INES Mapper 077

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 ========================
 =  Mapper 077          =
 ========================
 
 Example Game:
 --------------------------
 Napoleon Senki
 
 
 Notes:
 ---------------------------
 This mapper uses an 8 KiB SRAM to provide both 6 KiB of CHR-RAM and
  four-screen mirroring.
 
 Registers: (** BUS CONFLICTS **)
 ---------------------------
 
   $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 $2000-$2400  $2800-$2C00
   +-----------+-----------+-----------+-----------+-----------+-------------+
   | $8000,ROM |  {1},RAM  |  {2},RAM  |  {3},RAM  |  {0},RAM  |Internal VRAM|
   +-----------+-----------+-----------+-----------+-----------+-------------+
 
 When making an emulator, you do not need to care about the specific order of
  the CHR-RAM banks: just provide 10KiB from $0800-$2FFF.