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COA-921 Motherboard Settings and Configuration







CONCORD OFFICE AUTOMATION INDUSTRIAL (HK) LTD.

COA-921

Processor

80486SX/SL80486SX/UMC486DX/AM486DX/80486DX/SL80486DX/ CX486DX2/IBM486DX2/TI486DX2/UMC486DX2/AM486DX2/ 80486DX2/SL80486DX2/CX486DX4/IBM486DX4/AM486DX4/ (SL)AM486DX4/SL80486DX4/CXP24D/P24D/P24T/CX5X86

Processor Speed

25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)/ 120(internal)MHz

Chip Set

UMC

Video Chip Set

None

Maximum Onboard Memory

256MB

Maximum Video Memory

None

Cache

64/128/256/512KB

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Floppy drive interface

CN1

IDE interface LED

J29

Parallel port

CN2

Turbo switch

J30

Serial port

CN3

Reset switch

J31

Serial port

CN4

Turbo LED

J32

IDE interface 2

CN5

Speaker

J33

IDE interface 1

CN6

Power LED & keylock

J34

External battery

J2

32-bit PCI slots

PC1 - PC3

Green PC connector

J10

 

 

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

J1

Unidentified

 

Battery type select external

J2

Closed

 

Battery type select internal

J2

Pins 2 & 3 closed

 

CMOS memory clear

J2

Pins 3 & 4 closed

»

Factory configured - do not alter

J5

Unidentified

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(1) 256K x 36

None

4MB

(1) 1M x 36

None

8MB

(1) 2M x 36

None

8MB

(1) 1M x 36

(1) 1M x 36

12MB

(1) 2M x 36

(1) 1M x 36

16MB

(1) 4M x 36

None

16MB

(1) 2M x 36

(1) 2M x 36

20MB

(1) 4M x 36

(1) 1M x 36

24MB

(1) 4M x 36

(1) 2M x 36

32MB

(1) 8M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

36MB

(1) 8M x 36

(1) 1M x 36

40MB

(1) 8M x 36

(1) 2M x 36

48MB

(1) 8M x 36

(1) 4M x 36

64MB

(1) 16M x 36

None

64MB

(1) 8M x 36

(1) 8M x 36

68MB

(1) 16M x 36

(1) 1M x 36

72MB

(1) 16M x 36

(1) 2M x 36

80MB

(1) 16M x 36

(1) 4M x 36

96MB

(1) 16M x 36

(1) 8M x 36

128MB

(1) 32M x 36

None

128MB

(1) 16M x 36

(1) 16M x 36

DRAM CONFIGURATION (CON'T)

Size

Bank 0

Bank 1

132MB

(1) 32M x 36

(1) 1M x 36

136MB

(1) 32M x 36

(1) 2M x 36

144MB

(1) 32M x 36

(1) 4M x 36

160MB

(1) 32M x 36

(1) 8M x 36

192MB

(1) 32M x 36

(1) 16M x 36

256MB

(1) 64M x 36

None

256MB

(1) 32M x 36

(1) 32M x 36

CACHE CONFIGURATION

Size

Bank 0

TAG

64KB

(4) 16K x 8

Unidentified

128KB

(4) 32K x 8

Unidentified

256KB

(4) 64K x 8

Unidentified

512KB

(4) 128K x 8

Unidentified

CPU SPEED SELECTION

Speed

J28

25MHz

Pins 1 & 2 closed

33MHz

Pins 1 & 2, 3 & 4, 5 & 6 closed

40MHz

Pins 1 & 2, 3 & 4 closed

50iMHz

Pins 1 & 2 closed

50MHz

Pins 5 & 6 closed

66iMHz

Pins 1 & 2, 3 & 4, 5 & 6 closed

75iMHz

Pins 1 & 2 closed

80iMHz

Pins 1 & 2, 3 & 4 closed

100iMHz

Pins 1 & 2, 3 & 4, 5 & 6 closed

120iMHz

Pins 1 & 2, 3 & 4 closed

CPU TYPE SELECTION

Type

J6

J7

J12

J13

J14

J15

80486SX

1 & 2

1 & 2

Open

2 & 3

Open

Open

SL80486SX

1 & 2

1 & 2

2 & 3, 4 & 5

2 & 3

Open

Open

UMC486DX

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

AM486DX

1 & 2

2 & 3

Open

1 & 2, 3 & 4

Open

3 & 4

80486DX

1 & 2

1 & 2

Open

1 & 2, 3 & 4

Open

3 & 4

SL80486DX

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

CX486DX2

2 & 3

1 & 2

1 & 2, 3 & 4

1 & 2, 3 & 4

2 & 3

3 & 4

IBM486DX2

2 & 3

1 & 2

1 & 2, 3 & 4

1 & 2, 3 & 4

2 & 3

3 & 4

TI486DX2

2 & 3

1 & 2

1 & 2, 3 & 4

1 & 2, 3 & 4

2 & 3

3 & 4

UMC486DX2

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

AM486DX2

1 & 2

2 & 3

Open

1 & 2, 3 & 4

Open

3 & 4

80486DX2

1 & 2

1 & 2

Open

1 & 2, 3 & 4

Open

3 & 4

SL80486DX2

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

CX486DX4

2 & 3

1 & 2

1 & 2, 3 & 4

1 & 2, 3 & 4

2 & 3

3 & 4

IBM486DX4

2 & 3

1 & 2

1 & 2, 3 & 4

1 & 2, 3 & 4

2 & 3

3 & 4

AM486DX4

1 & 2

2 & 3

Open

1 & 2, 3 & 4

Open

3 & 4

(SL)AM486DX4

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

SL80486DX4

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

CXP24D

2 & 3

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

P24D

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

Open

3 & 4

P24T

1 & 2

1 & 2

2 & 3, 4 & 5

1 & 2, 3 & 4

1 & 2

2 & 3

CS5X86

1 & 2

1 & 2

1 & 2, 3 & 4

2 & 3, 4 & 5

Open

3 & 4

Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON'T)

