Read and recognise optical drive

Hello everyone,
Just begin with QNX .
I have been able to get from a friend a QNX 4 PC with 2 optical drive ( and lot of optical CD for free !! ) .
I have download QNX 6 and install it with no problem but it does not see the the drive ! They are connect on a SCSI board , one is a MAXOPTIX T4-2600 and the other is a FUJISTSU M2513EL.
For some reason, QNX 6 does not see them . Can someone help ??

Many thanks in advance