HOT-433 (REV. 1) Motherboard Settings and Configuration

SHUTTLE COMPUTER INTERNATIONAL, INC.

HOT-433 (REV. 1)

Processor
CX486M6/80486SX/SL80486SX/UMCU5/CX486DX/AM486DX/80486DX/SL80486DX/CX486DX2/AM486DX2/8046DX2/SL80486DX2/CX486DX4/AM486DX4/80468DX4/P24D/P24T
Processor Speed
25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/ 100(internal)MHz
Chip Set
UMC
Maximum Onboard Memory
256MB
Cache
128/256/512/1024KB
BIOS
AMI
Dimensions
260mm x 220mm
I/O Options
32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2)
NPU Options
None

CONNECTIONS
Function
Label
Function
Label
External battery
CN1
Green PC connector
JP6
Serial port 2
CN2
Reset switch
JP33
Serial port 1
CN3
Turbo switch
JP34
Parallel port
CN4
Green PC connector
JP35
Floppy drive interface
CN5
Green PC LED
LED1
IDE interface 2
CN6
IDE interface LED
LED2
IDE interface 1
CN7
PS/2 mouse port
MS1
Speaker
CN8
32-bit PCI slots
PC1 - PC4
Power LED & keylock
CN9

USER CONFIGURABLE SETTINGS
Setting
Label
Position

Flash BIOS voltage select 5v
JP8
Pins 2 & 3 closed

Flash BIOS voltage select 12v
JP8
Pins 1 & 2 closed

DRAM
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(1) 256K x 36
None
None
None
2MB
(1) 256K x 36
(1) 256K x 36
None
None
2MB
(1) 512K x 36
None
None
None
3MB
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
None
4MB
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
4MB
(1) 512K x 36
(1) 512K x 36
None
None
4MB
(1) 1M x 36
None
None
None
6MB
(1) 512K x 36
(1) 512K x 36
(1) 512K x 36
None
6MB
(1) 256K x 36
(1) 256K x 36
(1) 512K x 36
(1) 512K x 36
8MB
(1) 512K x 36
(1) 512K x 36
(1) 512K x 36
(1) 512K x 36
8MB
(1) 1M x 36
(1) 1M x 36
None
None
8MB
(1) 2M x 36
None
None
None
10MB
(1) 256K x 36
(1) 256K x 36
(1) 1M x 36
(1) 1M x 36
12MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
None
12MB
(1) 512K x 36
(1) 512K x 36
(1) 1M x 36
(1) 1M x 36
16MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
16MB
(1) 2M x 36
(1) 2M x 36
None
None
16MB
(1) 4M x 36
None
None
None
18MB
(1) 256K x 36
(1) 256K x 36
(1) 2M x 36
(1) 2M x 36
20MB
(1) 512K x 36
(1) 512K x 36
(1) 2M x 36
(1) 2M x 36
24MB
(1) 2M x 36
(1) 2M x 36
(1) 2M x 36
None
24MB
(1) 1M x 36
(1) 1M x 36
(1) 2M x 36
(1) 2M x 36
32MB
(1) 2M x 36
(1) 2M x 36
(1) 2M x 36
(1) 2M x 36
32MB
(1) 4M x 36
(1) 4M x 36
None
None

