Harvard v. von Neumann

[Sridhar Ayengar]

Chuck Guzis wrote:
> On 12 Dec 2008 at 18:41, Sridhar Ayengar wrote:
> 
>> But, the data could only be operated on from the stack, right?  So, if 
>> you wanted to write a self-modifying program, wouldn't you need to have 
>> two entries in the PRT, similarly to what you've suggested, and then 
>> wouldn't you also need to push the elements of the array containing the 
>> program data onto the stack, operate on them, then pop them off the 
>> stack and back into the array space, thereby allowing the code to run?
>>
>> Or am I missing something?
> 
> I think we're saying the same thing.  In other words, code 
> modification was certainly possible.

But they threw up roadblocks to try to prevent it, right?  It sure looks 
like the array storage out-of-stack seemed to have been tacked onto the 
architecture as an afterthought.

Peace...  Sridhar