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USA 486DX Motherboard Settings and Configuration






EVERSOURCE COMPUTERS, INC.

USA 486DX

Processor

80486DX

Processor Speed

33/50MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

256KB

BIOS

AMI

Dimensions

330mm x 220mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J2

Reset switch

J6

Turbo switch

J4

External battery

J7

Turbo LED

J5

Speaker

J100

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

J3

Closed

 

Monitor type select monochrome

J3

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

1MB

NONE

(4) 256K x 9

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

4MB

NONE

(4) 1M x 9

5MB

(4) 256K x 9

(4) 1 M x 9

5MB

(4) 1 M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

16MB

NONE

(4) 4M x 9

17MB

(4) 4M x 9

(4) 256K x 9

17MB

(4) 256K x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 1

128KB

(4) 32K x 8

NONE

(1) 8K x 1

256KB

(4) 32K x 8

(4) 32K x 8

(1) 8K x 1

Note:The exact location of TAG is unidentified.

CACHE JUMPER CONFIGURATION

Size

JMP1

JMP2

JMP3

64KB

pins 1 & 2 closed

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

128KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed








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