type

RN1

RN2

RN3

RN4

RN5

Cyrix

Installed

Not installed

Not installed

Installed

Not installed

AMD

Not installed

Not installed

Installed

Not installed

Not installed

UMC

Not installed

Not installed

Installed

Not installed

Not installed

Intel

Not installed

Installed

Not installed

Not installed

Installed

CPU TYPE CONFIGURATION

Type

JP1

JP13

Cyrix

pins 1 & 2, 3 & 4 closed

Open

AMD

pins 5 & 6, 7 & 8 closed

Open

UMC

pins 5 & 6, 7 & 8 closed

Open

Intel

pins 3 & 4, 5 & 6 closed

Closed

CPU SPEED CONFIGURATION

Speed

JP2

25MHz

pins 1 & 2 closed

33MHz

pins 1 & 2, 3 & 4, 5 & 6 closed

40MHz

pins 1 & 2, 3 & 4 closed

50iMHz

pins 1 & 2 closed

50MHz

pins 5 & 6 closed

66iMHz

pins 1 & 2, 3 & 4, 5 & 6 closed

75iMHz

pins 1 & 2 closed

100iMHz

pins 1 & 2, 3 & 4, 5 & 6 closed

CPU SPEED CONFIGURATION (80486DX4 ONLY)

Speed

JP4

JP23

2x

Closed

pins 2 & 3 closed

3x

Open

pins 2 & 3 closed

BUS SPEED CONFIGURATION

CPU speed

JP25

<= 33MHz

Open

> 33MHz

Closed

VESA DELAY CONFIGURATION

Setting

JP7

JP15

Normal card installed

pins 1 & 2 closed

pins 1 & 2 closed

Card installed needs address setup time

pins 2 & 3 closed

pins 2 & 3 closed