Technical information

LS PRO OWNER'S HANDBOOK 3/11
Using the BIOS Setup utility
Chapter 3
Option Meaning if selected
Floppy Disk Disables the diskette drive controller.
Floppy Write Disables the computer’s ability to write to the
diskette drive.
Floppy Boot Disables the computer’s ability to boot from a
system diskette in the diskette drive.
Parallel Port Disables the parallel port, freeing interrupt IRQ7
and I/O ports 3BCh-3BFh. However, IRQ7 can
usually be “double-booked” without affecting the
operation of the parallel port.
Serial Port 1 Disables serial port 1, freeing interrupt IRQ4 and
I/O ports 3F8h-3FFh.
Serial Port 2 Disables serial port 2, freeing interrupt IRQ3 and
I/O ports 2F8h-2FFh.
Hard Disk Controller Disables the hard disk controller, freeing I/O ports
1F0h-1F8h and 3F6h-3F7h.
Ethernet Disables the on-board network adapter, freeing
interrupt IRQ5 and I/O ports 300h-317h.
(However, interrupt IRQ5, even if free, cannot be
used by the PCMCIA interface.)
BIOS Copy At 16MB Disables the “copy” of the computer’s BIOS ROM
which normally appears in the computer’s address
space just below 16 Mbytes (between FE0000h and
FFFFFFh). This is not a real copy, just the same
ROM addressed through a different (higher) set
of memory addresses. This copy must be disabled
if your computer actually has 16 Mbytes (or more)
system memory, or the two will conflict.
i486 Cache Disables the memory cache inside the system
processor.
External Cache Disables the external, or second-level memory
cache, outside the system processor.
BIOS Shadowing Disables the scheme whereby the contents of the
computer’s BIOS ROM are copied into system
memory, where they can be accessed more quickly.
Large HD Translation Disables the scheme (known as Extended CHS)
whereby the BIOS is able to access hard disk drives
of greater than 504 Mbytes capacity. You might
need to do this if your operating system does not
support Extended CHS, in which case the drive
will appear to have less than its full capacity.