DRAM (CON’T)
Size
Bank 0
Bank 1
Bank 2
Bank 3
32MB
(1) 8M x 36
None
None
None
34MB
(1) 256K x 36
(1) 256K x 36
(1) 4M x 36
(1) 4M x 36
36MB
(1) 512K x 36
(1) 512K x 36
(1) 4M x 36
(1) 4M x 36
40MB
(1) 1M x 36
(1) 1M x 36
(1) 4M x 36
(1) 4M x 36
48MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
None
48MB
(1) 2M x 36
(1) 2M x 36
(1) 4M x 36
(1) 4M x 36
64MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
64MB
(1) 8M x 36
(1) 8M x 36
None
None
64MB
(1) 16M x 36
None
None
None
66MB
(1) 256K x 36
(1) 256K x 36
(1) 8M x 36
(1) 8M x 36
68MB
(1) 512K x 36
(1) 512K x 36
(1) 8M x 36
(1) 8M x 36
72MB
(1) 1M x 36
(1) 1M x 36
(1) 8M x 36
(1) 8M x 36
80MB
(1) 2M x 36
(1) 2M x 36
(1) 8M x 36
(1) 8M x 36
96MB
(1) 8M x 36
(1) 8M x 36
(1) 8M x 36
None
96MB
(1) 4M x 36
(1) 4M x 36
(1) 8M x 36
(1) 8M x 36
128MB
(1) 8M x 36
(1) 8M x 36
(1) 8M x 36
(1) 8M x 36
128MB
(1) 16M x 36
(1) 16M x 36
None
None
160MB
(1) 4M x 36
(1) 4M x 36
(1) 16M x 36
(1) 16M x 36
192MB
(1) 16M x 36
(1) 16M x 36
(1) 16M x 36
None
192MB
(1) 8M x 36
(1) 8M x 36
(1) 16M x 36
(1) 16M x 36
256MB
(1) 16M x 36
(1) 16M x 36
(1) 16M x 36
(1) 16M x 36

CACHE SIZE
Size
Bank 0
Bank 1
TAG
128KB
(4) 32K x 8
None
(1) 8K x 8
256KB (A)
(4) 32K x 8
(4) 32K x 8
(1) 32K x 8
256KB (B)
(4) 64K x 8
None
(1) 32K x 8
512KB (A)
(4) 128K x 8
None
(1) 32K x 8
512KB (B)
(4) 64K x 8
(4) 64K x 8
(1) 32K x 8
1MB
(4) 128K x 8
(4) 128K x 8
(1) 64K x 8

CACHE JUMPER
Size
JP11
JP12
JP13
JP14
128KB
Open
Open
2 & 3
Open
256KB (A)
Open
Open
1 & 2
1 & 2
256KB (B)
Open
1 & 2
2 & 3
1 & 2
512KB (A)
1 & 2
1 & 2
2 & 3
1 & 2, 3 & 4
512KB (B)
Open
2 & 3
1 & 2
1 & 2, 3 & 4
1MB
2 & 3
2 & 3
1 & 2
1 & 2, 3 & 4, 5 & 6
Note: Pins designated should be in the closed position.

