CH-491E Motherboard Settings and Configuration

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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CH-491E Motherboard Settings and Configuration

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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