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80486L-ISA

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