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80486ISA (03-009X-00)

FREE COMPUTER TECHNOLOGY, INC.

80486ISA (03-009X-00)

Device Type

Mainboard

Processor

80486SX/80487SX/80486DX

Processor Speed

25/33MHz

Chip Set

OPTI 486WB

Video Chip Set

None

Maximum Onboard Memory

32MB

Maximum Video Memory

None

Cache

64/256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J11

Turbo LED

JP11

Power LED & keylock

J20

Reset switch

SW1

Speaker

J21

Turbo switch

SW2

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Monitor type select color

JP2

Open

 

Monitor type select monochrome

JP2

Closed

SIMM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

None

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

None

5MB

(4) 1M x 9

(4) 256K x 9

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

TAG

64KB

(8) 8K x 8

(1) 8K x 8

256KB

(8) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP9

JP10

64KB

Open

Open

256KB

Closed

Closed

CPU TYPE SELECTION

Type

JP3

JP4

JP5

80486SX

Open

Open

Pins 2 & 3 closed

80487SX

Pins 1 & 2 closed

Closed

Pins 1 & 2 closed

80486DX

Pins 2 & 3 closed

Closed

Pins 1 & 2 closed