INES Mapper 226

 Here are Disch's original notes:  
 ========================
 =  Mapper 226          =
 ========================
 
 Example Games:
 --------------------------
 76-in-1
 Super 42-in-1
 
 
 Registers:
 ---------------------------
 
 Range, Mask:  $8000-FFFF, $8001
 
   $8000:  [PMOP PPPP]
      P = Low 6 bits of PRG Reg
      M = Mirroring (0=Horz, 1=Vert)
      O = PRG Mode
 
   $8001:  [.... ...H]
      H = high bit of PRG
 
 
 PRG Setup:
 ---------------------------
 
 Low 6 bits of the PRG Reg come from $8000, high bit comes from $8001
 
 
                $8000   $A000   $C000   $E000  
              +-------------------------------+
 PRG Mode 0:  |             <Reg>             |
              +-------------------------------+
 PRG Mode 1:  |      Reg      |      Reg      |
              +---------------+---------------+