[pups] PDP-11 (SIMH), Seventh Edition UNIX

Hi everyone, this is my first message, after being on the mailing list for the best part of three years :) I've a couple of [hopefully] simple questions about running Seventh Edition UNIX on SIMH. The first question is: how can I get the C compiler to work properly? When I've tried to compile programs, I get 'cannot create temp' - here's a full list of what's on the screen: @boot New Boot, known devices are hp ht rk rl rp tm vt : rl(0,0)rl2unix mem = 177856 # Thu Sep 22 07:50:47 EDT 1988 login: mark $ ed a main() { printf(" Hello.\n"); return; } . w a.c 46 q $ cc a.c cc: cannot create temp $ Also, how can I get the backspace key to erase? I've done /stty erase '^H'/ but I have to actually type <CTRL>+H to erase. The other thing I want to ask about is: can I compile SIMH on DOS, so it doesn't display any messages except those of the simulated software, and so it ignores ^E? I'm asking because I want v7 on an ancient laptop I've got lying around - a 486 with 24M of core. v7x86 won't work on it, and I don't really fancy putting Slack 3 back on it - if I'm going to go outdated, I might as well go the whole hog and go /really/ outdated. Though I might consider 2.11BSD, if that'll work on a machine with 24M of core, and if the escapes will display properly, because [24;1H[?1h=[;H[2J ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~[H is a little bit difficult to work with when I'm wanting to edit source code. Thanks very much. Mark Tuson.