SQUARE ONE INDUSTRIES, INC.

S1-486

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

32-bit external memory card

CN1

Turbo LED

JP12

External battery

J10

Reset switch

SW1

Power LED & keylock

J23

Turbo switch

SW2

Speaker

J24

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

JP1

Closed

 

Monitor type select monochrome

JP1

Open

»

CMOS memory normal operation

JP2

pins 2 & 3 closed

 

CMOS memory clear

JP2

pins 1 & 2 closed

»

Bus speed select CLK2/6

JP3

Closed

 

Bus speed select CLK2/4

JP3

Open

»

CPU oscillator select single phase

JP4

pins 1 & 2 closed

 

CPU oscillator select double phase

JP4

pins 2 & 3 closed

»

Factory configured - do not alter

JP10

Open

»

Factory configured - do not alter

JP13

Open

»

Factory configured - do not alter

JP14

Open

Note:Jumper JP3 may not be present on all board revisions.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

64KB

(8) 8K x 8

256KB

(8) 32K x 8

Note:TAG is not user configurable.

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP11

64KB

Open

Open

Open

256KB

Closed

Closed

Closed

CPU TYPE CONFIGURATION

Type

JP5

JP6

JP7

80486SX

Open

pins 2 & 3 closed

Open

80486DX

pins 2 & 3 closed

pins 1 & 2 closed

Closed

80486DX2

pins 2 & 3 closed

pins 1 & 2 closed

Closed