Acer 9100 System Manual page 106

This item allows you to set the operation mode of the parallel port.
Setting
Standard Parallel Port (SPP)
Standard and Bidirectional
Enhanced Parallel Port (EPP)
Extended Capabilities Port
(ECP)
BIOS Utility
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
onboard parallel
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.
Operation Mode
Allows normal speed one-way
operation
Allows normal speed operation in a
two-way mode
Allows bidirectional parallel port
operation at maximum speed
Allows parallel port to operate in
bidirectional mode and at a speed
higher than the maximum data
transfer rate
port, the system
Function
3-25