INES Mapper 058

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 Here are Disch's original notes:  
 ========================
 =  Mapper 058          =
 ========================
 
 Example Games:
 --------------------------
 68-in-1 (Game Star)
 
 
 Registers:
 ---------------------------
 
   $8000-FFFF:  A~[.... .... MOCC CPPP]
     P = PRG page select, also 8 KiB CHR page select in NROM-128 mode
     C = 8 KiB CHR page select in NROM-256 mode
     O = PRG Mode (0=NROM-256, 1=NROM-128)
     M = Mirroring (0=Vert, 1=Horz)
 
 
 PRG Setup:
 ---------------------------
 
                $8000   $A000   $C000   $E000  
              +-------------------------------+
 PRG Mode 0:  |            <$8000>            |
              +-------------------------------+
 PRG Mode 1:  |     $8000     |     $8000     |
              +---------------+---------------+