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486IU

FOCUS INFORMATION SYSTEMS, INC.

486IU

Processor

80486SX/80487SX/80486DX

Processor Speed

25/33/40/50MHz

Chip Set

UMC

Max. Onboard DRAM

64MB

Cache

64/128/256/512/1024KB

BIOS

AMI/MR

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J2

Power LED & keylock

J9

Turbo switch

J7

Turbo LED

W14

Speaker

J8

Reset switch

W15

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J1

pins 2 & 3 closed

 

CMOS memory clear

J1

pins 1 & 2 closed

Monitor type select color

W1

Closed

 

Monitor type select monochrome

W1

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

NONE

NONE

5MB

(4) 256K x 9

(4) 1M x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

9MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

NONE

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

CPU JUMPER CONFIGURATION

CPU

W3

W17

W18

W19

80486SX

Open

Open

Open

pins 2 & 3 closed

80487SX

Open

Closed

pins 2 & 3 closed

pins 1 & 2 closed

80486DX

Open

Closed

pins 1 & 2 closed

pins 1 & 2 closed

Note:When a 20MHz 80486SX CPU is used, W3 is closed and a 40MHz clock is installed.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (U25, U34, U35)

TAG (U36)

64KB

(4) 8K x 8

(4) 8K x 8

(3) 16K x 4

NONE

128KB

(4) 32K x 8

NONE

(3) 16K x 4

NONE

256KB

(4) 32K x 8

(4) 32K x 8

(3) 16K x 4

NONE

512KB

(4) 128K x 8

NONE

(3) 64K x 4

(1) 64K x 4

1024KB

(4) 128K x 8

(4) 128K x 8

(3) 64K x 4

(1) 64K x 4

CACHE JUMPER CONFIGURATION

Size

W7

W8

W9

W10

W12

W13

W20

W21

W22

W23

64KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

Closed

1 & 2

2 & 3

Open

Open

128KB

1 & 2

1 & 2

2 & 3

1 & 2

1 & 2

Closed

2 & 3

1 & 2

Open

Open

256KB

1 & 2

2 & 3

2 & 3

1 & 2

1 & 2

Closed

1 & 2

2 & 3

Open

Open

512KB

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

Open

Open

1 & 2

2 & 3

1 & 2

1024KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Open

Open

1 & 2

1 & 2

2 & 3

Note:Pins designated should be in the closed position.