CPU: Intel P IV 2 GHZ; RAM: 512 MB, Disk controller: Adaptec 2940 UW III - CHIPSET 7877; Hard Disk: 2 disk Quantum Atlas; OS: SCO Openserver 5 version 5.0.5. I tried to install with the next data in boot: prompt: defbootstr Sdsk=alad(0,0,0,0) link=alad, and, later I enter defbootstr hd=Sdsk Sdsk=alad(0,0,0,0) link=alad, and, the message changed for No Sdsk SCSI device configured (missing unit 0).