Jerome Fine replies: It took a week of trying, but I have finally downloaded all three CD images for RSX-11 and RT-11 from: ftp://ftp.trailing-edge.com/pub/cd-images/ Note also that the file MD5SUMS seems to contain checksum values, but I don't know how to use these values or produce them myself to check if my files are correct. Can anyone help? The best time seems to be at night. Please realize that these are 650 MByte files and will take many hours in most cases, let alone a whole day (or three) if you do not have a high speed connection like DSL. 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.