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A-Trend OPTi-895 Deep Green Model 1442G v. 1.2

© Carl C. Verderber 25/07/2002 A-Trend OPTi-895 Deep Green Model 1442G v1.2 layout

SIM MODULES INSTALLATION

The OPTi-895 486 Green motherboard can be expanded from 2MB to 128MB by using 256K, 1M, 4M, 16M types of SIM Modules.

The following table provides various configurations of SIM Modules installed in Memory Bank 0-1.

JP34:1-2(SIM9,10 use single density SIM, please refer to figure 2-1)

Bank 0

30 Pin SIMMS

SIMMS 1-4

Bank 0

72 Pin SIMM

SIMM 9

Bank 1

72 Pin SIMM

SIMM 10

Total Memory

256KBX4

None

1MB

2MB

None

1MB

1MB

2MB

1MBX4

None

None

4MB

None

4MB

None

4MB

256KBX4

None

4MB

5MB

None

1MB

4MB

5MB

1MBX4

None

4MB

8MB

None

4MB

4MB

8MB

4MBX4

None

None

16MB

None

16MB

None

16MB

None

1MB

16MB

17MB

256KBX4

None

16MB

17MB

1MBX4

None

16MB

20MB

None

4MB

16MB

20MB

4MBX4

None

16MB

32MB

None

16MB

16MB

32MB

16MBX4

None

None

64MB

None

64MB

None

64MB

16MBX4

None

64MB

128MB

None

64MB

64MB

128MB

JP34:2-3(SIM 9,10 Use double density SIM, Please refure to figure 2-2)

Bank 0

SIM 1-4

Bank 0,1

72 Pin SIMM

SIM 8

Bank 2,3

72 Pin SIMM

SIM 10

Total Memory

None

2MB

2MB

4MB

None

8MB

None

8MB

None

8MB

8MB

16MB

 

 

 

 

SRAM INSTALLATION

The motherboard can support cashe memory from 64K to 256K bytes. Any of 8KX8 or 32KX8 can be used on the motherboard.

 

Cashe Configuration Size

Cache

Size

TAG

RAM

Data

RAM

JP1

JP2

JP3

JP4

JP30

64K

8Kx8

(U11)

Bank 0,1 8Kx8

(U1-U4) (U7-U10)

3

2

1

3

2

1

2

1

2

1

3

2

1

128K

8Kx8

(U11)

Bank 0

32Kx8

(U1-U4)

3

2

1

3

2

1

2

1

2

1

3

2

1

256K

32Kx8

(U11)

Bank 0,1

32Kx8

(U1-U4)

(U7-U10)

3

2

1

3

2

1

2

1

2

1

3

2

1

NOTE: Bank 0: U1,U2,U3,U4

Bank 1: U7,U8,U9,U10

 

 

 

 

 

 

CPU INSTALLATION

Please notice CPU to be installed on the ZIF socket on correct PIN 1 location (SEE PINOUTS ON DIAGRAM OF MOTHERBOARD!!!)

 

CPU type Selection :

CPU Type

JP21

JP22

JP23

INTEL 486DX/DX2/DX4/P24D

AMD 486SX/SX2

CYRIX M7

3

2

1

3

2

1

3

2

1

INTEL 486SX/SX2

CYRIX M6

3

2

1

3

2

1

3

2

1

P24D

3

2

1

3

2

1

3

2

1

 

CPU SPEED SELECTION

CLOCK RATE

JP9

JP10

JP11

JP31

486DX-25/

DX2-50

2

1

2

1

2

1

3

2

1

486DX-33/

DX2-66

2

1

2

1

2

1

3

2

1

486DX40/

486DX2-80

2

1

2

1

2

1

3

2

1

486DX-50

2

1

2

1

2

1

3

2

1

486DX4-75*

2

1

2

1

2

1

3

2

1

486DX4-100*

2

1

2

1

2

1

3

2

1

NOTE : * JP18:1-2,4-5 Use 5V CPU Normal CPU 486DX2,DX,SX

2-3,5-6 Use 3.3V CPU ( Example: 486DX4 )

* 486DX4 IS P24C

 

OTHER JUMPER SETTINGS

Connector

Description

JP16

P24C Clock Speed Rate

Open: for normal CPU/P24C 3X speed

JP19

Cyrix M6/M7 CPU Jumper

1-2: normal/ other CPU, M6/M7

JP20

Cyrix Clock Speed Rate

Open: For normal/other CPU

  1. : M7/M6 1xClock Speed

2-3 : M7/M6 2xClock Speed

JP24

P24D Jumper

Open : Normal/ Other CPU

Close : For P24D CPU only

JP12, JP13

CPU Green Down Speed

Open, Open ( Green Speed 8MHz/16MHz )

JP14,JP25,JP26,JP33

SMI CPU Jumper

Open, Open : For normal CPU

1-2, Open: For Cyrix Write Back CPU

2-3, Open: For INTEL P24T Write Back

Open, Close: INTEL P24D Write Back

JP15,JP17

Write Back CPU Function Jumper

Open, Open: For Normal CPU

1-2, Open: For Cyrix Write Back CPU

2-3, Open: For INTEL P24T Write Back

Open, Close: INTEL P24D Write Back

   

 

 

 

 

 

 

CONNECTOR

DESCRIPTION

J3

Reset Switch

J5

Turbo LED

J4

Turbo Switch

Closed: Turbo Mode

Opened: Non-Turbo Mode

J2

Speaker

J1

Key Lock Connector

Pin 1: Power LED

Pin 2: Unused

Pin 3: Ground

Pin 4: Key Lock

Pin 5: Ground

JP5

VESA ID3 Wait State

Default: Closed

JP6

VESA ID2 Bus Speed

Default: Closed

J6

External Battery

Pin 1: Battery( + )

Pin 2: Unused

Pin 3: Ground

Pin 4: Ground

JP32

Opened : Discharge Battery

Closed: Charge Battery

JP29

Battery Type

  1. Charge:

1-2 Normal

2-3 Clear CMOS Data

JP27

Monitor Type

Closed: Color Monitor

Opened: Monochrome Monitor

JP28

Green Power Signal

Input Connector