CPU TYPE
Setting
JP10
JP17
JP19
JP20
JP21
CX486M6
1 & 3, 4 & 6
2 & 3
3 & 4
1 & 2, 3 & 4
1 & 2
80486SX
1 & 3, 2 & 4
Open
1 & 2
Open
Open
SL80486SX
1 & 3, 2 & 4
1 & 2
3 & 4
2 & 3, 4 & 5
1 & 2
UMC U5
2 & 4, 3 & 5
Open
1 & 2
Open
2 & 3
CX486DX
1 & 3, 4 & 6
2 & 3
3 & 4
1 & 2, 3 & 4
1 & 2
AM486DX
1 & 3, 2 & 4
Open
1 & 2
Open
Open
80486DX
1 & 3, 2 & 4
Open
1 & 2
Open
Open
SL80486DX
1 & 3, 2 & 4
1 & 2
3 & 4
2 & 3, 4 & 5
1 & 2
CX486DX2
1 & 3, 4 & 6
2 & 3
3 & 4
1 & 2, 3 & 4
1 & 2
AM486DX2
1 & 3, 2 & 4
Open
1 & 2
Open
Open
80486DX2
1 & 3, 2 & 4
Open
1 & 2
Open
Open
SL80486DX2
1 & 3, 2 & 4
1 & 2
3 & 4
2 & 3, 4 & 5
1 & 2
CX486DX4
1 & 3, 4 & 6
1 & 2
3 & 4
2 & 3, 4 & 5
1 & 2
AM486DX4
1 & 3, 2 & 4
Open
1 & 2
Open
Open
80486DX4
1 & 3, 2 & 4
1 & 2
3 & 4
2 & 3, 4 & 5
1 & 2
P24D
1 & 3, 2 & 4
1 & 2
3 & 4
2 & 3, 4 & 5
1 & 2
P24T
1 & 3, 2 & 4
1 & 2
3 & 4, 5 & 6
2 & 3, 4 & 5
1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE (CON’T)
Setting
JP22
JP23
JP25
JP26
JP27
CX486M6
Open
Open
2 & 3
2 & 3
1 & 2
80486SX
Open
Open
2 & 3
Open
Open
SL80486SX
Open
Open
2 & 3
Open
Open
UMC U5
Open
Open
2 & 3
1 & 2
2 & 3
CX486DX
Open
Open
2 & 3
2 & 3
1 & 2
AM486DX
Open
Open
2 & 3
Open
Open
80486DX
Open
Open
2 & 3
Open
Open
SL80486DX
Open
Open
2 & 3
Open
Open
CX486DX2
Open
Open
2 & 3
2 & 3
1 & 2
AM486DX2
Open
Open
2 & 3
Open
Open
80486DX2
Open
Open
2 & 3
Open
Open
SL80486DX2
Open
Open
2 & 3
Open
Open
CX486DX4
Open
Open
2 & 3
2 & 3
1 & 2
AM486DX4
Open
Open
2 & 3
Open
Open
80486DX4
Open
Open
2 & 3
Open
Open
P24D
Closed
Closed
2 & 3
Open
Open
P24T
Open
Open
2 & 3
1 & 2
2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE (CON’T)
Setting
JP28
JP29
JP30
JP31
JP32
CX486M6
2 & 3
1 & 2
Open
Open
Open
80486SX
2 & 3
Open
Open
Open
Open
SL80486SX
2 & 3
Open
Open
Open
Open
UMC U5
2 & 3
3 & 4
1 & 2, 3 & 4
Open
Open
CX486DX
1 & 2, 3 & 4
2 & 3
3 & 4
Open
Open
AM486DX
1 & 2, 3 & 4
Open
3 & 4
Open
Open
80486DX
1 & 2, 3 & 4
Open
3 & 4
Open
Open
SL80486DX
1 & 2, 3 & 4
Open
3 & 4
Open
Open
CX486DX2
1 & 2, 3 & 4
2 & 3
3 & 4
Open
Open
AM486DX2
1 & 2, 3 & 4
Open
3 & 4
Open
Open
80486DX2
1 & 2, 3 & 4
Open
3 & 4
Open
Open
SL80486DX2
1 & 2, 3 & 4
Open
3 & 4
Open
Open
CX486DX4
1 & 2, 3 & 4
Open
3 & 4
Open
Open
AM486DX4
1 & 2, 3 & 4
Open
3 & 4
Open
Open
80486DX4
1 & 2, 3 & 4
Open
3 & 4
Open
Open
P24D
1 & 2, 3 & 4
Open
3 & 4
Closed
Closed
P24T
1 & 2, 3 & 4
3 & 4
2 & 3
Open
Open
Note: Pins designated should be in the closed position.

CPU TYPE (P24D ONLY)
Setting
JP24
Write back
Pins 2 & 3 closed
Write through
Pins 1 & 2 closed
Other CPU types
Open

CPU SPEED
Setting
JP1
JP2
JP3
25MHz
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 1 & 2 closed
33MHz
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
40MHz
Pins 2 & 3 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
50iMHz
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 1 & 2 closed
50MHz
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
66iMHz
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
80iMHz
Pins 2 & 3 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
100iMHz
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed

CPU MULTIPLIER (DX4 ONLY)
Internal clock
External clock
JP18
75iMHz
25MHz
Open
100iMHz
33MHz
Open
100iMHz
50MHz
Pins 2 & 3 closed

