IBM Aptiva Handbook page 68

Use this setting to determine if the ROM from hardware
options will be copied to RAM. In general, when ROM is
copied to RAM, performance increases. However, in some
cases you might run into conflicts with software attempting
to use this same address space. If conflicts exist, you can
either reassign the addresses for the software, or disable
this setting.
Enabled Optional shadow is enabled
Disabled Optional shadow is disabled
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The following options are availble from the Plug and Play
Control menu.
PNP OS Installed
The BIOS has the capability to automatically configure all of
the boot and Plug and Play compatible devices. However,
this capability applies only when you are using a Plug and
Play Operating system such as Windows 98.
Select "Yes" if you are using a Plug and Play Operating
system.
Reset Configuration Data
Normally, you leave this field Disabled. Select Enabled to
reset Extended System Configuration Data (ESCD) when
you exit Setup if you have installed a new add-on and the
system reconfiguration has caused such a serious conflict
that the operating system cannot start.
Choices: Enabled, Disabled
6-10 Chapter 6: BIOS Setup configuration
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Use the options in this menu to configure the devices and I/
O ports in this computer.
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Use this setting to define the type of drive installed as drive
A.
None No floppy drive installed
720K, 3.5 in
3-1/2 inch double-sided drive; 720 kilobyte capacity
5-1/4 inch AT-type high-density drive; 1.2 megabyte
1.2M, 5.25 in capacity
1.44M, 3.5 in 3-1/2 inch double-sided drive; 1.44 megabyte capacity
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Determines the PS/2 Mouse function is enabled or disabled.
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Use this setting to enable or disable the video function that is
integrated on the system board.
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Use this setting to enable or disable the local area network
(LAN) function built into the computer.