SY-25 J/K/L Motherboard Settings and Configuration

SOYO COMPUTER CO., LTD.

SY-25 J/K/L

Processor
CX486S/80486SX/CX486DX/AM486DX/SL80486DX/AM486DX2/ 80486DX2/AM486DX4/80486DX4/P24D/P24T
Processor Speed
25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Chip Set
Unidentified
Video Chip Set
None
Maximum Onboard Memory
128MB (EDO supported)
Maximum Video Memory
None
Cache
64/128/256KB
BIOS
Award
Dimensions
254mm x 218mm
I/O Options
32-bit VESA local bus slots (3), green PC connector
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Power LED & keylock
J17
Turbo LED
J22
Speaker
J18
Green PC connector
JP4
Reset switch
J19
Green PC connector
JP6
External battery
J20
Green PC connector
JP7
Turbo switch
J21
32-bit VESA local bus slots
SL1 – SL3

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
Monitor type select monochrome
JP3
Open

Monitor type select color/EGA/VGA
JP3
Closed
»
CMOS memory normal operation
JP5
Pins 1 & 2 closed

CMOS memory clear
JP5
Pins 2 & 3 closed
»
Factory configured - do not alter
JP17
Pins 1 & 2 closed
»
Factory configured - do not alter
JP27
Pins 1 & 2 closed
»
Factory configured - do not alter
JP32
Pins 1 & 2 closed
»
Factory configured - do not alter
JP34
Unidentified

SIMM CONFIGURATION 1
Size
Bank 0
Bank 1
Bank 2
1MB
(4) 256K x 9
None
None
2MB
(4) 256K x 9
(1) 256K x 36
None
4MB
(4) 1M x 9
None
None
5MB
(4) 256K x 9
(1) 1M x 36
None
6MB
(4) 256K x 9
(1) 256K x 36
(1) 1M x 36
8MB
(4) 1M x 9
(1) 1M x 36
None
12MB
(4) 1M x 9
(1) 1M x 36
(1) 1M x 36
16MB
(4) 4M x 9
None
None
17MB
(4) 256K x 9
(1) 4M x 36
None
18MB
(4) 256K x 9
(1) 256K x 36
(1) 4M x 36
20MB
(4) 1M x 9
(1) 4M x 36
None
24MB
(4) 1M x 9
(1) 1M x 36
(1) 4M x 36
32MB
(4) 4M x 9
(1) 4M x 36
None
36MB
(4) 1M x 9
(1) 4M x 36
(1) 4M x 36
48MB
(4) 4M x 9
(1) 4M x 36
(1) 4M x 36
64MB
(4) 16M x 9
None
None
65MB
(4) 256K x 9
(1) 16M x 36
None
68MB
(4) 1M x 9
(1) 16M x 36
None
72MB
(4) 1M x 9
(1) 1M x 36
(1) 16M x 36
80MB
(4) 4M x 9
(1) 16M x 36
None
96MB
(4) 4M x 9
(1) 4M x 36
(1) 16M x 36
128MB
(4) 16M x 9
(1) 16M x 36
None

SIMM CONFIGURATION 2
Size
Bank 0
Bank 1
Bank 2
1MB
None
(1) 256K x 36
None
2MB
None
(1) 256K x 36
(1) 256K x 36
2MB
None
(1) 512K x 36
None
4MB
None
(1) 512K x 36
(1) 512K x 36
4MB
None
(1) 1M x 36
None
5MB
None
(1) 256K x 36
(1) 1M x 36
6MB
(4) 1M x 9
(1) 256K x 36
(1) 256K x 36
6MB
None
(1) 512K x 36
(1) 1M x 36
8MB
None
(1) 1M x 36
(1) 1M x 36
8MB
None
(1) 2M x 36
None
12MB
(4) 1M x 9
(1) 1M x 36
(1) 1M x 36
12MB
None
(1) 1M x 36
(1) 2M x 36
16MB
None
(1) 2M x 36
(1) 2M x 36
16MB
None
(1) 4M x 36
None
17MB
None
(1) 256K x 36
(1) 4M x 36
18MB
(4) 4M x 9
(1) 256K x 36
(1) 256K x 36
18MB
None
(1) 512K x 36
(1) 4M x 36
20MB
None
(1) 1M x 36
(1) 4M x 36
24MB
(4) 4M x 9
(1) 1M x 36
(1) 1M x 36
32MB
None
(1) 4M x 36
(1) 4M x 36
32MB
None
(1) 8M x 36
None
36MB
(4) 4M x 9
(1) 1M x 36
(1) 4M x 36
36MB
None
(1) 1M x 36
(1) 8M x 36
48MB
(4) 4M x 9
(1) 4M x 36
(1) 4M x 36
48MB
None
(1) 4M x 36
(1) 8M x 36
64MB
None
(1) 8M x 36
(1) 8M x 36
65MB
None
(1) 256K x 36
(1) 16M x 36
68MB
None
(1) 1M x 36
(1) 16M x 36
72MB
(4) 16M x 9
(1) 1M x 36
(1) 1M x 36
80MB
None
(1) 4M x 36
(1) 16M x 36
96MB
(4) 16M x 9
(1) 4M x 36
(1) 4M x 36
128MB
None
(1) 16M x 36
(1) 16M x 36
Note: Board also accepts x 32 SIMMs.

