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Using Multiple CPU Cores in DOS? (Miscellaneous)

posted by bretjohn(R) Homepage E-mail, Rio Rancho, NM, 20.09.2011, 18:23

> A20 will be enabled by each INT 21, (usually DOS lives in memory above 1M),
> and left enabled.
> A20 is disabled when when a program is started.
> as most programs call int 21 sooner or later, A20 is reenabled again by int
> 21, and left enabled.
>
> therefore it's fast, almost all time.

I can see where somebody may want this as an option, but it definitely shouldn't be the default. This is potentially penalizing (performance-wise) the VAST majority of programs that work like they're supposed to, and catering to a few rare, buggy programs that have another option (LOADFIX) available to them anyway.

 

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