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base:demo_programming [2017-09-26 00:30] – [3D DOT SCROLL] ftcbase:demo_programming [2018-11-10 23:45] – [Horizontal Rastersplits] bepp
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 {{{{:base:rect11618.png?400| waiting for a rasterline}} {{{{:base:rect11618.png?400| waiting for a rasterline}}
  
-Dependent of which rasterline your currently in, you can simply compare $d012 with the desired rasterline or you must first wait for bit 7 of $d011 to attain the right value and then wait again for the desired line. Even more, retrace has to be taken into account, too.+Dependent of which rasterline you're currently in, you can simply compare $d012 with the desired rasterline or you must first wait for bit 7 of $d011 to attain the right value and then wait again for the desired line. Even more, retrace has to be taken into account, too.
  
-In total you have to consider 6 different cases. +In total you have to consider 6 different cases:
-you have to consider 6 different cases:+
  
-//beeing in rasterline 0-255 and//+//being in rasterline 0-255 and//
   * waiting for a rasterline < $d012 -> wait for bit 7 of $d011 to switch to 1 and back to 0 and then wait for lowbyte   * waiting for a rasterline < $d012 -> wait for bit 7 of $d011 to switch to 1 and back to 0 and then wait for lowbyte
   * waiting for rasterline > $d012 but < 256 -> simply wait on lowbyte to match   * waiting for rasterline > $d012 but < 256 -> simply wait on lowbyte to match
   * waiting for a rasterline > $d012 but > 255 -> wait for set bit 7 of $d011 and then wait for lowbyte to match   * waiting for a rasterline > $d012 but > 255 -> wait for set bit 7 of $d011 and then wait for lowbyte to match
-  *  + 
-//beeing in rasterline 256+ and//+//being in rasterline 256+ and//
   * waiting for a rasterline < $d012 and < 256 -> wait for unset bit 7 of $d011 and then wait for lowb   * waiting for a rasterline < $d012 and < 256 -> wait for unset bit 7 of $d011 and then wait for lowb
   * waiting for rasterline < $d012 but > 256 -> wait for unset bit 7 of $d011, then set bit7 of $d011 and then on lowbyte   * waiting for rasterline < $d012 but > 256 -> wait for unset bit 7 of $d011, then set bit7 of $d011 and then on lowbyte
base/demo_programming.txt · Last modified: 2022-03-15 19:00 by erhan