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486EI VESA/EISA (VER. 1.0)

UNIDENTIFIED

486EI VESA/EISA (VER. 1.0)

Processor

80486SX/80487SX/80486DX/80486DX2/P23/P24T

Processor Speed

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

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

256MB

Maximum Video Memory

None

Cache

64/128/256/512KB

BIOS

AMI/Phoenix

Dimensions

332mm x 221mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J6

Turbo switch

J22

Speaker

J8

Turbo LED

J24

Power LED & keylock

J9

32-bit VESA local bus slots

SL1 - SL3

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Monitor type select color

J7

Closed

 

Monitor type select monochrome

J7

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

None

None

None

2MB

(1) 256K x 36

(1) 256K x 36

None

None

2MB

(1) 512K x 36

None

None

None

4MB

(1) 256K x 36

(1) 256K x 36

(1) 512K x 36

None

4MB

(1) 512K x 36

None

(1) 512K x 36

None

4MB

(1) 1M x 36

None

None

None

6MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

None

6MB

(1) 512K x 36

None

(1) 1M x 36

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

8MB

(1) 2M x 36

None

None

None

10MB

(1) 256K x 36

(1) 256K x 36

(1) 1M x 36

(1) 1M x 36

10MB

(1) 512K x 36

None

(1) 1M x 36

(1) 1M x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 2M x 36

None

(1) 2M x 36

None

16MB

(1) 4M x 36

None

None

None

18MB

(1) 256K x 36

(1) 256K x 36

(1) 4M x 36

None

18MB

(1) 512K x 36

None

(1) 4M x 36

None

20MB

(1) 1M x 36

(1) 4M x 36

None

None

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

34MB

(1) 512K x 36

None

(1) 4M x 36

(1) 4M x 36

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

None

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 16M x 36

None

None

None

128MB

(1) 16M x 36

(1) 16M x 36

None

None

192MB

(1) 16M x 36

(1) 16M x 36

(1) 16M x 36

None

256MB

(1) 16M x 36

(1) 16M x 36

(1) 16M x 36

(1) 16M x 36

Note: The location of banks 0 & 1 are unidentified.

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

512KB

(4) 128K x 8

None

Note: The location of banks 0 & 1 are unidentified.

CACHE JUMPER CONFIGURATION

Size

JC1

JC2

JC3

JC4

JC5

JC6

JC7

JC9

64KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

128KB

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

1 & 2

2 & 3

1 & 2

256KB

2 & 3

2 & 3

2 & 3

1 & 2

1 & 2

2 & 3

2 & 3

4 & 5

512KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

1 & 2

Note: Pins designated should be in the closed position.

CPU SPEED SELECTION

Speed

JL2

JO1

JO2

JO3

JO4

20MHz

Open

Open

Closed

Closed

Closed

25MHz

Open

Closed

Open

Closed

Closed

33MHz

Open

Closed

Closed

Open

Closed

50iMHz

Open

Closed

Open

Closed

Closed

50MHz

Closed

Open

Open

Open

Open

66iMHz

Open

Closed

Closed

Open

Closed

CPU TYPE SELECTION

Type

J1

J2

J3

80486SX

Open

Open

Pins 2 & 3 closed

80487SX

Closed

Pins 2 & 3 closed

Pins 1 & 2 closed

80486DX

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

80486DX2

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

P23T

Closed

Pins 2 & 3 closed

Pins 1 & 2 closed

P24T

Closed

Pins 2 & 3 closed

Pins 1 & 2 closed