CPU MULTIPLIER (AM486DX2/DX4 ONLY)
Internal clock
External clock
JP24
75iMHz
25MHz
Pins 2 & 3 closed
80iMHz
40MHz
Pins 1 & 2 closed
100iMHz
33MHz
Pins 2 & 3 closed
100iMHz
50MHz
Pins 1 & 2 closed
Other CPU types

Open

CPU VOLTAGE
Setting
JP9
JP15
JP16
3.3v
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
3.45v
Pins 3 & 4 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
3.6v
Pins 5 & 6 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
4v
Pins 7 & 8 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
5v
Any setting
Pins 1 & 2 closed
Pins 1 & 2 closed

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Processor	CX486M6/80486SX/SL80486SX/UMCU5/CX486DX/AM486DX/80486DX/SL80486DX/CX486DX2/AM486DX2/8046DX2/SL80486DX2/CX486DX4/AM486DX4/80468DX4/P24D/P24T
Processor Speed	25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/ 100(internal)MHz
Chip Set	UMC
Maximum Onboard Memory	256MB
Cache	128/256/512/1024KB
BIOS	AMI
Dimensions	260mm x 220mm
I/O Options	32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2)
NPU Options	None

CONNECTIONS
Function	Label	Function	Label
External battery	CN1	Green PC connector	JP6
Serial port 2	CN2	Reset switch	JP33
Serial port 1	CN3	Turbo switch	JP34
Parallel port	CN4	Green PC connector	JP35
Floppy drive interface	CN5	Green PC LED	LED1
IDE interface 2	CN6	IDE interface LED	LED2
IDE interface 1	CN7	PS/2 mouse port	MS1
Speaker	CN8	32-bit PCI slots	PC1 - PC4
Power LED & keylock	CN9

USER CONFIGURABLE SETTINGS
Setting		Label	Position
	Flash BIOS voltage select 5v	JP8	Pins 2 & 3 closed
	Flash BIOS voltage select 12v	JP8	Pins 1 & 2 closed

DRAM
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	None	None	None
2MB	(1) 256K x 36	(1) 256K x 36	None	None
2MB	(1) 512K x 36	None	None	None
3MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	None
4MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
4MB	(1) 512K x 36	(1) 512K x 36	None	None
4MB	(1) 1M x 36	None	None	None
6MB	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36	None
6MB	(1) 256K x 36	(1) 256K x 36	(1) 512K x 36	(1) 512K x 36
8MB	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36	(1) 512K x 36
8MB	(1) 1M x 36	(1) 1M x 36	None	None
8MB	(1) 2M x 36	None	None	None
10MB	(1) 256K x 36	(1) 256K x 36	(1) 1M x 36	(1) 1M x 36
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	None
12MB	(1) 512K x 36	(1) 512K x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 2M x 36	(1) 2M x 36	None	None
16MB	(1) 4M x 36	None	None	None
18MB	(1) 256K x 36	(1) 256K x 36	(1) 2M x 36	(1) 2M x 36
20MB	(1) 512K x 36	(1) 512K x 36	(1) 2M x 36	(1) 2M x 36
24MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	None
24MB	(1) 1M x 36	(1) 1M x 36	(1) 2M x 36	(1) 2M x 36
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
32MB	(1) 4M x 36	(1) 4M x 36	None	None

