From: "Tony Ingenoso" 

This still results in the CPU getting pegged when a DOS app runs.  Whoever
you hand off to is running, and the DOS app just swings to the back of the
scheduling line.  A yield isn't the same thing as a sleep, which DOS apps
do by burning CPU and watching the clock or BIOS countdown ticker.  What
you can get with the yield is better overall responsivness by not waiting
for the scheduler to preempt the DOS app.

"Mike '/m'"  wrote in message
news:stdefvgsbdippfmb1jfjj7rks0p4819n3l{at}4ax.com...
>
> There was an Int 0x21 call you could do that would yield the CPU to
> another process.   I used that call whenever I wrote a loop to wait for
> keyboard input.
>
>  /m

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