Re: How many times must Apple make such DRASTIC architecture changes?

["Laine Houghton" <laine@intergate.com>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
96adnRRX4M_G8zXfRVn-rQ@comcast.com">news:96adnRRX4M_G8zXfRVn-rQ@comcast.com...
> Roy Smith wrote:
>> Paul Schlyter <pausch@NOSPAMsaaf.se> wrote:
>>
>>>But whenever that "4 GByte limit" becomes too limiting, it is possible to 
>>>start using different segments again. [...] don't expect this to happen 
>>>until more than 4 GBytes of RAM gets common.
>>
>>
>> If Moore's law holds, that only a couple of years away.  Today we're at 
>> the point where most desktops or laptops ship with at least 256 Meg, and 
>> it's not uncommon to find a Gig in a high-end personal machine.
>
> And we can expect that time to be accompanied by processors that
> can directly address 64-bit address spaces, with some fraction of
> the additional address lines implemented.
>
> -michael

Aren't OS's being written and tested on the IA-64 and AMD 64 at this moment?