- 10 -
Jumpers
Several hardware settings are made through the use of jumper caps to connect jumper pins
on the main board. The jumper's pin 1 on main board will be on the top or on the left
when holding the main board with the keyboard connector away from yourself.
Jumpers with two pins will be shown as for Close (On) and for Open (Off).
To connect the pins, simply place a plastic jumper cap over the two pins.
CPU Clock Speed and ratio Selection - JP2, J113 and JP9
HOT-685Z mainboard features a clock generator to provide adjustable system clock
frequency. Jumpers JP2 and J113 determine the system clock frequency 66MHz to
150MHz. and JP9 is a 8-pin jumper which determine the processor clock ratio from
2X to 8X.
Figure 3-3 shows the position of JP2, J113
and JP9 on the mainboard.
Table 3-1 shows adjustable System clock
on jumper JP2 and J113.
Table 3-2 shows adjustable CPU Clock
Ratio on jumper group JP9.
Figure 3-3
Note
: Present PPGA Celeron CPU Clock ratio
is fixed and unable to adjust, for those processors,
JP9 is not functional.
CPU
Host Clock
JP2 and J113
66 MHz
75 MHz
83 MHz
100 MHz
103 MHz
112 MHz
124 MHz
133 MHz
140 MHz
150 MHz
Table 3-1
CPU
Clock Ratio
JP9
CPU
Clock Ratio
JP9
2 x
5.5 x
( 366 / 66 )
2.5 x
6 x
( 400 / 66 )
3 x
6.5 x
( 433 / 66 )
3.5 x
( 350 / 100 )
7 x
( 466 / 66 )
4 x
( 400 / 100 )
7.5 x
( 500 / 66 )
4.5 x
( 300 / 66 )
( 450 / 100 )
8 x
5 x
( 333 / 66 )
( 500 / 100 )
Table 3-2
