From: nowhere@never.at   
      
   On 13/11/2023 01:01, Robert Pengelly wrote:   
   > On Sunday, 12 November 2023 at 23:55:27 UTC, wolfgang kern wrote:   
   >> On 12/11/2023 23:14, Robert Pengelly wrote:   
   >> ...   
   >>> Also, how do I scale down a number in assembly?   
   >> SHR 3 ;aka divide by 8   
   >> SHR 4 ;aka divide by 16   
   >> both rounds down, but who cares?   
   >>   
   >> odd divide values can perform with a combination of SHR and MUL or even   
   >> with the famous awful slow DIV instruction.   
   >>   
   >> __   
   >> wolfgang   
   > So I was doing it right.  I have:   
   >   
   > xor     ax,     ax   
   >      xor     dx,     dx   
   >      xor     cx,     cx   
   >   
   >      mov     al,     [buffer]   
   >      and     al,     HEX (0C)   
   >   
   >      mov     dl,     [buffer]   
   >      and     dl,     HEX (03)   
   >   
   >      mov     cl,     4   
   >      shl     ax,     cl   
   >   
   >      mov     cl,     6   
   >      shl     dx,     cl   
   >   
   >      mov     cl,     [bx + 2]   
   >      or      ax,     cx   
   >      add     ax,     [mouse_y]   
   >   
   >      mov     cl,     4   
   >      shr     ax,     cl   
   >   
   >      mov     cl,     [bx + 1]   
   >      or      dx,     cx   
   >      add     dx,     [mouse_x]   
   >   
   >      mov     cl,     3   
   >      shr     dx,     cl   
   >   
   >      mov     [mouse_x],      dx   
   >      mov     [mouse_y],      ax   
   >   
   > but I'm getting weird results, am I shifting in the right place?   
      
   I'd keep mouse positions stored in pixels and only scale down for cursor   
   updates.   
   __   
   wolfgang   
      
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