strange number corruption on pdp11/34

from which you booted?

From what I observed, this zeroed-out prompt was just another manifestation of the zeroes bug. The values were there in memory and were supposed to be offered to the user but got blanked out with zeroes instead. I had suspected this and just hit enter at the prompt and XXDP did, in fact, exercise the disk. There were blinking lights and head noise, obvious work being done that wouldn't have, had there actually been real zeroes in the address and csr fields. I might swap the bad cpu board back in and try again, but now that the problem has been isolated and removed, I'm inclined to just enjoy the pdp11 :) On Wed, Jan 28, 2015 at 10:19 PM, Rick Murphy <rick at rickmurphy.net> wrote: > At 07:34 PM 1/27/2015, Jacob Ritorto wrote: > >> Johnny, I just took the defaults, >> > >> BUS ADDRESS (O) 0 ? > > What Johnny said. The prompt says "(O)", not "(0)" - the letter O for > Octal. The zero after that isn't a default, it simply means that the value > hasn't been set. > > There is no default. Or at least no sane one. Zero in this case means that > it's writing to memory address zero for CSR. The diagnostic should reject > that, but diagnostics are notoriously user unfriendly. > -Rick > >