Acer Altos 1100 Series - Manual (Page 69)

Chapter 2 - BIOS Utility 2-27
The Base Address and IRQ parameters are
configurable only if Parallel Port is enabled.
If you install an add-on card that has a
parallel port whose address conflicts with the
parallel
port onboard, the system
automatically disables the onboard functions.
Check the parallel port address on the add-
on card and change the address to one that
does not conflict.