strange number corruption on pdp11/34

Jacob Ritorto jacob.ritorto at
Thu Jan 29 13:02:58 CST 2015

totally -- going to do just that.
 As soon as I (hopefully) find some pdp11 time this afternoon :)

On Thu, Jan 29, 2015 at 1:38 PM, Noel Chiappa <jnc at>

>     > From: Jacob Ritorto
>     > I just need quite a lot of hand holding because I'm still way too
> green
>     > with this stuff.
> Hey, that's what this list is for, right? ;-)
>     > put in the real numbers for address and csr for testing the drive ...
>     > I'm going to do that next, here. ... the reason it prompts a zero
>     > default is that it's a manifestation of the zero bug and that the
> real
>     > value *is* actually safe but hidden in memory?
> One other thing you could do that would be interesting: re-run the exact
> same test, but with the good cards in the machine, and see if you still
> get 0's printed, or if this time the correct numbers show up.
> Of course, that won't definitely prove that the right numbers are actually
> being used inside (in the case where it prints 0's), but it would
> certainly be
> suggestive.
>         Noel

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