Your SCSI controler detects it and negotiates fine? But windows doesnt see it?
you try booting with a DOS disk, wiht the ASPI8DOS drivers loaded and doing a ASPICD.sys type thing and then the MSCDEX deal to see if it will detect that way in DOS?
( you can tell I have used SCSI way back into teh DOS days

ASPI2DOS all the way!)