is None or == None ?

[Grant Edwards]

On 2009-11-10, 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?

TANSTAFB  ;)

I should probably add that MacOS itself used the same trick
until system 7.

>> 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+

Probably.  IIRC, it took a while for some vendors to come out
with "32-bit clean" versions of products.

http://en.wikipedia.org/wiki/Mac_OS_memory_management#32-bit_clean

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