Tim Newsham wrote: Here's a diff against v36 and a tar of my working directory: http://www.unlambda.com/download/pdp11/unix-jun72/KE.diff http://www.unlambda.com/download/pdp11/unix-jun72/simhv36-1-ke.tar.gz I'm using this: set cpu 11/20 set hk disabled set rha disabled set tm disabled set rx disabled set rl disabled set tq disabled set rk3 enabled att rk3 rk3.dsk set tc enabled set rf enabled set ke enabled set cpu 32K load loadfile d pc 400 set cpu history=1000 attach rf rf0.dsk I forgot to include my a.out->loadfile conversion program. I'll check it in to svn. No - it writes a bunch of blocks to rf0 but no directories. The 'zero i list' appears to work, and the code to init i-node 41-47 runs but nothing gets written. Or if it does the wrong thing gets written. not sure why. To debug I sprinkle "halt"'s in the code and then do "show cpu history" to see what happened. As a sanity check I also do 'e 0-40' and 'e 400-440' to make sure location 34 (iot vector) is filled in and the code at 400 is correct (it loads the sp with 60000). I might turn on some RF debug to see exactly what gets written when. -brad