System Frequency
Frequency ratio
Speed rate
JP8, JP9
1996.09
CPU freq.= Freq. rate x System freq.
JP9
75/90/100 = 1.5 x system clock
2~3
110/120/133 = 2 x system clock
1~2
150/166 = 2.5 x system clock
1~2
180/200 = 3 x system clock
2~3
JP15, JP16
Jumper Setting Quick ReferenceJumper Setting Quick Reference
Jumper Setting Quick Reference
Jumper Setting Quick ReferenceJumper Setting Quick Reference
J1/J2: Infra Red connector
J4: Hard disk LED header
J5: System reset switch header
J7: Speaker header
J8: Power good LED header
JP1: Green LED header
JP3: ATX Soft power switch header
JP4: Green switch header
JPX2: CMOS data clear setting jumper
2~3 short: Normal (default)
1~2 short: Clear CMOS data
JP6: Keyboard grounding setting jumper
To decrease the EMI radiation, we
suggest you open this header after
finishing the system assembly.
JP10: CPU cooling Fan header
GND
JP15/JP16: External cache size
jumper setting
Cache
Cache
size
on Board
256KB 32K*32 x 2 --
512KB 32K*32 x 2 32K*32 x 2
Cache
Module
1
JP15
JP16
1
JP15 JP16
M101
PS/2 Keyboard
Conn.
J3
PS/2 Mouse Conn.
P2
P1
For VRT (Voltage Reduction Technology) processor (such as Intel P55C), the
split power plan (CPU's core voltage = CPU's I/O voltage) design is required.
CPU Core Voltage
JP7 JP11
Core
Vcc
2.5
2.7
2.8
2.9
CPU I/O Voltage
JP11
Vcc
3.3
3.4
3.5
I/O
CPU-type S-spce
P54C-75 3.3 50 x1.5
QO653
QO655
SZ978
SX957
SX959
P54C-90
P54C-120
Intel
P54C-150 x2.5
P54C-100
P54C-133 x2
P54C-166 x2.5
P54C-200 x3
K5-PR75
AMD
K5-PR100 66
QO654
SX958
QO708
QO656
QO657
ABQ
CPU Power Voltage
Vcc JP7 JP11 MHz JP13, JP14
JP11
1
3.3
3.4
3.5
3.3
3.5
JP7
3.3
3.4
3.5
3.5
JP8
2~3
2~3
1~2
1~2
JP11
1
JP11
1
JP11
1
JP11
1
JP11
1
JP11
1
JP11
1
JP11
1
JP11
1
60
66
50
JP13,JP14
1
JP13,JP14
1
JP13,JP14
1
JP13,JP14
1
JP13,JP14
1
JP13,JP14
1
x1.5
x2
x1.5
1.5K5-PR90 60
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
JP9
JP8
1
U20: Adding an extra Tag-RAM(32K*8)
to expand DRAM cacheable range up to
512MB
V.2
30-A
586HTM0.1586HTM0.1
586HTM0.1
586HTM0.1586HTM0.1
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