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CH-491E

CHICONY, INC.

CH-491E

Processor

CX486S/80486SDX/CX487S/80487SX/CX486DX/AM486DX/80486DX/ CX486DX2/AM486DX2/80486DX2/Pentium Overdrive

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

Advanced

Max. Onboard DRAM

64MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

220mm x 250mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J3

Speaker

J7

Reset switch

J4

Power LED & keylock

J8

Turbo switch

J5

32-bit VESA local bus slots

SL1 - SL3

Turbo LED

J6

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

JP1

Open

 

CMOS memory clear

JP1

Closed

 

Address strobe delay disabled

JP7

pins 1 & 2 closed

 

Address strobe delay enabled

JP7

pins 2 & 3 closed

PQFP CPU enabled

JP12

Open

 

PQFP CPU disabled

JP12

Closed

VGA card select normal card installed

JP19

pins 1 & 2 closed

 

VGA card select Weitek Power 9000 card installed

JP19

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

1MB

NONE

(4) 256K x 9

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

4MB

NONE

(4) 1M x 9

5MB

(4) 1M x 9

(4) 256K x 9

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

16MB

NONE

(4) 4M x 9

17MB

(4) 4M x 9

(4) 256K x 9

17MB

(4) 256K x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

32KB

(4) 8K x 8

NONE

(1) 8K x 8

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) 16K x 8 or (1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP4

JP5

JP6

32KB

2 & 3

2 & 3

Open

Open

Open

64KB

1 & 2

1 & 2

Open

Open

Closed

128KB

2 & 3

2 & 3

Open

Closed

Closed

256KB

1 & 2

1 & 2

Closed

Closed

Closed

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP15

JP16

JP17

JP18

JP20

CX486S

2 & 3

Open

Open

2 & 3

2 & 3

80486SX

2 & 3

Open

Open

2 & 3

2 & 3

CX487S

1 & 2, 3 & 4

1 & 2

Open

1 & 2

1 & 2

80487SX

1 & 2, 3 & 4

2 & 3

Open

2 & 3

2 & 3

CX486DX

1 & 2, 3 & 4

1 & 2

Open

2 & 3

2 & 3

AM80486DX

1 & 2, 3 & 4

1 & 2

Open

2 & 3

2 & 3

80486DX

1 & 2, 3 & 4

1 & 2

Open

2 & 3

2 & 3

CX486DX2

1 & 2, 3 & 4

1 & 2

Closed

2 & 3

2 & 3

AM486DX2

1 & 2, 3 & 4

1 & 2

Open

2 & 3

2 & 3

80486DX2

1 & 2, 3 & 4

1 & 2

Open

2 & 3

2 & 3

P24T

1 & 2, 3 & 4

1 & 2

Open

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JP8

JP9

JP10

JP11

20Mhz

Closed

Closed

Closed

Closed

25MHz

Open

Open

Closed

Closed

33MHz

Open

Open

Closed

Open

40MHz

Open

Open

Open

Closed

50iMHz

Open

Open

Closed

Closed

50MHz

Open

Open

Open

Open

66iMHz

Open

Open

Closed

Open

VL BUS WAIT STATE CONFIGURATION

Wait states

JP13

0 wait states

Open

1 wait state

Closed

VL BUS SPEED CONFIGURATION

CPU speed

JP14

<= 33MHz

Open

> 33MHz

Closed