
========================
=  Mapper 057          =
========================

Example Games:
--------------------------
GK 47-in-1
6-in-1 (SuperGK)


Registers:
---------------------------

Range,Mask:   $8000-FFFF, $8800

  $8000:  [.H.. .AAA]
     H = High bit of CHR reg (bit 4)
     A = Low 3 bits of CHR Reg (OR with 'B' bits)

  $8800:  [PPPO MBBB]
     P = PRG Reg
     O = PRG Mode
     M = Mirroring (0=Vert, 1=Horz)
     B = Low 3 bits of CHR Reg (OR with 'A' bits)


CHR Setup:
---------------------------
'A' and 'B' bits combine with an OR to get the low 3 bits of the desired page, and the 'H' bit is the high
bit.  This 4-bit value selects an 8k page @ $0000


PRG Setup:
---------------------------

               $8000   $A000   $C000   $E000  
             +---------------+---------------+
PRG Mode 0:  |     $8800     |     $8800     |
             +-------------------------------+
PRG Mode 1:  |            <$8800>            |
             +-------------------------------+