SIMM JUMPER CONFIGURATION
Configuration
JP35
JP36
JP37
1
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
2
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
64KB
(4) 8K x 8
(4) 8K x 8
(1) 8K x 8
128KB
(4) 32K x 8
None
(1) 8K x 8
256KB (A)
(4) 32K x 8
(4) 32K x 8
(1) 16K/32K x 8
256KB (B)
(4) 64K x 8
None
(1) 16K/32K x 8

CACHE JUMPER CONFIGURATION
Size
JP9
JP10
JP13
64KB
Pins 2 & 3 closed
Open
Pins 1 & 2 closed
128KB
Pins 2 & 3 closed
Pins 1 & 2 closed
Pins 2 & 3 closed
256KB (A)
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
256KB (B)
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed

CPU SPEED SELECTION
Speed
JP29
JP30
JP31
25MHz
Closed
Open
Closed
33MHz
Open
Closed
Closed
40MHz
Closed
Open
Open
50iMHz
Closed
Open
Closed
50MHz
Open
Closed
Open
66iMHz
Open
Closed
Closed
75iMHz
Closed
Open
Closed
80iMHz
Closed
Open
Open
100iMHz
Open
Closed
Closed

CPU TYPE SELECTION
Type
JP1
JP2
JP11
JP12
JP14
CX 486S
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
80486SX
2 & 3
1 & 2
3 & 4
2 & 3
2 & 3
CX 486DX
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
AM486DX
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
SL80486DX
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
AM486DX2
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
80486DX2
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
AM486DX4
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
80486DX4
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
80486DX4 (ODP)
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
P24D
1 & 2
1 & 2
1 & 2, 3 & 4
2 & 3
1 & 2, 3 & 4
P24T
2 & 3
1 & 2
3 & 4
2 & 3
3 & 4
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON’T)
Type
JP15
JP16
JP18
JP19
CX 486S
2 & 3
Open
2 & 3
2 & 3
80486SX
Open
Open
2 & 3
4 & 5
CX 486DX
2 & 3
Open
2 & 3
2 & 3
AM486DX
2 & 3
Open
2 & 3
4 & 5
SL80486DX
2 & 3
Open
2 & 3
4 & 5
AM486DX2
2 & 3
Open
2 & 3
4 & 5
80486DX2
2 & 3
Open
2 & 3
4 & 5
AM486DX4
2 & 3
Open
2 & 3
4 & 5
80486DX4
2 & 3
Open
2 & 3
4 & 5
80486DX4 (ODP)
2 & 3
Open
2 & 3
4 & 5
P24D
2 & 3
Closed
1 & 2
4 & 5
P24T
1 & 2
Open
2 & 3
1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON’T)
Type
JP20
JP21
JP22
JP23
CX 486S
Open
Open
2 & 3
2 & 3
80486SX
Open
1 & 2
Open
Open
CX 486DX
Open
Open
2 & 3
2 & 3
AM486DX
Open
1 & 2
Open
Open
SL80486DX
Open
1 & 2
Open
Open
AM486DX2
2 & 3
1 & 2
Open
Open
80486DX2
Open
1 & 2
Open
Open
AM486DX4
1 & 2
1 & 2
Open
Open
80486DX4
Open
1 & 2
Open
Open
80486DX4 (ODP)
Open
1 & 2
Open
Open
P24D
1 & 2
2 & 3
1 & 2
Open
P24T
Open
Open
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION
Voltage
JP24
3.45v
Pins 3 & 5, 4 & 6 closed
5v
Pins 1 & 3, 2 & 4 closed

