-=> Quoting Mikko Hyvarinen to All <=- 

 MH> Interrupt 21h, register values:
 MH> AX = 6400h  ; OS/2 function interface
 MH> BX = 0032h  ; DosSleep API ordinal
 MH> CX = 636Ch  ; Magic number?

 MH> The other register values are missing. Using just these values with
 MH> zeros in all other registers results in error code 1. If somebody knows
 MH> what that is, please enlighten me.

There are a couple of examples in SNIPPETS (SNIP95??.ZIP) for giving up time
slices in DOS.  Here one of them (the other one is too large to post the
whole thing),

/** int drop_time(void)
**
**   Drops current timeslice in OS/2, Win, DPMI 1.0 and (I think) DV
**
**  Returns:  0 if not successful, 1 if dropped
**
**  Based on Ralf Brown's Interrupt list.
**  Donated to Public Domain by Thor Johnson.
**
***********************************************************************/

#include 
#include "snpdosys.h"

int drop_time(void)     /* Drops Time-slice, giving to another program */
{
      union REGS regs;

      regs.x.ax = 0x1680;
      int86(0x2f, ®s, ®s);
      return (regs.h.al == 0x80)? 0 : 1;
}

phil.crown{at}bluecafe.com
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