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INFORMTECH INTERNATIONAL, INC.

IT486SL-50MHz Ver. 2.0

Processor

80486SX/80487SX/80486DX

Processor Speed

20/25/33/50MHz

Chip Set

OPTI

Max. Onboard DRAM

40MB

SRAM Cache

64/256KB

BIOS

OPTI

Dimensions

218mm x 330mm

I/O Options

Auxiliary keyboard connector

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

Auxiliary keyboard

J22

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP2

open

 

Monitor type select color

JP2

closed

»

Factory configured - do not alter

JP6

open

»

External battery type select lithium 3.6VDC

JP14

pins 1 & 3 closed

 

External battery type select alkaline 4.5VDC

JP14

pins 1 & 2 closed

 

External battery type select four pack AA 6VDC

JP14

pins 3 & 4 closed

»

Factory configured - do not alter

JP15

open

 

I/O bus select zero wait states

JP16

JP17

closed

closed

 

I/O bus select one wait state

JP16

JP17

closed

open

 

I/O bus select two wait states

JP16

JP17

open

closed

 

I/O bus select three wait states

JP16

JP17

open

open

»

Factory configured - do not alter

JP18

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

4MB

(4) 1M x 9

NONE

NONE

NONE

5MB

(4) 256K x 9

(4) 1M x 9

NONE

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

12MB

(4) 1M x 9

(4) 1M x 9

(1) 4M x 36

NONE

16MB

(4) 4M x 9

NONE

NONE

NONE

16MB

(4) 1M x 9

(4) 1M x 9

(1) 4M x 36

(1) 4M x 36

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 4M x 9

(1) 4M x 36

NONE

28MB

(4) 1M x 9

(4) 4M x 9

(1) 4M x 36

(1) 4M x 36

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 4M x 9

(4) 4M x 9

(1) 4M x 36

NONE

40MB

(4) 4M x 9

(4) 4M x 9

(1) 4M x 36

(1) 4M x 36

CPU TYPE CONFIGURATION

CPU Type

JP3

JP4

JP5

80486DX

pins 2 & 3 closed

closed

pins 1 & 2 closed

80487SX

pins 1 & 2 closed

closed

pins 1 & 2 closed

80486SX

open

open

pins 2 & 3 closed

SRAM JUMPER CONFIGURATION

Size

JP9

JP10

JP12

64KB

open

open

open

256KB

closed

closed

closed

SRAM CONFIGURATION

Size

Bank 0

TAG

Dirty Bit (U64)

64KB

(8) 8K x 8

(2) 16K x 4

(1) 64K x 1

256KB

(8) 32K x 8

(2) 16K x 4

(1) 64K x 1

CPU SPEED CONFIGURATION

CPU Speed

JP7

JP13

50MHz

pins 1 & 2 closed

pins 2 & 3 closed

33MHz

pins 2 & 3 closed

pins 1 & 2 closed

25MHz

pins 2 & 3 closed

pins 2 & 3 closed