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SY-25 J/K/L Motherboard Settings and Configuration

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Processor	CX486S/80486SX/CX486DX/AM486DX/SL80486DX/AM486DX2/ 80486DX2/AM486DX4/80486DX4/P24D/P24T
Processor Speed	25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	128MB (EDO supported)
Maximum Video Memory	None
Cache	64/128/256KB
BIOS	Award
Dimensions	254mm x 218mm
I/O Options	32-bit VESA local bus slots (3), green PC connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J17	Turbo LED	J22
Speaker	J18	Green PC connector	JP4
Reset switch	J19	Green PC connector	JP6
External battery	J20	Green PC connector	JP7
Turbo switch	J21	32-bit VESA local bus slots	SL1 – SL3

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Monitor type select monochrome	JP3	Open
	Monitor type select color/EGA/VGA	JP3	Closed
»	CMOS memory normal operation	JP5	Pins 1 & 2 closed
	CMOS memory clear	JP5	Pins 2 & 3 closed
»	Factory configured - do not alter	JP17	Pins 1 & 2 closed
»	Factory configured - do not alter	JP27	Pins 1 & 2 closed
»	Factory configured - do not alter	JP32	Pins 1 & 2 closed
»	Factory configured - do not alter	JP34	Unidentified

SIMM CONFIGURATION 1
Size	Bank 0	Bank 1	Bank 2
1MB	(4) 256K x 9	None	None
2MB	(4) 256K x 9	(1) 256K x 36	None
4MB	(4) 1M x 9	None	None
5MB	(4) 256K x 9	(1) 1M x 36	None
6MB	(4) 256K x 9	(1) 256K x 36	(1) 1M x 36
8MB	(4) 1M x 9	(1) 1M x 36	None
12MB	(4) 1M x 9	(1) 1M x 36	(1) 1M x 36
16MB	(4) 4M x 9	None	None
17MB	(4) 256K x 9	(1) 4M x 36	None
18MB	(4) 256K x 9	(1) 256K x 36	(1) 4M x 36
20MB	(4) 1M x 9	(1) 4M x 36	None
24MB	(4) 1M x 9	(1) 1M x 36	(1) 4M x 36
32MB	(4) 4M x 9	(1) 4M x 36	None
36MB	(4) 1M x 9	(1) 4M x 36	(1) 4M x 36
48MB	(4) 4M x 9	(1) 4M x 36	(1) 4M x 36
64MB	(4) 16M x 9	None	None
65MB	(4) 256K x 9	(1) 16M x 36	None
68MB	(4) 1M x 9	(1) 16M x 36	None
72MB	(4) 1M x 9	(1) 1M x 36	(1) 16M x 36
80MB	(4) 4M x 9	(1) 16M x 36	None
96MB	(4) 4M x 9	(1) 4M x 36	(1) 16M x 36
128MB	(4) 16M x 9	(1) 16M x 36	None

SIMM CONFIGURATION 2
Size	Bank 0	Bank 1	Bank 2
1MB	None	(1) 256K x 36	None
2MB	None	(1) 256K x 36	(1) 256K x 36
2MB	None	(1) 512K x 36	None
4MB	None	(1) 512K x 36	(1) 512K x 36
4MB	None	(1) 1M x 36	None
5MB	None	(1) 256K x 36	(1) 1M x 36
6MB	(4) 1M x 9	(1) 256K x 36	(1) 256K x 36
6MB	None	(1) 512K x 36	(1) 1M x 36
8MB	None	(1) 1M x 36	(1) 1M x 36
8MB	None	(1) 2M x 36	None
12MB	(4) 1M x 9	(1) 1M x 36	(1) 1M x 36
12MB	None	(1) 1M x 36	(1) 2M x 36
16MB	None	(1) 2M x 36	(1) 2M x 36
16MB	None	(1) 4M x 36	None
17MB	None	(1) 256K x 36	(1) 4M x 36
18MB	(4) 4M x 9	(1) 256K x 36	(1) 256K x 36
18MB	None	(1) 512K x 36	(1) 4M x 36
20MB	None	(1) 1M x 36	(1) 4M x 36
24MB	(4) 4M x 9	(1) 1M x 36	(1) 1M x 36
32MB	None	(1) 4M x 36	(1) 4M x 36
32MB	None	(1) 8M x 36	None
36MB	(4) 4M x 9	(1) 1M x 36	(1) 4M x 36
36MB	None	(1) 1M x 36	(1) 8M x 36
48MB	(4) 4M x 9	(1) 4M x 36	(1) 4M x 36
48MB	None	(1) 4M x 36	(1) 8M x 36
64MB	None	(1) 8M x 36	(1) 8M x 36
65MB	None	(1) 256K x 36	(1) 16M x 36
68MB	None	(1) 1M x 36	(1) 16M x 36
72MB	(4) 16M x 9	(1) 1M x 36	(1) 1M x 36
80MB	None	(1) 4M x 36	(1) 16M x 36
96MB	(4) 16M x 9	(1) 4M x 36	(1) 4M x 36
128MB	None	(1) 16M x 36	(1) 16M x 36
Note: Board also accepts x 32 SIMMs.

