I did a port just like that (DTS Generic Unix) just to see what it would be 
like. It was awful. I’ll never do that again.

> On Nov 26, 2015, at 6:14 PM, Steve Simon <st...@quintile.net> wrote:
> 
> 
> I don't know about the PDP but the VAX allowed access to address zero.
> 
> Even more insidious, it allowed you to dereference a null pointer and 
> guaranteed it would contain a zero, which resulted in many tiresome 
> portability issues - I used Interdatas at the time, which faulted on a read 
> at address zero.
> 
> -Steve
> 
> 
> On 26 Nov 2015, at 17:48, Bakul Shah <ba...@bitblocks.com 
> <mailto:ba...@bitblocks.com>> wrote:
> 
>> Good points! Though 0 was a valid address on pdp11, right? 
>>>>>>  

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