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486U (REV. 1.1C)

ELITEGROUP COMPUTER SYSTEMS, INC.

486U (REV. 1.1C)

Processor

80486SX/80487SX/80486DX

Processor Speed

20/25/33/40/50MHz

Chip Set

UMC

Video Chip Set

None

Maximum Onboard Memory

64MB (32MB on external memory card)

Maximum Video Memory

None

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 220mm

I/O Options

External memory card

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J1

External battery

J7

Speaker

J2

Turbo LED

W1 pins 2 & 3

Turbo switch

J4

Reset switch

W14

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Turbo mode enabled

J4

Pins 1 & 2 closed

 

Turbo mode disabled

J4

Open

Factory configured - do not alter

J5

Pins 1 & 2 closed

Factory configured - do not alter

W2

Open

Factory configured - do not alter

W5

Pins 1 & 2 closed

Factory configured - do not alter

W11

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

Note: Banks 2 & 3 are located on the external memory card.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(4) 8K x 8

(4) 8K x 8

128KB

(4) 32K x 8

None

256KB

(4) 32K x 8

(4) 32K x 8

CACHE JUMPER CONFIGURATION

Size

W6

W8

W9

W12

W13

None

Open

Open

Open

Open

Open

64KB

1 & 2

1 & 2

2 & 3

1 & 2

1 & 2

128KB

1 & 2

2 & 3

2 & 3

2 & 3

1 & 2

256KB

2 & 3

2 & 3

2 & 3

1 & 2

2 & 3

Note: Pins designated should be in the closed position.

CACHE TAG CONFIGURATION

Size

U2

U3

U4

U5

64KB

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

128KB

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

256KB

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

(1) 16K x 4

Note: U4 & U5 must be installed even if no cache is installed.

CACHE TAG JUMPER CONFIGURATION

Size

W7

No cache installed

Closed

Chip installed at U3

Open

Chip not installed at U3

Closed

CPU TYPE SELECTION

Type

J3

W3

W4

W10

W15

80486SX

Open

2 & 3

Open

Open

Open

80487SX

2 & 3

1 & 2

Closed

Closed

Open

80486DX

1 & 2

1 & 2

Closed

Open

Open

Note: Pins designated should be in the closed position.