XXDP on PDP-11/03

Brent Hilpert bhilpert at shaw.ca
Wed Aug 14 15:53:33 CDT 2019

On 2019-Aug-14, at 1:26 PM, Allison Parent via cctalk wrote:
> IPhoned it in!
>> On Aug 14, 2019, at 2:19 PM, Noel Chiappa via cctalk <cctalk at classiccmp.org> wrote:
>> From: Jonathan (systems_glitch)
>> Yep, fun times on LSI-11/2!
> Heh, this one was _utterly trivial_ compared to the 'must have working memory
> at 0 or ODT won't start'! (I don't think I've ever seen that one in DEC
> documentation anywhere...)
>   Noel
> ! Seriously?  
> The architecture of pdp-11 has
> the first 256 words as interrupt
> vectors and software locations.
> Memory of some form there is
> a must. How else would the console vectors at 60 work.

Well, the J11 ODT works fine with no memory.

I wouldn't have thought any of the (various 11 CPU) ODTs used interrupts for the console, and so wouldn't rely on the presence of vector memory.

Don't know which CPU Noel was referring to.

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