Here's some explanation about the sinus table generator in the ACE BBS advert. The method used is a recursive sinus sythesis. It's possible to compute all sinus values with only the two previous ones and the value of cos(2ã/N) , where n is the number of values for one period. It's as follow: Sin(K)=2.Cos(2ã/N).Sin(K-1)-Sin(K-2) or Cos(K)=2.Cos(2ã/N).Cos(K-1)-Cos(K-2) The last one is easiest to use , because the two first values of the cos table are 1 & cos(2ã/n) and with this two values you are able to build all the following... Some simple code: the cos table has 1024 values & ranges from -2^24 to 2^24 build_table: lea DI,cos_table mov CX,1022 mov EBX,cos_table[4] mov EAX,EBX @@calc: imul EBX shrd EAX,EDX,23 sub EAX,[DI-8] stosd loop @@calc cos_table dd 16777216 ; 2^24 dd 16776900 ; 2 ^24*cos(2ã/1024) dd 1022 dup (?) Enjoy KarL/NoooN