SB51G Problem with old Canon scanner FB630P

Hi,
I installed the optional parallel port on my SB51G to connect my scanner.
I had always the same error 0x00070800. Canon support wrote "the BIOS of the
PC should be set to ECP,EPP or PS-2 Bi-directional. I set yo ECP and dosen't
work.
They wrote too "In the BIOS set-up there are usually three memory address
options to choose from, the address that works is usually found by trial and
error....". I tried a lot of solution but it doesn't work.
Have an idea about this ? Have ever tried to connect a peripheral on the
optional port for a shuttle ?
Thank's in advance for your help.
Sorry for my English ! (I'm french !
A+
Tit