Hi all, recently we unearthed a set of pages that contain assembly listings of the PDP-7 Unix kernel and some associated user-mode programs. See the files 0*.pdf at http://www.tuhs.org/Archive/PDP-11/Distributions/research/McIlroy_v0/
There's a move afoot to see if we can bring this up on a real PDP-7 and also on SimH. I've set up a mailing list if anybody wants to help out, and my initial Github repository is at https://github.com/DoctorWkt/pdp7-unix I've got some PDP-7 questions and also some SimH PDP-7 questions. What is the format of disk blocks that SimH stores for the 18-bit systems? In other words, how are the 18-bit words in each block stored in the bytes of the host systems? At some point we will need to write a tool to generate a filesystem, so this information will be crucial. A general PDP-7 question: how are ASCII strings stored in memory? Are they 7-bit or 8-bit? I'm assuming that two ASCII characters are stored in one 18-bit word, but which bits go where? If I had the string "abcd", which bits go where in the two 18-bit words? Thanks in advance for all your help, and also thanks to RMS and others who wrote Simh as it's been an invaluable tool to keep the PDP-11 and Vax Unix systems going. Cheers, Warren _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
