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

330mm x 218mm

I/O Options

32-bit PCI local bus slots (4)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Green PC

J1

Power LED & keylock

J27

Turbo switch

J23

32-bit PCI local bus slot

PCI1

Turbo LED

J24

32-bit PCI local bus slot

PCI2

Reset switch

J25

32-bit PCI local bus slot

PCI3

Speaker

J26

32-bit PCI local bus slot

PCI4

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Green PC normal operation

JP13

Open

Green PC sleep mode

JP13

Closed

»

CMOS memory normal operation

JP14

Open

CMOS memory clear

JP14

Closed

»

Cache disabled

JP20

Closed

Cache enabled

JP20

Open

»

Factory configured - do not alter

JP21

Closed

»

Factory configured - do not alter

JP24

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 36

NONE

16MB

(2) 1M x 36

(2) 1M x 36

16MB

(2) 2M x 36

NONE

32MB

(2) 2M x 36

(2) 2M x 36

32MB

(2) 4M x 36

NONE

40MB

(2) 1M x 36

(2) 4M x 36

64MB

(2) 4M x 36

(2) 4M x 36

48MB

(2) 2M x 36

(2) 4M x 36

128MB

(2) 16M x 36

NONE

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

Dirty Bit

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

(1) 64K x 1

128KB

(4) 32K x 8

NONE

(1) 32K x 8

(1) 64K x 1

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

(1) 64K x 1

512KB

(4) 128K x 8

NONE

(1) 32K x 8

(1) 64K x 1

CACHE JUMPER CONFIGURATION

Size

JP11

JP12

JP16

JP17

64KB

Open

Open

Closed

Closed

128KB

pins 1 & 2 closed

pins 1 & 2 closed

Closed

Open

256KB

pins 3 & 4 closed

pins 3 & 4 closed

Open

Closed

512KB

pins 2 & 3 closed

pins 2 & 3 closed

Open

Open

CPU TYPE CONFIGURATION

Type

JP10

JP15

JP18

JP23

JP25

80486SX

pins 1 & 2

Closed

pins 2 & 3

pins 2 & 3

pins 1 & 2

80487SX

pins 1 & 2

Closed

1 & 2 and 3 & 4

pins 1 & 2

pins 1 & 2

80486DX

pins 1 & 2

Closed

1 & 2 and 3 & 4

pins 2 & 3

pins 2 & 3

ODP486SX

pins 1 & 2

Closed

1 & 2 and 3 & 4

pins 1 & 2

pins 1 & 2

80486DX2

pins 1 & 2

Closed

1 & 2 and 3 & 4

pins 2 & 3

pins 2 & 3

Pentium Overdrive

pins 2 & 3

Open

1 & 2 and 3 & 4

pins 1 & 2

pins 1 & 2

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JP19

25MHz

Closed

33MHz

Open

50i MHz

Closed

66i MHz

Open

FLASH WRITE ENABLED

Setting

JP7

JP8

»

Normal mode

pins 1 & 2 closed

pins 1 & 2 closed

Flash write mode

pins 2 & 3 closed

pins 2 & 3 closed

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

JP22

£ 33MHz

0 wait states

Open

> 33MHz

1 wait state

Closed

MISCELLANEOUS TECHNICAL NOTE

Note: JP1 through JP5 are used for PCI interrupt selection. These jumpers are factory configured--do not alter.