Type

J16

J17

J18

J19

80486SX

1 & 2

Open

Open

Open

SL80486SX

3 & 4

Open

Open

Open

UMC486DX

3 & 4

Open

Open

Open

AM486DX

1 & 2

Open

Open

Open

80486DX

1 & 2

Open

Open

Open

SL80486DX

3 & 4

Open

Open

Open

CX486DX2

3 & 4

2 & 3

1 & 2

2 & 3

IBM486DX2

3 & 4

2 & 3

1 & 2

2 & 3

TI486DX2

3 & 4

2 & 3

1 & 2

2 & 3

UMC486DX2

3 & 4

Open

Open

Open

AM486DX2

1 & 2

Open

Open

Open

80486DX2

1 & 2

Open

Open

Open

SL80486DX2

3 & 4

Open

Open

Open

CX486DX4

3 & 4

2 & 3

1 & 2

Open

IBM486DX4

3 & 4

2 & 3

1 & 2

Open

AM486DX4

1 & 2

Open

Open

Open

(SL)AM486DX4

3 & 4

Open

Open

Open

SL80486DX4

3 & 4

Open

Open

Open

CXP24D

3 & 4

Open

Open

Open

P24D

3 & 4

Open

Open

Open

P24T

3 & 4, 5 & 6

1 & 2

2 & 3

Open

CS5X86

3 & 4

Open

Open

Open

Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON'T)

Type

J20

J21

J22

J23

J24

80486SX

Open

Open

Open

Open

Open

SL80486SX

1 & 2

Open

Open

1 & 2

Open

UMC486DX

1 & 2

2 & 3

Open

1 & 2

Open

AM486DX

Open

Open

Open

Open

Open

80486DX

Open

Open

Open

Open

Open

SL80486DX

1 & 2

2 & 3

Open

1 & 2

Open

CX486DX2

2 & 3

Open

Open

1 & 2

Open

IBM486DX2

2 & 3

Open

Open

1 & 2

Open

TI486DX2

2 & 3

Open

Open

1 & 2

Open

UMC486DX2

1 & 2

2 & 3

Open

1 & 2

Open

AM486DX2

Open

Open

Open

Open

Open

80486DX2

Open

Open

Open

Open

Open

SL80486DX2

1 & 2

2 & 3

Open

1 & 2

Open

CX486DX4

2 & 3

Open

Open

1 & 2

Open

IBM486DX4

2 & 3

Open

Open

1 & 2

Open

AM486DX4

Open

Open

Open

Open

Open

(SL)AM486DX4

1 & 2

Open

2 & 3

1 & 2

Closed

SL80486DX4

1 & 2

Open

Open

1 & 2

Open

CXP24D

1 & 2

Open

2 & 3

1 & 2

Closed

P24D

1 & 2

2 & 3

2 & 3

1 & 2

Closed

P24T

1 & 2

2 & 3

Open

1 & 2

Open

CS5X86

1 & 2

Open

2 & 3

1 & 2

Closed

Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON'T)

Type

J25

J26

J27

J36

80486SX

Open

Open

Open

Closed

SL80486SX

Open

Open

Open

Open

UMC486DX

Open

Open

Open

Open

AM486DX

Open

Open

Open

Closed

80486DX

Open

Open

Open

Closed

SL80486DX

Open

Open

Open

Open

CX486DX2

Open

Open

Open

Open

IBM486DX2

Open

Open

Open

Open

TI486DX2

Open

Open

Open

Open

UMC486DX2

Open

Open

Open

Open

AM486DX2

Open

Open

Open

Closed

80486DX2

Open

Open

Open

Closed

SL80486DX2

Open

Open

Open

Open

CX486DX4

Open

Open

Closed

Open

IBM486DX4

Open

Open

Closed

Open

AM486DX4

Open

Open

Open

Closed

(SL)AM486DX4

Closed

Closed

Open

Open

SL80486DX4

Open

Open

Open

Open

CXP24D

Closed

Closed

Closed

Open

P24D

Closed

Closed

Open

Open

P24T

Open

Open

Open

Open

CS5X86

Closed

Closed

Closed

Open

CPU VOLTAGE SELECTION

Voltage

J8

J9

J11

J35

3.3v

Pins 2 & 3 closed

Pins 2 & 3 closed

Closed

Pins 2 & 3 closed

4v

Pins 2 & 3 closed

Pins 2 & 3 closed

Open

Pins 2 & 3 closed

5v

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

Pins 1 & 2 closed

DMA CHANNEL SELECTION

Channel

J3

J4

1

Pins 1 & 2 closed

Pins 1 & 2 closed

3

Pins 2 & 3 closed

Pins 2 & 3 closed







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