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80486VESA

FREE COMPUTER TECHNOLOGY, INC.

80486VESA

Processor

80486SX/80487SX/80486SX2/80486DX

ODP486/80486DX2/Pentium Overdrive

Processor Speed

20/25/33/40/50(internal)/66(internal)MHz

Chip Set

SiS

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP1

Reset switch

JP17

Peripheral power save

JP2 & JP3

Turbo LED

JP18

Speaker

JP15

Turbo switch

JP19

Power LED & keylock

JP16

32-bit VESA Local bus slots

SL1, SL2,SL3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS normal operation

JP21

pins 2 & 3 closed

 

CMOS memory clear

JP21

pins 1 & 2 closed

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

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

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP11

JP12

64KB

Open

Open

128KB

pins 1 & 2 closed

Closed

256KB

pins 2 & 3 closed

Closed

CPU TYPE CONFIGURATION

CPU Type

JP7

JP8

80486SX

pins 2 & 3 closed

Open

80487SX

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

80486SX2

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

80486DX

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

80486DX2

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

ODP486 (168-pin)

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

ODP486 (169-pin)

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

Pentium Overdrive

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

CPU CLOCK CONFIGURATION

CPU Clock

JP4

JP5

JP6

20MHz

Closed

Closed

Open

25MHz

Closed

Open

Closed

33MHz

Open

Closed

Closed

40MHz

Closed

Open

Open

50MHz

Open

Closed

Open

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

JP13

JP14

<= 33MHz

0 wait states

Open

Open

> 33MHz

1 wait state

Closed

Closed

MISCELLANEOUS TECHNICAL NOTE

Note: JP2 & JP3 are used for an optional peripheral card timed power shut-down that is set up in CMOS.