DRAM (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
32MB	(1) 8M x 36	None	None	None
34MB	(1) 256K x 36	(1) 256K x 36	(1) 4M x 36	(1) 4M x 36
36MB	(1) 512K x 36	(1) 512K x 36	(1) 4M x 36	(1) 4M x 36
40MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	None
48MB	(1) 2M x 36	(1) 2M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 8M x 36	(1) 8M x 36	None	None
64MB	(1) 16M x 36	None	None	None
66MB	(1) 256K x 36	(1) 256K x 36	(1) 8M x 36	(1) 8M x 36
68MB	(1) 512K x 36	(1) 512K x 36	(1) 8M x 36	(1) 8M x 36
72MB	(1) 1M x 36	(1) 1M x 36	(1) 8M x 36	(1) 8M x 36
80MB	(1) 2M x 36	(1) 2M x 36	(1) 8M x 36	(1) 8M x 36
96MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	None
96MB	(1) 4M x 36	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36
128MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
128MB	(1) 16M x 36	(1) 16M x 36	None	None
160MB	(1) 4M x 36	(1) 4M x 36	(1) 16M x 36	(1) 16M x 36
192MB	(1) 16M x 36	(1) 16M x 36	(1) 16M x 36	None
192MB	(1) 8M x 36	(1) 8M x 36	(1) 16M x 36	(1) 16M x 36
256MB	(1) 16M x 36	(1) 16M x 36	(1) 16M x 36	(1) 16M x 36

CACHE SIZE
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	None	(1) 8K x 8
256KB (A)	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8
256KB (B)	(4) 64K x 8	None	(1) 32K x 8
512KB (A)	(4) 128K x 8	None	(1) 32K x 8
512KB (B)	(4) 64K x 8	(4) 64K x 8	(1) 32K x 8
1MB	(4) 128K x 8	(4) 128K x 8	(1) 64K x 8

CACHE JUMPER
Size	JP11	JP12	JP13	JP14
128KB	Open	Open	2 & 3	Open
256KB (A)	Open	Open	1 & 2	1 & 2
256KB (B)	Open	1 & 2	2 & 3	1 & 2
512KB (A)	1 & 2	1 & 2	2 & 3	1 & 2, 3 & 4
512KB (B)	Open	2 & 3	1 & 2	1 & 2, 3 & 4
1MB	2 & 3	2 & 3	1 & 2	1 & 2, 3 & 4, 5 & 6
Note: Pins designated should be in the closed position.

