0x1A ( 26 )  Clip Window ULA/LoRes
  
BitsDescription
7:0Clip window coordinate (inclusive)*

* LoRes may get a separate clip window in the future

Notes:
  1st write = X1 position (soft reset = 0)
  2nd write = X2 position (soft reset = 255)
  3rd write = Y1 position (soft reset = 0)
  4rd write = Y2 position (soft reset = 191)
  Reads do not advance the clip position