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486 EISA BABY SIZE

INFOMATIC POWER SYSTEMS CORPORATION

486 EISA BABY SIZE

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

128MB

Cache

64/128/256/512KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J4

Turbo LED

J7

Power LED & keylock

J5

Reset switch

S9

Turbo switch

J6

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

External BCLK buffering 80486DX (33/50MHz)

JP1

pins 1 & 2 closed

 

External BCLK buffering 80486SX/80487SX (20/25MHz)

JP1

pins 2 & 3 closed

Cache bank select single (128/512KB)

JP2

pins 1 & 2 closed

 

Cache bank select double (64/256KB)

JP2

pins 2 & 3 closed

Snooping/Flush 20MHz CPU

JP8

Closed

 

Snooping/Flush > 20MHz CPU

JP8

Open

Monitor type select color

JP9

Closed

 

Monitor type select monochrome

JP9

Open

CPU clock mode select single frequency

JP12

pins 1 & 2 closed

 

CPU clock mode select double frequency

JP12

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

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

64MB

(4) 16M x 9

NONE

128MB

(4) 16M x 9

(4) 16M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(4) 8K x 8

(4) 8K x 8

128KB

NONE

(4) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

512KB

NONE

(4) 128K x 8

Note:In order to configure cache to 512KB, board needs to be specifically ordered. The difference will be that Bank 1 will be made up of 4 32-pin DIP sockets, instead of 4 28-pin DIP sockets.

CACHE TAG CHIP CONFIGURATION

Size

JP3

JP4

JP5

U55

U56

64KB

Open

Open

Open

(1) 8K x 8

N/A

128KB

Closed

Open

Open

(1) 8K x 8

N/A

256KB

Closed

Closed

Open

(1) 8K x 8

(1) 8K x 8

512KB

Closed

Closed

Closed

(1) 32K x 8

N/A

CACHE DIRTY BIT CHIP CONFIGURATION

Size

JP16

JP17

JP18

U72 & U54

64KB

Open

Open

Open

(2) 16K x 1 or (2) 64K x 1

128KB

Closed

Open

Open

(2) 16K x 1 or (2) 64K x 1

256KB

Closed

Closed

Open

(2) 16K x 1 or (2) 64K x 1

512KB

Closed

Closed

Closed

(2) 64K x 1

CPU TYPE CONFIGURATION

Type

JP10

JP11

80486SX

pins 1 & 2 & 3 & 4 closed

pins 2 & 3 closed

80487SX

pins 1 & 2 & 3 & 4 closed

pins 1 & 2 closed

80486DX

pins 2 & 3 closed

Open

EBC SPEED CONFIGURATION

Speed

JP6

JP7

20MHz

Open

Open

25MHz

Open

Open

33MHz

Open

Closed

40MHz

Closed

Open

50MHz

Closed

Closed