On Mon, Jul 6, 2015 at 3:41 PM, Mark Pizzolato - Info Comm <[email protected]> wrote: > Hi Mattis, > > I’m working with the disk image you provided. I see the failure on the > VAX750 simulator. > Have you tried earlier versions of Ultrix on the 750 simulator? > > I initially look at the crash message: > > sim> b rq0
In a similar vein, some months ago, I was trying to find why that wouldn't boot 4.3BSD on a Simh 11/730 RB730 disk and I got as far as tracing into BSD's driver rb.c since it was very early in the process that things went sideways. I wouldn't be surprised if these two UNIX boot failures were related - differences/assumptions in how drivers will treat controllers in VMS that don't apply to UNIX. > machine check 2: non-existant reference error > sumpar = 2 > va = 80001a90 > pc = 80087c61 > > I note that the PC mentioned is: 80087c61. > > If I do the following: > > sim> BRE 80087c61> > sim> SET CPU HISTORY=300 > sim> B RQ0 > > Execution flows up to the indicated address and if I single step from there, > the exception is taken. I at least had (still have) the source for 4.3BSD. I did narrow things down quite a bit, but then I ran off to learn more about how the disk controller works and haven't put any time into it for a few months. -ethan _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
