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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 - JP6 and JP10
HOT-687 mainboard features a clock generator to provide adjustable system clock fre-
quency. JP6 is a 8-pin jumpers which determine the system clock frequency 66 MHz to 150
MHz. and JP10 is a 8-pin jumper which determine the processor clock ratio from 2X to 8X.
Figure 2-3 shows the position of JP6 and JP10 on the mainboard.
Table 2-1 shows adjustable System clock on jumper JP6.
Table 2-2 shows adjustable CPU Clock Ratios on jumper group JP10.
System Clock (JP6)
66 MHz
112 MHz
75 MHz
124 MHz
83 MHz
133 MHz
100 MHz
140 MHz
103 MHz
150 MHz
Multiplier JP10
2X
2.5X
3X
3.5X
4X
4.5X
5X
(300/100)
(350/100)
(400/100)
(300/66)
(450/100)
(333/66)
(500/100)
5.5X
6X
6.5X
7X
7.5X
8X
(366/66)
(400/66)
(433/66)
(466/66)
(500/66)
Table 2-2
Figure 2-3
Table 2-1
Note
: Present PPGA Celeron CPU Clock ratio is fixed and unable to adjust, for those
processors, JP10 is not functional.
