SY-25 Q/R Motherboard Settings and Configuration

SOYO COMPUTER CO., LTD.

SY-25 Q/R

Processor
UMCU5S/AM486SX/80486SX/CX486DX/AM486DX/AM486DXL/ 80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/ SL80486DX2/AM486DX4/SL80486DX4/P24D/P24T
Processor Speed
25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/ 100(internal)MHz
Chip Set
Unidentified
Video Chip Set
None
Maximum Onboard Memory
64MB
Maximum Video Memory
None
Cache
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 switch
J21
Speaker
J18
Turbo LED
J22
Reset switch
J19
Green PC connector
JP25
External battery
J20
32-bit VESA local bus slots
SL1 – SL3

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
CMOS memory normal operation
J20
Pins 2 & 3 closed

CMOS memory clear
J20
Pins 3 & 4 closed

Battery type select external
J20
Closed

SIMM CONFIGURATION
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
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

SIMM CONFIGURATION (CON’T)
Size
Bank 0
Bank 1
Bank 2
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
Note: Board also accepts x 32 SIMMs. Do not use any other combination of SIMM configuration.

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
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
256KB (A)
Pins 2 & 3 closed
Pins 2 & 3 closed
256KB (B)
Pins 1 & 2, 3 & 4 closed
Pins 1 & 2 closed

CPU SPEED SELECTION
Speed
JP4
JP5
JP6
25MHz
Open
Open
Closed
33MHz
Closed
Closed
Closed
40MHz
Open
Closed
Closed
50iMHz
Open
Open
Closed
66iMHz
Closed
Closed
Closed
75iMHz
Open
Open
Closed
80iMHz
Open
Closed
Closed
100iMHz
Closed
Closed
Closed

CPU TYPE SELECTION
Type
JP11
JP12
JP13
JP14
JP15
UMC U5S
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
AM486SX
Open
2 & 3
2 & 3
2 & 3
2 & 3
80486SX
Open
2 & 3
2 & 3
2 & 3
2 & 3
CX486DX (5v)
1 & 2, 3 & 4
1 & 2, 3 & 4, 5 & 6
1 & 2, 3 & 4
2 & 3
2 & 3
AM486DX
Open
2 & 3
1 & 2, 3 & 4
2 & 3
2 & 3
AM486DXL (5v)
2 & 3
2 & 3
1 & 2, 3 & 4
2 & 3
2 & 3
80486DX
Open
2 & 3
1 & 2, 3 & 4
2 & 3
2 & 3
SL80486DX
1 & 2
1 & 2
1 & 2, 3 & 4
2 & 3
2 & 3
CX486DX2 (5v)
1 & 2, 3 & 4
1 & 2, 3 & 4, 5 & 6
1 & 2, 3 & 4
2 & 3
2 & 3
CX486DX2-66 (3.6v)
1 & 2, 3 & 4
1 & 2, 3 & 4, 5 & 6
1 & 2, 3 & 4
1 & 2
1 & 2
CX486DX2-80 (4v)
1 & 2, 3 & 4
1 & 2, 3 & 4, 5 & 6
1 & 2, 3 & 4
1 & 2
1 & 2
AM486DX2
Open
2 & 3
1 & 2, 3 & 4
2 & 3
2 & 3
AM486DX2-80 (3.45v)
Open
2 & 3
1 & 2, 3 & 4
1 & 2
1 & 2
AM486DXL2 (5v)
2 & 3
2 & 3
1 & 2, 3 & 4
2 & 3
2 & 3
80486DX2
Open
2 & 3
1 & 2, 3 & 4
2 & 3
2 & 3
SL80486DX2
1 & 2
1 & 2
1 & 2, 3 & 4
2 & 3
2 & 3
AM486DX4 (3.45v)
Open
2 & 3
1 & 2, 3 & 4
1 & 2
1 & 2
SL80486DX4 (3.45v)
1 & 2
1 & 2
1 & 2, 3 & 4
1 & 2
1 & 2
SL80486DX4 (5v)
1 & 2
1 & 2
1 & 2, 3 & 4
2 & 3
2 & 3
P24D
1 & 2, 4 & 5
1 & 2, 4 & 5
1 & 2, 3 & 4
2 & 3
2 & 3
P24T
1 & 2
1 & 2
1 & 2, 3 & 4
2 & 3
2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON’T)
Type
JP16
JP17
JP18
JP19
UMC U5S
2 & 3
3 & 4
1 & 2
Open
AM486SX
2 & 3
Open
Open
Open
80486SX
2 & 3
Open
Open
Open
CX486DX (5v)
2 & 3
1 & 2
2 & 3, 4 & 5
2 & 3
AM486DX
2 & 3
1 & 2
Open
Open
AM486DXL (5v)
2 & 3
1 & 2, 3 & 4
1 & 2
Open
80486DX
2 & 3
1 & 2
Open
Open
SL80486DX
2 & 3
1 & 2
5 & 6
1 & 2, 3 & 4
CX486DX2 (5v)
2 & 3
1 & 2
2 & 3, 4 & 5
2 & 3
CX486DX2-66 (3.6v)
1 & 2
1 & 2
2 & 3, 4 & 5
2 & 3
CX486DX2-80 (4v)
1 & 2
1 & 2
2 & 3, 4 & 5
2 & 3
AM486DX2
2 & 3
1 & 2
Open
Open
AM486DX2-80 (3.45v)
1 & 2
1 & 2
Open
Open
AM486DXL2 (5v)
2 & 3
1 & 2, 3 & 4
1 & 2
Open
80486DX2
2 & 3
1 & 2
Open
Open
SL80486DX2
2 & 3
1 & 2
5 & 6
1 & 2, 3 & 4
AM486DX4 (3.45v)
1 & 2
1 & 2
Open
Open
SL80486DX4 (3.45v)
1 & 2
1 & 2
5 & 6
1 & 2, 3 & 4
SL80486DX4 (5v)
2 & 3
1 & 2
5 & 6
1 & 2, 3 & 4
P24D
2 & 3
1 & 2
3 & 4, 5 & 6
1 & 2, 3 & 4
P24T
2 & 3
2 & 3
5 & 6
1 & 2, 3 & 4
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION
Type
JP20
JP26
JP27
UMC U5S
Open
Open
Open
AM486SX
Open
Open
Open
80486SX
Open
Open
Open
CX486DX (5v)
Open
Open
Open
AM486DX
Open
Open
Open
AM486DXL (5v)
Open
Open
Open
80486DX
Open
Open
Open
SL80486DX
Open
Open
Open
CX486DX2 (5v)
Open
Open
Open
CX486DX2-66 (3.6v)
Open
Open
Pins 3 & 4closed
CX486DX2-80 (4v)
Open
Open
Pins 5 & 6closed
AM486DX2
Open
Open
Open
AM486DX2-80 (3.45v)
Open
Closed
Pins 1 & 2 closed
AM486DXL2 (5v)
Open
Open
Open
80486DX2
Open
Open
Open
SL80486DX2
Open
Open
Open
AM486DX4 (3.45v)
Open
Open
Pins 1 & 2 closed
SL80486DX4 (3.45v)
Open
Open
Pins 1 & 2 closed
SL80486DX4 (5v)
Open
Open
Open
P24D
Open
Open
Open
P24T
Open
Open
Open
Note: Pins designated should be in the closed position.

