From: bparkoff@gmail.com   
      
   The Apple II's video circuit outputs the picture signal to NTSC monitor. The   
   picture signal contains the binary data to be translated into 16 colors.   
   NTSC's chroma wheel has 8 hues and 4 phases.   
      
   How can degrees be determined from the group of 4 bits below?   
      
   Low Brightness   
   1000 = 0 degrees   
   0100 = 90 degrees   
   0010 = 180 degrees   
   0001 = 270 degrees   
      
   High Brightness   
   1101 = 0 degrees   
   1110 = 90 degrees   
   0111 = 180 degrees   
   1011 = 270 degrees   
      
   Medium Brightness   
   1100 = 45 degrees   
   0110 = 135 degrees   
   0011 = 225 degrees   
   1001 = 315 degrees   
      
   If I increase from group of 4 bits to group of 6 bits to support 64 colors   
   like Nintendo NES, the master OSC 21,477,270 MHz chip will be used for NTSC   
   monitor.   
      
   NTSC's chroma wheel has 12 hues and 6 phases.   
      
   How can group of 6 bits be interpreted into degrees? Please fill the degrees   
   when "? degrees" are shown in the bottom of group of 6 bits.   
      
   100000 = 0 degrees   
   010000 = 60 degrees   
   001000 = 120 degrees   
   000100 = 180 degrees   
   000010 = 240 degrees   
   000001 = 300 degrees   
      
   110000 = 30 degrees   
   011000 = 90 degrees   
   001100 = 150 degrees   
   000110 = 210 degrees   
   000011 = 270 degrees   
   100001 = 330 degrees   
      
   110001 = 0 degrees   
   111000 = 60 degrees   
   011100 = 120 degrees   
   001110 = 180 degrees   
   000111 = 240 degrees   
   100011 = 300 degrees   
      
   010001 = ? degrees   
   101000 = ? degrees   
   010100 = ? degrees   
   001010 = ? degrees   
   000101 = ? degrees   
   100010 = ? degrees   
      
   Thanks,   
   EB   
      
   --- SoupGate-Win32 v1.05   
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