INES Mapper 077

 Here are Disch's original notes:  
 ========================
 =  Mapper 077          =
 ========================
 
 
 Example Game:
 --------------------------
 Napoleon Senki
 
 
 Notes:
 ---------------------------
 This mapper has 4-screen mirroring!
 
 Also, it has 8k CHR-RAM in addition to any CHR-ROM present.
 
 I'm unsure whether or not this mapper suffers from bus conflicts.  Use caution!
 
 
 Registers:
 ---------------------------
 
   $8000-FFFF:  [CCCC PPPP]
     C = CHR Reg (2k @ $0000)
     P = PRG Reg (32k @ $8000)
 
 
 CHR Setup:
 ---------------------------
 
 CHR-RAM is fixed at $0800-$1FFF.  CHR-ROM is swappable at $0000:
 
       $0000   $0400   $0800   $0C00   $1000   $1400   $1800   $1C00 
     +---------------+---------------+---------------+---------------+
     |   $8000,ROM   |    {0},RAM    |    {1},RAM    |    {2},RAM    |
     +---------------+---------------+---------------+---------------+