Harvard v. von Neumann

[Sridhar Ayengar]

Chuck Guzis wrote:
>> According to my reading, the Burroughs B5000 and Manchester Atlas were 
>> both Harvard architecture machines, and the GE-645 was von Neumann.  Am 
>> I correct in my interpretation?
> 
> On the B5000, one certainly couldn't call the architecture strict 
> Harvard, I think it'd be a real stretch to call it modified Harvard.  
> While descriptors differentiated between code and data, these could 
> be altered under program control. I'd call it more of a protection 
> mechanism on a von Neumann machine, although that's even an 
> oversimplification.

What was the mechanism for transferring data between the stack and the 
program space?

Peace...  Sridhar