Technical information

LS PRO OWNER'S HANDBOOK A/5
Inside the System Unit
Appendix A
When you enter the SIN, the BIOS Setup utility is started
automatically. Use the BIOS Setup utility to reconfigure the
hardware as described in Chapter 3. Reconfigure and re-enable
the security system as described in Chapter 6.
When you exit the BIOS Setup utility, the computer reboots
automatically.
Jumper PL18 - Selecting thick- or thin-Ethernet
This jumper selects which Ethernet port to use. Only one port
can be used at any one time. In the “Thin” position, with the
two pins connected, you can use the thin-Ethernet BNC port.
In the “Thick” position, with the pins disconnected, you can
use the thick-Ethernet AUI (DIX) port. In either position, you
can use the twisted-pair Ethernet port.
Jumper PL25 - Selecting the processor type
This jumper differentiates between different types of Intel
processor. Use the “SX” position if the computer is fitted with
an Intel486␣ SX. Use the “Other” position for any other
supported Intel processor (for example, Intel486␣ DX or DX2,
IntelDX4 or OverDrive).
Jumper PL19/20 - Selecting the external clock speed
This pair of jumpers sets the external clock speed for the system
processor. This must be either 25␣ MHz or 33␣ MHz. Remember
that the external clock speed is often only a fraction of the
processor’s internal clock speed, which is usually the one
advertised.
Note
Apricot does not support the use of external clock speeds of 20␣ MHz
or 40␣ MHz.