IT486SMVG MINI Motherboard Settings and Configuration

Processor

CX486DX2/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

FOREX

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

J6

External battery

JP1

Speaker

J7

32-bit VESA Local bus slot

S1

Turbo switch

J8

32-bit VESA Local bus slot

S2

Power LED & keylock

J9

32-bit VESA Local bus slot

S3

Reset switch

J10

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CPU PQFP enabled

JP5

Open

CPU PQFP disabled

JP5

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

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) 32K x 4

CACHE JUMPER CONFIGURATION

Size

JP8A

JP8B

JP8C

64KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

128KB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP2

JP3

JP4

JP12

JP20

80486SX

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 1 & 2

N/A

80487SX

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

N/A

CX486DX

N/A

N/A

N/A

N/A

Open

80486DX

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

N/A

80486DX (PQFP)

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 1 & 2

N/A

ODP486SX

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

N/A

CX486DX2

N/A

N/A

N/A

N/A

Closed

80486DX2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

N/A

Pentium Overdrive

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

N/A

Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JP7A

JP7B

JP7C

20MHz

Open

Closed

Closed

25MHz

N/A

Open

Open

33MHz

Open

Open

Open

40MHz

Closed

Closed

Open

50i MHz

N/A

Open

Open

50MHz

Open

Closed

Open

66i MHz

Open

Open

Open

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

JP10

JP11

< 33 MHz

0 wait states

pins 1 & 2 closed

pins 1 & 2 closed

> 33 MHz

1 wait state

pins 2 & 3 closed

pins 2 & 3 closed