On Mon, Nov 21, 2016 at 4:04 PM, Noel Chiappa <j...@mercury.lcs.mit.edu> wrote:
> > From: Josh Dersch > > > I'm finally turning my attention back to my 11/40 (which I started > > working on 7 years ago and never quite got around to finishing -- > I've > > learned a lot since then and I'm hoping to be able to debug it > properly > > now). > > A KM11 might help, if you have one: there are a couple of sources for new > ones > (I got mine from Guy), it will allow you to single-step the microcode, etc, > etc. > I do have a set (got it from Guy years ago, for the express purpose of debugging the 11/40) and I successfully used it to debug my 11/05. The 11/40 is mostly working; I have a bootstrap terminator in it and it runs the diag/console PROM without problems and stuff I toggle in seems to work, but I've been unable to boot anything (like XXDP, for example). There is some random behavior and there are some oddities about it-- Slot 9 of the CPU backplane is supposed to be an SPC slot but it doesn't seem to work, and years ago I found a missing wire in the backplane. So things are in a very random state and I need to spend some time sorting things out. > > > My ultimate goal is to run V6 or V7 UNIX on it -- I have the MMU but > > I'm looking for an M787 (line-time clock) and M7237 (stack limit > > register) to complete the set. > > You don't need the SLR to run Unix V6 (in fact, IIRC, it doesn't use it). > For > the clock, you don't absolutely have to have a KW11-L, you can substitute a > KW11-P - but V6 _has_ to have one or the other, or it panic()'s - some > things > in the kernel have to have a working clock. > Thanks, that's good to know -- I assumed I needed the KJ11-A because the KT11-D manual specifies (bottom of page 2-1): "When the KT11-D Memory Management Option is added to an existing PDP-11 system, the KJ11-A Stack Limit Register Option must also be added." So I assumed the MMU required this option be present... > > You will also need the KE11-E (M7238), as the Unix C compiler emits MUL, > DIV > etc, and even the bootstrap uses them. The KE11-F (M7239) is useless; the > V6 > Unix C compiler doesn't generate that type of PDP-11 floating point. > Yeah, that might be harder to find, I'd forgotten about that requirement. I suppose I could run Ultrix-11 instead (I have that on my 11/34 at the moment) as it'll run sans floating point hardware, though it's a tight squeeze... - Josh > > Noel >
