I finally succeded in installing the board. Its more a setup problem than a typically debian quaestion.
1) in the bios setup I left all the interrupts as PnP execpt #10 which is configured on the board (11 is the default but there was an IRQ conflict with the graphics adapter under win). #10 is reserved for legacy ISA boards in the manual bios setup. 2) All aha152x options at boot time, in lilo.conf or modules.conf fail. I have to use insmod aha152x aha152x=0x340,10. I think that it is the only way to skip the adapter bios probe, madatory since this dumb card doens't have one. Probably for the same reason, modprobe fails. Now, I have a question regarding debian boot process : where is the right place to insmod the module ? I can write a simple script with the insmod line and put it in /etc/init.d. Ok ? Then I have to make a link from directories for the run-level I want the scanner to be usable by everyone. Which run-level is it ? What must be the name of this link ? thanks.