INFORMTECH INTERNATIONAL, INC.

IT486EX VER. 1

Processor

80486SX/80486DX

Processor Speed

25/33MHz

Chip Set

Intel

Max. Onboard DRAM

64MB

Cache

64/128KB (with external cache card)

BIOS

Phoenix

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo switch

P1

Reset switch

P4

Turbo LED

P2

Power LED & keylock

P5

Speaker

P3

External battery

P20

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Cache write protect disabled

J5

Closed

 

Cache write protect enabled

J5

Open

»

On board DRAM access enabled

J8

Closed

 

On board DRAM access disabled

J8

Open

»

I/O recovery time select 8-bit = 11BLCK, 16-bit = 3BLCK

J16

Closed

 

No recovery time

J16

Open

»

80486 internal cache enabled

J17

Closed

 

80486 internal cache disabled

J17

Open

»

Turbocache486 enabled

J20

Closed

 

Turbocache486 disabled

J20

Open

»

BIOS duplicated (to 00FF0000 hex)

J36

Closed

 

BIOS not duplicated

J36

Open

»

Turbo mode enabled

P1

Open

 

Turbo mode disabled

P1

Closed

»

Factory configured - do not alter

SW1/7

Off

»

Monitor type select monochrome

SW1/8

Off

 

Monitor type select color

SW1/8

On

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

10MB

(4) 1M x 9

(4) 1M x 9

(4) 256K x 9

(4) 256K x 9

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

34MB

(4) 4M x 9

(4) 4M x 9

(4) 256K x 9

(4) 256K x 9

34MB

(4) 256K x 9

(4) 256K x 9

(4) 4M x 9

(4) 4M x 9

40MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

MEMORY BANK CONFIGURATION (BANK 0 & 1)

SIMM Type

SW1/1

SW1/2

No memory installed

Off

Off

256KB

On

Off

1MB

Off

On

4MB

On

On

MEMORY BANK CONFIGURATION (BANK 2 & 3)

SIMM Type

SW1/3

SW1/4

No memory installed

Off

Off

256KB

On

Off

1MB

Off

On

4MB

On

On

MEMORY SPEED/CPU MHZ CONFIGURATION (25MHZ)

SIMM Type

SW1/5

SW1/6

256KB

Off

Off

1MB

On

On

4MB

On

On

Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2 & 3.

MEMORY SPEED/CPU MHZ CONFIGURATION (33MHZ)

SIMM Type

SW1/5

SW1/6

256KB

Off

Off

1MB

On

On

4MB

Off

Off

Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2 & 3.

TURBOCACHE486 CONFIGURATION

Module

J17

J18

J19

82485ES

Open

Open

Open

82485MA/MB

Closed

Closed

Closed

TURBOCACHE486 JUMPER CONFIGURATION

Module

J1

J2

J29

J63

82485ES

Open

Open

Open

Open

82485MA/MB

Closed

Closed

Closed

Closed

CPU SPEED CONFIGURATION

Speed

J3

J15

25MHz

pins 2 & 3 closed

Closed

33MHz

pins 1 & 2 closed

Open

BATTERY TYPE CONFIGURATION

Battery type

J64

4.5V (without internal current limiting resistor)

pins 3 & 4 closed

3.6V-4.5V (with internal current limiting resistor)

pins 1 & 3 closed

6V (without internal current limiting resistor)

pins 2 & 4 closed

6V (with internal current limiting resistor)

pins 1 & 2 closed

BIOS CONTROL CONFIGURATION

ROM type

J25

J35

28F512

Closed

Closed

28F010

Closed

Open

27C512

Open

Closed

27C010

Open

Open