CPU TYPE
Setting	JP10	JP17	JP19	JP20	JP21
CX486M6	1 & 3, 4 & 6	2 & 3	3 & 4	1 & 2, 3 & 4	1 & 2
80486SX	1 & 3, 2 & 4	Open	1 & 2	Open	Open
SL80486SX	1 & 3, 2 & 4	1 & 2	3 & 4	2 & 3, 4 & 5	1 & 2
UMC U5	2 & 4, 3 & 5	Open	1 & 2	Open	2 & 3
CX486DX	1 & 3, 4 & 6	2 & 3	3 & 4	1 & 2, 3 & 4	1 & 2
AM486DX	1 & 3, 2 & 4	Open	1 & 2	Open	Open
80486DX	1 & 3, 2 & 4	Open	1 & 2	Open	Open
SL80486DX	1 & 3, 2 & 4	1 & 2	3 & 4	2 & 3, 4 & 5	1 & 2
CX486DX2	1 & 3, 4 & 6	2 & 3	3 & 4	1 & 2, 3 & 4	1 & 2
AM486DX2	1 & 3, 2 & 4	Open	1 & 2	Open	Open
80486DX2	1 & 3, 2 & 4	Open	1 & 2	Open	Open
SL80486DX2	1 & 3, 2 & 4	1 & 2	3 & 4	2 & 3, 4 & 5	1 & 2
CX486DX4	1 & 3, 4 & 6	1 & 2	3 & 4	2 & 3, 4 & 5	1 & 2
AM486DX4	1 & 3, 2 & 4	Open	1 & 2	Open	Open
80486DX4	1 & 3, 2 & 4	1 & 2	3 & 4	2 & 3, 4 & 5	1 & 2
P24D	1 & 3, 2 & 4	1 & 2	3 & 4	2 & 3, 4 & 5	1 & 2
P24T	1 & 3, 2 & 4	1 & 2	3 & 4, 5 & 6	2 & 3, 4 & 5	1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE (CON’T)
Setting	JP22	JP23	JP25	JP26	JP27
CX486M6	Open	Open	2 & 3	2 & 3	1 & 2
80486SX	Open	Open	2 & 3	Open	Open
SL80486SX	Open	Open	2 & 3	Open	Open
UMC U5	Open	Open	2 & 3	1 & 2	2 & 3
CX486DX	Open	Open	2 & 3	2 & 3	1 & 2
AM486DX	Open	Open	2 & 3	Open	Open
80486DX	Open	Open	2 & 3	Open	Open
SL80486DX	Open	Open	2 & 3	Open	Open
CX486DX2	Open	Open	2 & 3	2 & 3	1 & 2
AM486DX2	Open	Open	2 & 3	Open	Open
80486DX2	Open	Open	2 & 3	Open	Open
SL80486DX2	Open	Open	2 & 3	Open	Open
CX486DX4	Open	Open	2 & 3	2 & 3	1 & 2
AM486DX4	Open	Open	2 & 3	Open	Open
80486DX4	Open	Open	2 & 3	Open	Open
P24D	Closed	Closed	2 & 3	Open	Open
P24T	Open	Open	2 & 3	1 & 2	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE (CON’T)
Setting	JP28	JP29	JP30	JP31	JP32
CX486M6	2 & 3	1 & 2	Open	Open	Open
80486SX	2 & 3	Open	Open	Open	Open
SL80486SX	2 & 3	Open	Open	Open	Open
UMC U5	2 & 3	3 & 4	1 & 2, 3 & 4	Open	Open
CX486DX	1 & 2, 3 & 4	2 & 3	3 & 4	Open	Open
AM486DX	1 & 2, 3 & 4	Open	3 & 4	Open	Open
80486DX	1 & 2, 3 & 4	Open	3 & 4	Open	Open
SL80486DX	1 & 2, 3 & 4	Open	3 & 4	Open	Open
CX486DX2	1 & 2, 3 & 4	2 & 3	3 & 4	Open	Open
AM486DX2	1 & 2, 3 & 4	Open	3 & 4	Open	Open
80486DX2	1 & 2, 3 & 4	Open	3 & 4	Open	Open
SL80486DX2	1 & 2, 3 & 4	Open	3 & 4	Open	Open
CX486DX4	1 & 2, 3 & 4	Open	3 & 4	Open	Open
AM486DX4	1 & 2, 3 & 4	Open	3 & 4	Open	Open
80486DX4	1 & 2, 3 & 4	Open	3 & 4	Open	Open
P24D	1 & 2, 3 & 4	Open	3 & 4	Closed	Closed
P24T	1 & 2, 3 & 4	3 & 4	2 & 3	Open	Open
Note: Pins designated should be in the closed position.

CPU TYPE (P24D ONLY)
Setting	JP24
Write back	Pins 2 & 3 closed
Write through	Pins 1 & 2 closed
Other CPU types	Open

CPU SPEED
Setting	JP1	JP2	JP3
25MHz	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
33MHz	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
40MHz	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
50iMHz	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
50MHz	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
66iMHz	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
80iMHz	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
100iMHz	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed

CPU MULTIPLIER (DX4 ONLY)
Internal clock	External clock	JP18
75iMHz	25MHz	Open
100iMHz	33MHz	Open
100iMHz	50MHz	Pins 2 & 3 closed

CPU MULTIPLIER (AM486DX2/DX4 ONLY)
Internal clock	External clock	JP24
75iMHz	25MHz	Pins 2 & 3 closed
80iMHz	40MHz	Pins 1 & 2 closed
100iMHz	33MHz	Pins 2 & 3 closed
100iMHz	50MHz	Pins 1 & 2 closed
Other CPU types		Open

CPU VOLTAGE
Setting	JP9	JP15	JP16
3.3v	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
3.45v	Pins 3 & 4 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
3.6v	Pins 5 & 6 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
4v	Pins 7 & 8 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
5v	Any setting	Pins 1 & 2 closed	Pins 1 & 2 closed