is None or == None ?

Chris Kaynor ckaynor at zindagigames.com
Tue Nov 10 17:32:55 CET 2009


On Tue, Nov 10, 2009 at 7:56 AM, Marco Mariani <marco at sferacarta.com> wrote:

> Grant Edwards wrote:
>
>  MacOS applications made the same mistake on the 68K.
>>
>
> And and awful lot of the Amiga software, with the same 24/32 bit CPU.
>
> I did it too, every pointer came with 8 free bits so why not use them?
>
>
>
>  It wasn't the decades-long global debacle that was the MS-DOS
>> memory model, but it did cause problems when CPUs came out that
>> implemented those address lines and RAM became cheap enough
>> that people needed to use them.
>>
>
> I suppose that's the reason many games didn't work on the 68020+
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

As a note, the official specification (Ihttp://
www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/24593.pdf),
the 64-bit pointers are required to be in canonical form for the exact
reason of helping prevent these mistakes from being repeated.

Chris
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