> -----Original Message----- > From: Chuck Guzis via cctalk <cctalk@classiccmp.org> > Sent: Thursday, September 21, 2023 3:39 PM > To: Dennis Boone via cctalk <cctalk@classiccmp.org> > Cc: Chuck Guzis <ccl...@sydex.com> > Subject: [cctalk] Re: IBM VM "CMS" tape format > > I slept on the problem a bit--good thing that I'm old; I like to sleep--and > think > that I've got it sussed out. > > Tape appears to consist of 4101 byte blocks, each with a "/02CMSx" > header; the first one seems to be "CMSF" with the intervening ones being > "CMSV" and then a final 87 byte block starting with "/02CMSN" and with > what appears to be file metadata, including the file name. The body of > the 4K+ blocks appears to be 80 character card images. Last block of each file > seems to be padded with nulls. > > I'll dig into it a bit today, but I believe that I'm on the right track. > > Unfortunately, the data itself is client-proprietary, so no sharing there, > sorry. > > What threw me was that there are 5 physical files on the tape (i.e. > blocks separated by tapemarks), so I was expecting something logical. > Silly me. > > Thanks, > Chuck
Take a look at the link I pointed you too. There is code in there to list the files on the tape and copy then to a PC disk. It will work with AWS files and physical tapes. Dave
