It turns out that the IBM Bios on the Future Domain MCS700 SCSI board was conflicting with the ESDI controller built into the P70. The solution was simple...one of those things so simple you don't even consider until someone else points it out. I pulled the BIOS off of the SCSI card! I had initially tried disabling the BIOS in the system setup but that didn't work. Now that I've pulled the BIOS physically off the board, the conflicts have disappeared and I had both a CD-ROM and external 1gig SCSI hard disk running off of it's SCSI-2 connector in no time, using the IBM drivers for OS/2 and the Future Domain PowerSCSI 4 drivers under DOS. Too bad I lose the bootability doing this, but that's not an issue at the moment. Jeff