Yufeng Gao wrote: includes [https://www.tuhs.org/pipermail/tuhs/2025-February/031420.html] Hello Yufeng, Do you have more details on the format of the s1 tape? I want to reproduce your work. The s2 tape is in the tap format, which was easy to decode, and I assumed that s1 was similar, just with its file headers on an earlier tape. I’ve been able to fairly accurately segment s1 into files by observing that blocks duplicate the tail of the previous block when they are not a full 512 bytes. I’ve written a tool for this and have segmented all the text files and some of the binaries, but I’m floundering on the rest. What you say seems to suggest that s1 actually does have file metadata. Thalia