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=  Mapper 243          =
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Example Games:
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Honey
Poker III 5-in-1


Registers:
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Range,Mask:   $4020-4FFF, $4101

  $4100:  [.... .AAA]   Address for use with $4101

  $4101:   Data port
     R:2 -> [.... ...H]  High bit of CHR reg
     R:4 -> [.... ...L]  Low bit of CHR reg
     R:5 -> [.... .PPP]  PRG reg  (32k @ $8000)
     R:6 -> [.... ..DD]  Middle bits of CHR reg
     R:7 -> [.... .MM.]  Mirroring
         %00 = Horz
         %01 = Vert
         %10 = See below
         %11 = 1ScB


Mirroring:
---------------------------

Mirroing mode %10 is not quite 1ScB:

  [  NTA  ][  NTB  ]
  [  NTB  ][  NTB  ]


CHR Setup:
---------------------------

8k CHR page @ $0000 is selected by the given 4 bit CHR page number ('HDDL')

