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Processor

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

Processor Speed

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

Chip Set

SIS

Max. Onboard DRAM

64MB

Cache

64/128/256/512KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

IDE interface, parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

32-bit VESA Local bus slots

J1 & J2

Turbo switch

S6

Turbo LED

S1

IDE interface

S10

Reset switch

S2

Floppy drive interface

S11

Hard drive LED

S3

Parallel port

S12

Speaker

S4

Serial port 1

S13

Power LED & keylock

S5

Serial port 2

S14

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

JP6

Closed

Monitor type select monochrome, VGA or EGA

JP16

Open

Monitor type select CGA

JP16

Closed

IDE interface enabled

JP17

Open

IDE interface disabled

JP17

Closed

Factory configured - do not alter

JP18

Closed

Parallel port select interrupt IRQ7

JP22

pins 1 & 2 closed

Parallel port select interrupt IRQ5

JP22

pins 2 & 3 closed

Factory configured - do not alter

JP27

Closed

Flash BIOS write protect disabled

JP28

pins 1 & 2 closed

Flash BIOS write protect enabled

JP28

pins 2 & 3 closed

Factory configured - do not alter

JP31

Closed

Normal password operation

JP32

Open

BIOS password clear

JP32

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

2MB

(1) 512K x 36

None

None

4MB

(1) 512K x 36

None

(1) 512K x 36

4MB

(1) 1M x 36

None

None

6MB

(1) 512K x 36

None

(1) 1M x 36

8MB

(1) 1M x 36

(1) 1M x 36

None

8MB

(1) 2M x 36

None

None

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

12MB

(1) 2M x 36

None

(1) 1M x 36

16MB

(1) 2M x 36

None

(1) 2M x 36

16MB

(1) 4M x 36

None

None

20MB

(1) 1M x 36

(1) 4M x 36

None

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

24MB

(1) 2M x 36

None

(1) 4M x 36

32MB

(1) 4M x 36

(1) 4M x 36

None

40MB

(1) 1M x 36

(1) 1M x 36

(1) 8M x 36

40MB

(1) 2M x 36

None

(1) 8M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 8M x 36

None

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 8M x 36

64MB

(1) 8M x 36

None

(1) 8M x 36

CACHE SIZE JUMPER CONFIGURATION

Size

JP7

JP8

JP9

JP10

JP11

JP12

JP13

JP14

JP15

64KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

128KB

1 & 2

1 & 2

2 & 3

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

1 & 2

256KB

2 & 3

1 & 2

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

2 & 3

2 & 3

1 & 2

Note:Pins designated should be in the closed position.

CACHE SIZE AND SRAM LOCATIONS

Cache Size

Bank 0

Bank 1

TAG

Dirty Bit

64KB

(4) 8K x 8

(4 ) 8K x 8

(1) 8K x 8

(1) 16K x 1

128KB

(4) 32K x 8

None

(1) 32K x 8

(1) 16K x 1

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

(1) 16K x 1

512KB

(4) 128K x 8

None

(1) 32K x 8

(1) 16K x 4

CPU EXTERNALCLOCK SPEED

Speed

JP3

JP4

JP5

20MHz

Open

Closed

Closed

25MHz

Closed

Open

Closed

33MHz

Closed

Closed

Open

40MHz

Open

Open

Closed

50i MHz

Closed

Open

Closed

50MHz

Open

Closed

Open

66i MHz

Closed

Closed

Open

CPU TYPE

Type

JP1

JP2

80486SX

Open

pins 2 & 3 closed

80487SX

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

ODP486SX

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

80486DX2

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

Pentium Overdrive

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

IDE RECOVERY TIME

Time

JP29

JP30

300ns

Closed

Closed

240ns

Open

Closed

180ns

Closed

Open

120ns

Open

Open

SCSI ADDRESS

Address

W1/pins 3 & 4

W1/pins 5 & 6

DC000h enabled

Closed

Closed

DC000h disabled

Closed

N/A

DC8000h enabled

N/A

Closed

DC8000h disabled

Closed

Closed

SCSI PORT CONFIGURATION

Setting

IRQ

W1/1 & 2

W1/7 & 8

W1/9 & 10

Enabled

11

Closed

Closed

Open

Disabled

10

Open

Open

Closed