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IH4077D

MITAC INTERNATIONAL CORPORATION

IH4077D

Processor

80486SX/CXM7/80486DX/80486DX2/80486DX4/P23N/P24D/Pentium Overdrive

Processor Speed

25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz

Chip Set

EFAR

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

Award

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

IDE interface

CN1

Turbo switch

JP45

Floppy drive interface

CN2

Reset switch

JP46

Serial port 2

J9

Power LED & keylock

JP49

Serial port 1

J10

Speaker

JP50

Parallel port

J11

IDE interface LED

JP51

External battery

JP7

D/D board connector

JP200

Turbo LED

JP21

32-bit VESA local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

JP1

N/A

»

Factory configured - do not alter

JP2

N/A

»

Factory configured - do not alter

JP3

N/A

»

CMOS memory normal operation

JP4

pins 2 & 3 closed

 

CMOS memory clear

JP4

pins 1 & 2 closed

»

Factory configured - do not alter

JP5

N/A

»

Factory configured - do not alter

JP6

N/A

»

Parallel port IRQ select IRQ7

JP13

pins 2 & 3 closed

 

Parallel port IRQ select IRQ5

JP13

pins 1 & 2 closed

»

Factory configured - do not alter

JP14

N/A

»

Factory configured - do not alter

JP15

N/A

»

Factory configured - do not alter

JP17

N/A

»

Factory configured - do not alter

JP23

N/A

»

Factory configured - do not alter

JP33

N/A

»

Factory configured - do not alter

JP48

N/A

»

BIOS type select normal

JP130

pins 1 & 2 closed

 

BIOS type select flash

JP130

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

2MB

(1) 512K x 36

NONE

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 512K x 36

NONE

(1) 512K x 36

NONE

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 256K x 36

(1) 1M x 36

NONE

NONE

6MB

(1) 512K x 36

NONE

(1) 1M x 36

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

8MB

(1) 2M x 36

NONE

NONE

NONE

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 2M x 36

NONE

(1) 2M x 36

NONE

16MB

(1) 4M x 36

NONE

NONE

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

32MB

(1) 8M x 36

NONE

NONE

NONE

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 8M x 36

NONE

(1) 8M x 36

NONE

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

Note: The orientation of the banks is unidentified. Bank 0 = U23, 25, 27, & 29. Bank 1 = U24, 26, 28, & 30.

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP10

JP11

JP12

64KB

Open

Open

Open

pins 1 & 2 closed

pins 1 & 2 closed

128KB

Closed

Closed

Open

pins 2 & 3 closed

pins 2 & 3 closed

256KB

Closed

Closed

Closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP16

JP18

JP24

JP27

JP28

JP29

80486SX

Closed

Open

Open

Open

Closed

Open

CX M7

Open

Closed

Closed

Closed

Open

Closed

80486DX

Closed

Open

Open

Open

Closed

Open

80486DX2

Closed

Open

Open

Open

Closed

Open

80486DX4

Closed

Open

Open

Open

Closed

Open

P23N

Closed

Open

Open

Open

Closed

Open

P24D

Open

Closed

Closed

Open

Closed

Open

P24T

Open

Closed

Closed

Open

Closed

Open

CPU TYPE CONFIGURATION (CON’T)

Type

JP34

JP35

JP38

JP39

JP40

JP41

80486SX

Closed

Closed

Closed

Open

Open

2 & 3

CX M7

Open

Open

Open

Closed

2 & 3

1 & 2

80486DX

Closed

Closed

Closed

Closed

2 & 3

1 & 2

80486DX2

Closed

Closed

Closed

Closed

2 & 3

1 & 2

80486DX4

Closed

Closed

Closed

Closed

2 & 3

1 & 2

P23N

Closed

Closed

Closed

Closed

1 & 2

1 & 2

P24D

Open

Open

Open

Closed

2 & 3

1 & 2

P24T

Open

Open

Open

Closed

1 & 2

1 & 2

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CON’T)

Type

JP42

JP43

JP44

JP47

JP110

80486SX

2 & 3

2 & 3

2 & 3

Open

Open

CX M7

1 & 2

1 & 2

1 & 2

Closed

Closed

80486DX

2 & 3

2 & 3

2 & 3

Open

Open

80486DX2

2 & 3

2 & 3

2 & 3

Open

Open

80486DX4

2 & 3

2 & 3

2 & 3

Open

Open

P23N

2 & 3

2 & 3

2 & 3

Open

Open

P24D

2 & 3

2 & 3

2 & 3

Closed

Open

P24T

2 & 3

2 & 3

2 & 3

Open

Open

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CX M7 ONLY)

Type

JP25

CX486DX

Open

CX486DX2

Closed

CPU SPEED CONFIGURATION

Speed

JP30

JP31

JP32

25MHz

Closed

Open

Open

33MHz

Closed

Closed

Closed

40MHZ

Closed

Closed

Open

50iMHz

Closed

Open

Open

50MHz

Open

Open

Closed

66iMHz

Closed

Closed

Closed

75iMHz

Closed

Open

Open

100iMHz

Closed

Closed

Closed

CPU SPEED CONFIGURATION (80486DX4 ONLY)

Speed

JP22

JP26

1x

N/A

Open

2x

Closed

N/A

2.5x

N/A

N/A

3x

Open

Closed

VESA WAIT STATE CONFIGURATION

Wait states

JP37

0 wait states

pins 1 & 2 closed

1 wait state

pins 2 & 3 closed

BUS SPEED CONFIGURATION

CPU speed

JP36

<= 33MHz

pins 1 & 2 closed

> 33MHz

pins 2 & 3 closed