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

 

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