FREE COMPUTER TECHNOLOGY, INC.

80486L-ISA

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

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

Chip Set

UNI

Max. Onboard DRAM

128MB

SRAM Cache

64/128/256KB

BIOS

AMI/Award

Dimensions

254mm x 218mm

I/O Options

32-bit local bus card slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

32-bit local bus card

CN1

Speaker

H4

Turbo switch

H1

Power LED & keylock

H5

Turbo LED

H2

External battery

JP1

Reset switch

H3

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

JP12

open

 

Monitor type select monochrome

JP12

closed

CPU TYPE CONFIGURATION

U26

U51

J4

J5

J7

J8

80486DX2

80486DX

pins 1 & 2 and 3 & 4

pins 1 & 2

closed

open

80486DX

80486DX

pins 1 & 2 and 3 & 4

pins 1 & 2

closed

open

80487SX

80486DX

pins 1 & 2 and 3 & 4

pins 2 & 3

closed

open

80486SX

80486DX

pins 2 & 3

open

closed

open

NONE

80486DX

pins 1 & 2 and 3 & 4

pins 1 & 2

open

closed

Note:Pins designated should be in the closed position.

U51 is a surface mounted CPU (PQFP) that may or may not have been installed at the factory.

U26 is a socketed CPU (PGA) that has been installed at the factory, or can be installed by the user.

DRAM 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) 256K x 9

(4) 1M 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

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

80MB

(4) 16M x 9

(4) 4M x 9

128MB

(4) 16M x 9

(4) 16M x 9

SRAM JUMPER CONFIGURATION

Size

JP2

JP3

64KB

open

open

128KB

pins 2 & 3 closed

closed

256KB

pins 1 & 2 closed

closed

SRAM CONFIGURATION

Size

Cache SRAM

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8