Hi!
3-Янв-2005 19:20 [EMAIL PROTECTED] (Michael Devore) wrote to
[email protected]:
>>local_disable_a20:
>> mov ax,1
>> mov bl,0
>> retf
MD> Nothing on an application level should need to disable A20 and if it did,
MD> it would crash things loaded in a UMB due to loss of memory access, not to
--------------------------------------^^^ HMA ?
MD> mention DOS image loaded high going away. Most interrupts would
MD> immediately fail.
Why? They should fail only if they point into HMA and performed when
A20 is off.
>>(btw, what about xor bl,bl to save a memory transfer?)
MD> I'm not too interested in scattered small-scale code optimizations unless
There are _no_ optimizations.
MD> on my roadmap. May happen before March.
"May" == "can" or == "month May"? :) (Rhetoric questions, don't mind.)
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