Hello Thomas,


 PR> mov   ax,0x1687

 TK>  Peter says in a message to me it is 0x1680, which is correct?

both... 
study the code I gave you. 0x1687 is the number you interrupt with to see
if a DPMI server is installed, intterupt with 0x1680 to release a
timeslice.

...the code I gave you works fine, feel free to use it un/modified or
however you wish.

BTW I learned this indirectly from Peter, so of course he's correct.

                                        Paul Rider.

--- Maximus/2 3.00