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LinuxJunkie
join:2005-01-19
Cyberspace
| Re: Good; I'd like to try on my 64 bit Athlon lapt Why does it have to be emulated? AMD64 and EM64T (Intel's version of AMD64 extensions) both support 32-bit code natively. Also, Microsoft has developed the 64-bit version of Windows so it will also run 32-bit software (without emulation, to my understanding). MS removed all legacy 16-bit support but who cares? | |
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BA
The Old Man's Gonna Roll the Hard Six
Premium,MVM
join:2001-05-24
Vancouver, BC
clubs: 
| Re: Good; I'd like to try on my 64 bit Athlon lapt Using 32-bit apps isn't as transparent as they advertise - which is why the latest reviews on x64 Windows RC1 indicates there are small number of compatibility problems with existing apps. 32- and 64-bit code can't be used interchangeably. 32-bit apps need 32-bit DLL's and vice versa. For 32-bit apps, the OS uses the WoW64 compatibility mode which results in a (very?) small performance penalty. | |
| salahx
join:2001-12-03
Saint Louis, MO
| Back when Windows 95 was introduced, and there was a lot of 16-bit Windows 3.1 code. In order to allow the 16-bit to call 32-bit code (and vice-versa), Windows used a technique called "thunking". This was part fo a facility knowns as WOW (Windows on Windows). So the 32/64-bit issues will probably be dealt with the same way. | |
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Snickerdo
Premium
join:2001-02-28
Niagara Falls, ON
| Re: Good; I'd like to try on my 64 bit Athlon lapt said by salahx  :Back when Windows 95 was introduced, and there was a lot of 16-bit Windows 3.1 code. In order to allow the 16-bit to call 32-bit code (and vice-versa), Windows used a technique called "thunking". This was part fo a facility knowns as WOW (Windows on Windows). So the 32/64-bit issues will probably be dealt with the same way. That's exactly how 32/64-bit will be dealt with in Win64. While there is a penalty from the thunking, it is extremely low, something like less than 1% in most situations. Still, my A64 3200+ flies with 32-bit XP, I can't wait to try the RTM of XP64 with some real driver support. As it stands now, I can't boot off RAID with RC1.
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