Jerome Fine replies: Please help me understand? I have also used a so-called SCSI insider Iomega 100 MByte Zip drive on both a real DEC PDP-11 using a CQD 220/TM host adapter and on a PC using an Adaptec AHA-2940AU host adapter. On both the PDP-11 and the PC, I run RT-11 (under E11 on the PC with MOUNT DU0: SCSI0:). Originally, I was asked to convert a PDP-11 system from an RQDX3 to a CQD 200/M host adapter. When a removable media was needed, the Zip drive was used instead of the RX50. Since the media on the Zip drive have a larger capacity than the RD53 drives originally on that PDP-11 system, a single media backup using the Zip drive became possible. When did SCSI 50 pin Zip drives first appear? That seems to be almost 10 years ago. Later, it became possible to also use the same Zip media under E11 on a PC to run RT-11 or just to transfer files. I have also used the Sony SMO S-501 with excellent results on both the real DEC PDP-11 and the PC. Once I had a SCSI host adapter on both systems, the SCSI drives were no longer a problem. It is also possible to take a SCSI hard drive running RT-11 on a real DEC PDP-11 and use the drive as is to run RT-11 on a PC under E11, although I had to work around the problem that Windows 98 SE does not initially recognize the SCSI hard drive because Windows 98 SE requires the SCSI hard drive to be initialized with a FAT 16 or FAT 32 directory (even though the specified error under Windows 98 SE is that the SCSI hard drive is not formatted). Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.