15
Jumpers
CPU Clock Speed Selection - JP39 and JP37
HOT-637 featuring CPU Plug & Play function, the user needn't to adjust onboard system clock
and CPU multiplier.
When the system power-on first time, BIOS will set CPU clock
speed to
233 MHz
automatically
. If your CPU speed higher than 233 MHz., you only have
to entry BIOS to set CPU speed to the higher one.
HOT-637 mainboard features a clock generator to provide adjustable system clock frequency.
JP39 is a 6-pin jumpers which determine the system clock frequency 50 MHz to 83 MHz.
CPU Plug & Play function is supported by
66MHz.
HOT-637 mainboard provides Jumper group of JP37 to figure the CPU core clock multiplier.
By inserting mini jumpers on MANUAL group, the user can figure the Host Bus Clock/CPU
Core Clock ratio (multiplier) manually.
CPU Plug & Play function is supported when an Jumper Pack inserted on
AUTO group.
Figure 2-27
Listed diagrams on right side show the sample position on jumper group of JP37:
1)
Setting CPU Clock from BIOS
- jumper pack on AUTO.
(Factory default)
2)
Adjust multiplier manually from hardware
- jumper pack on MANUAL, multiplier set to 4.5X manually.
Figure 2-27 shows the position of JP39 and JP37 on the mainboard.
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 hold-
ing 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.
