[Unix-jun72] Some discussion

Below I include part of an email I sent out to Brantley earlier on my plans. I've been using 7ed unix and "as" so far to compile the pieces of the source as they've become available. I have a "sys.s" file in the svn that defines the system calls per the u1.s file (Brantley says the older versions of "as" had the syscall table built in): $ as - sys.s u0.s ux.s and used that as a quick litmus test for syntax errors. Now that I am aware of apout I will probably start using the "as" from the 1972 bits. earlier comments: ----- As for putting the machine together, I've put together some notes in the svn under machine.txt. It seems to be a pdp 11/20 with 24kbytes ram, and rk03, rf, ttys on a dc-11, tape on tc-11. I think all of this should be fairly easy to set up in simh except the ttys (and console is only used in single user according to docs). Simh doesnt support 24kbyte ram setting, but 32k should prob work fine. Interestingly the kernel has a build mode ("cold") where it will build a new filesystem on disk, so that might make bringing up the system a little easier. There's a boot sequence that seems a little elaborate described in one of the 1st ed manuals, but probably for initial bring-up it would be sufficient to just deposit all the values in the right place with simh using a script to generate the simh config... If you have any suggestions, I'd love to hear them. I've played with pdp-11 in simh before, but a lot of this is still new to me. Tim Newsham http://www.thenewsh.com/~newsham/