All versions of DOS I know require the use of a TSR (like FDAPM, or  
MS-DOS's POWER) to idle correctly, or of a program that does the idling  
itself (I don't know any COMMAND.COM version that does so). However, as  
the flawed call usually will simply be called by idle-unaware software, an  
idle-aware handler of the call could provide correct idling. This  
particularly means that DOS can fix incorrect applications, if they call  
DOS, and that the BIOS can fix DOS (because DOS always calls the BIOS) and  
all applications that call the BIOS. Though I have not yet seen a BIOS  
that idles correctly (even on recent boards!), there might be some that do.


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