Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

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

Chip Set

Biostar

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP8

Reset switch

JP15/pins 12 - 13

Speaker

JP15/pins 1 - 4

Turbo switch

JP15/pins 15 - 16

Keylock & power LED

JP15/pins 5 - 9

5 volt ground

JP15/pins 17 - 18

Turbo LED

JP15/pins 10 - 11

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured-do not alter

JP4

pins 2 & 3 closed

Tag RAM select 7-bit

JP6

pins 1 & 2 closed

Tag RAM select 8-bit

JP6

pins 2 & 3 closed

»

Battery & RTC chip select

JP11

Open

Dallas 1287 chip select

JP11

Closed

»

Monitor type select color

JP14

pins 1 & 2 closed

Monitor type select monochrome

JP14

pins 2 & 3 closed

»

CMOS normal operation

JP16

pins 2 & 3 closed

CMOS clear

JP16

pins 1 & 2 closed

CLOCK SPEED SELECT

Speed

JP5

JP10

50MHz

pins 1 & 2 closed

Closed

Other

pins 2 & 3 closed

Open

CPU TYPE SELECT

Type

JP13

JP20

80486SX

Open

pins 1 & 2 closed

80487SX/80486 Overdrive

pins 1 & 2 closed

pins 2 & 3 closed

80486DX/DX2

pins 2 & 3 closed

pins 2 & 3 closed

CACHE CONFIGURATION

Cache 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 8

CACHE JUMPER CONFIGURATION

Cache Size

JP12

JP19

64KB

Open

pins 1 & 2 closed

128KB

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

256KB

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

pins 1 & 2 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) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9