Adaptec SBC-599 - Manual (Page 26)

16 SBC-596/599 User's Manual
MTXC CLK Setting/P55C Enabled (J7)
This jumper setting provides Intel MTXC chipset 66/60 MHz
frequency. You can Enable/Disable P55C CPUs with pin 1 and
pin 2 close/open.
J7 MTXC CLK Setting
66 Hz* 60 Hz
J7
3 4 3 4
J7 P55C Enabled/Disabled
Enabled* Disabled
J7
1 2 1 2
* default setting
Clock Setting (J8)
J8 must be set together with J5 jumper to match the CPU internal
frequency. The clock frequency times the Frequency Ratio equals
the CPU’s internal frequency.
J8 Clock Setting
CPU 55 60 66* 75
PCI 27.5 30 33.3 37.5
J8
* default setting