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Processor	UMCU5S/AM486SX/80486SX/CX486DX/AM486DX/AM486DXL/ 80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/ SL80486DX2/AM486DX4/SL80486DX4/P24D/P24T
Processor Speed	25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/ 100(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	64MB
Maximum Video Memory	None
Cache	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 switch	J21
Speaker	J18	Turbo LED	J22
Reset switch	J19	Green PC connector	JP25
External battery	J20	32-bit VESA local bus slots	SL1 – SL3

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	CMOS memory normal operation	J20	Pins 2 & 3 closed
	CMOS memory clear	J20	Pins 3 & 4 closed
	Battery type select external	J20	Closed

SIMM CONFIGURATION
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
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

SIMM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2
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
Note: Board also accepts x 32 SIMMs. Do not use any other combination of SIMM configuration.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
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
256KB (A)	Pins 2 & 3 closed	Pins 2 & 3 closed
256KB (B)	Pins 1 & 2, 3 & 4 closed	Pins 1 & 2 closed

CPU SPEED SELECTION
Speed	JP4	JP5	JP6
25MHz	Open	Open	Closed
33MHz	Closed	Closed	Closed
40MHz	Open	Closed	Closed
50iMHz	Open	Open	Closed
66iMHz	Closed	Closed	Closed
75iMHz	Open	Open	Closed
80iMHz	Open	Closed	Closed
100iMHz	Closed	Closed	Closed

