On Tue, Mar 16, 2021 at 12:04 AM Lars Brinkhoff via cctalk < cctalk at classiccmp.org> wrote: > Interesting to see the DECtape file structure format. > IIRC, the DECtape file structure is documented in the Monitor Calls manual. The disk file structure is not, though there are many references to Retrieval Information Blocks (RIBs) and such.