strange number corruption on pdp11/34

Johnny Billquist bqt at
Thu Jan 29 07:48:03 CST 2015

On 2015-01-29 04:19, Rick Murphy 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.

Well, I would also look at the zero as the "default". Not a meaningful 
default, but it is what would be used if you just press enter.

> 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.

Right. :-)


More information about the cctalk mailing list