On , Carsten Wimmer wrote to David Noon :

CW> Hiya!
CW> 
CW>  DN>> I have found that INT 21H, function 1680H works in a VDM session,
CW>  DN> Of course, I meant to type INT 2FH.
CW> 
CW> int 2Fh func 1680h worked great under Warp 2.x and 3..  But
CW> under Warp 4 I get 100% cpu-load again, even with int 2Fh..
CW> Any ideas?
CW> 
CW> Cheers,
CW>    Carsten
    I ran across a tidbit in another echo long ago.  But here's what I
remember of it:

DOS box timeslice release.

xor dx, dx
mov ax, 0       ; number of milliseconds.  0 releases remaining timeslice.
hlt
db 35           ; following two data bytes tells OS/2 this is a timeslice
db CA           ; call.  The db 90 is a NOP instruction incase it's ran under
db 90           ; straight DOS to prevent lock-ups.

I've used the above in several programs.  It works just fine.

-Steve-

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