CPU TYPE SELECTION
Type	JP11	JP12	JP13	JP14	JP15
UMC U5S	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
AM486SX	Open	2 & 3	2 & 3	2 & 3	2 & 3
80486SX	Open	2 & 3	2 & 3	2 & 3	2 & 3
CX486DX (5v)	1 & 2, 3 & 4	1 & 2, 3 & 4, 5 & 6	1 & 2, 3 & 4	2 & 3	2 & 3
AM486DX	Open	2 & 3	1 & 2, 3 & 4	2 & 3	2 & 3
AM486DXL (5v)	2 & 3	2 & 3	1 & 2, 3 & 4	2 & 3	2 & 3
80486DX	Open	2 & 3	1 & 2, 3 & 4	2 & 3	2 & 3
SL80486DX	1 & 2	1 & 2	1 & 2, 3 & 4	2 & 3	2 & 3
CX486DX2 (5v)	1 & 2, 3 & 4	1 & 2, 3 & 4, 5 & 6	1 & 2, 3 & 4	2 & 3	2 & 3
CX486DX2-66 (3.6v)	1 & 2, 3 & 4	1 & 2, 3 & 4, 5 & 6	1 & 2, 3 & 4	1 & 2	1 & 2
CX486DX2-80 (4v)	1 & 2, 3 & 4	1 & 2, 3 & 4, 5 & 6	1 & 2, 3 & 4	1 & 2	1 & 2
AM486DX2	Open	2 & 3	1 & 2, 3 & 4	2 & 3	2 & 3
AM486DX2-80 (3.45v)	Open	2 & 3	1 & 2, 3 & 4	1 & 2	1 & 2
AM486DXL2 (5v)	2 & 3	2 & 3	1 & 2, 3 & 4	2 & 3	2 & 3
80486DX2	Open	2 & 3	1 & 2, 3 & 4	2 & 3	2 & 3
SL80486DX2	1 & 2	1 & 2	1 & 2, 3 & 4	2 & 3	2 & 3
AM486DX4 (3.45v)	Open	2 & 3	1 & 2, 3 & 4	1 & 2	1 & 2
SL80486DX4 (3.45v)	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2	1 & 2
SL80486DX4 (5v)	1 & 2	1 & 2	1 & 2, 3 & 4	2 & 3	2 & 3
P24D	1 & 2, 4 & 5	1 & 2, 4 & 5	1 & 2, 3 & 4	2 & 3	2 & 3
P24T	1 & 2	1 & 2	1 & 2, 3 & 4	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION (CON’T)
Type	JP16	JP17	JP18	JP19
UMC U5S	2 & 3	3 & 4	1 & 2	Open
AM486SX	2 & 3	Open	Open	Open
80486SX	2 & 3	Open	Open	Open
CX486DX (5v)	2 & 3	1 & 2	2 & 3, 4 & 5	2 & 3
AM486DX	2 & 3	1 & 2	Open	Open
AM486DXL (5v)	2 & 3	1 & 2, 3 & 4	1 & 2	Open
80486DX	2 & 3	1 & 2	Open	Open
SL80486DX	2 & 3	1 & 2	5 & 6	1 & 2, 3 & 4
CX486DX2 (5v)	2 & 3	1 & 2	2 & 3, 4 & 5	2 & 3
CX486DX2-66 (3.6v)	1 & 2	1 & 2	2 & 3, 4 & 5	2 & 3
CX486DX2-80 (4v)	1 & 2	1 & 2	2 & 3, 4 & 5	2 & 3
AM486DX2	2 & 3	1 & 2	Open	Open
AM486DX2-80 (3.45v)	1 & 2	1 & 2	Open	Open
AM486DXL2 (5v)	2 & 3	1 & 2, 3 & 4	1 & 2	Open
80486DX2	2 & 3	1 & 2	Open	Open
SL80486DX2	2 & 3	1 & 2	5 & 6	1 & 2, 3 & 4
AM486DX4 (3.45v)	1 & 2	1 & 2	Open	Open
SL80486DX4 (3.45v)	1 & 2	1 & 2	5 & 6	1 & 2, 3 & 4
SL80486DX4 (5v)	2 & 3	1 & 2	5 & 6	1 & 2, 3 & 4
P24D	2 & 3	1 & 2	3 & 4, 5 & 6	1 & 2, 3 & 4
P24T	2 & 3	2 & 3	5 & 6	1 & 2, 3 & 4
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION
Type	JP20	JP26	JP27
UMC U5S	Open	Open	Open
AM486SX	Open	Open	Open
80486SX	Open	Open	Open
CX486DX (5v)	Open	Open	Open
AM486DX	Open	Open	Open
AM486DXL (5v)	Open	Open	Open
80486DX	Open	Open	Open
SL80486DX	Open	Open	Open
CX486DX2 (5v)	Open	Open	Open
CX486DX2-66 (3.6v)	Open	Open	Pins 3 & 4closed
CX486DX2-80 (4v)	Open	Open	Pins 5 & 6closed
AM486DX2	Open	Open	Open
AM486DX2-80 (3.45v)	Open	Closed	Pins 1 & 2 closed
AM486DXL2 (5v)	Open	Open	Open
80486DX2	Open	Open	Open
SL80486DX2	Open	Open	Open
AM486DX4 (3.45v)	Open	Open	Pins 1 & 2 closed
SL80486DX4 (3.45v)	Open	Open	Pins 1 & 2 closed
SL80486DX4 (5v)	Open	Open	Open
P24D	Open	Open	Open
P24T	Open	Open	Open
Note: Pins designated should be in the closed position.