SIMM JUMPER CONFIGURATION
Configuration	JP35	JP36	JP37
1	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
2	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8
128KB	(4) 32K x 8	None	(1) 8K x 8
256KB (A)	(4) 32K x 8	(4) 32K x 8	(1) 16K/32K x 8
256KB (B)	(4) 64K x 8	None	(1) 16K/32K x 8

CACHE JUMPER CONFIGURATION
Size	JP9	JP10	JP13
64KB	Pins 2 & 3 closed	Open	Pins 1 & 2 closed
128KB	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
256KB (A)	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
256KB (B)	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed

CPU SPEED SELECTION
Speed	JP29	JP30	JP31
25MHz	Closed	Open	Closed
33MHz	Open	Closed	Closed
40MHz	Closed	Open	Open
50iMHz	Closed	Open	Closed
50MHz	Open	Closed	Open
66iMHz	Open	Closed	Closed
75iMHz	Closed	Open	Closed
80iMHz	Closed	Open	Open
100iMHz	Open	Closed	Closed

CPU TYPE SELECTION
Type	JP1	JP2	JP11	JP12	JP14
CX 486S	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2
80486SX	2 & 3	1 & 2	3 & 4	2 & 3	2 & 3
CX 486DX	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2
AM486DX	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
SL80486DX	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
AM486DX2	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
80486DX2	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
AM486DX4	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
80486DX4	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
80486DX4 (ODP)	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
P24D	1 & 2	1 & 2	1 & 2, 3 & 4	2 & 3	1 & 2, 3 & 4
P24T	2 & 3	1 & 2	3 & 4	2 & 3	3 & 4
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON’T)
Type	JP15	JP16	JP18	JP19
CX 486S	2 & 3	Open	2 & 3	2 & 3
80486SX	Open	Open	2 & 3	4 & 5
CX 486DX	2 & 3	Open	2 & 3	2 & 3
AM486DX	2 & 3	Open	2 & 3	4 & 5
SL80486DX	2 & 3	Open	2 & 3	4 & 5
AM486DX2	2 & 3	Open	2 & 3	4 & 5
80486DX2	2 & 3	Open	2 & 3	4 & 5
AM486DX4	2 & 3	Open	2 & 3	4 & 5
80486DX4	2 & 3	Open	2 & 3	4 & 5
80486DX4 (ODP)	2 & 3	Open	2 & 3	4 & 5
P24D	2 & 3	Closed	1 & 2	4 & 5
P24T	1 & 2	Open	2 & 3	1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON’T)
Type	JP20	JP21	JP22	JP23
CX 486S	Open	Open	2 & 3	2 & 3
80486SX	Open	1 & 2	Open	Open
CX 486DX	Open	Open	2 & 3	2 & 3
AM486DX	Open	1 & 2	Open	Open
SL80486DX	Open	1 & 2	Open	Open
AM486DX2	2 & 3	1 & 2	Open	Open
80486DX2	Open	1 & 2	Open	Open
AM486DX4	1 & 2	1 & 2	Open	Open
80486DX4	Open	1 & 2	Open	Open
80486DX4 (ODP)	Open	1 & 2	Open	Open
P24D	1 & 2	2 & 3	1 & 2	Open
P24T	Open	Open	1 & 2	1 & 2
Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION
Voltage	JP24
3.45v	Pins 3 & 5, 4 & 6 closed
5v	Pins 1 & 3, 2 & 4 closed