INES Mapper 061: Difference between revisions

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(Add a CHR ROM variant.)
 
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[[Category:iNES Mappers|061]]
{{DEFAULTSORT:61}}[[Category:Multicart mappers]]'''iNES Mapper 61''', when using CHR ROM, denotes the NTDEC '''0324''' PCB, used for two ''HQ 高品質合卡 15-in-1'' multicarts. A compatible PCB with ID '''GS-2017''' mounts 8 KiB of unbanked CHR RAM instead, used for the ''方塊外傳 9合1 - Tetris Family 9-in-1'' and ''RCM 20-in-1'' multicarts.
  Here are Disch's original notes: 
==Address Latch ($8000-$FFFF, write)==
  ========================
  A~[1... CCCC M.pN PPPP]
  =  Mapper 061          =
        |||| | || ++++- PRG A18..A15
  ========================
        |||| | |+------ 0: PRG A14=CPU A14 (NROM-256)
 
        |||| | |        1: PRG A14=p (NROM-128)
  Example Game:
        |||| | +------- PRG A14 if M=1
  --------------------------
        |||| +--------- Mirroring, 0=Vertical, 1=Horizontal
  20-in-1
        ++++----------- CHR A16..A13 (when using CHR ROM)
 
 
  Registers:
  ---------------------------
 
    $8000-FFFF: A~[.... .... M.LO HHHH]
      H = High 4 bits of PRG Reg
      L = Low bit of PRG Reg
      O = PRG Mode
      M = Mirroring (0=Vert, 1=Horz)
 
 
  PRG Setup:
  ---------------------------
 
  PRG Reg is 5 bits -- combination of 'H' and 'L' bits.
 
                $8000  $A000  $C000  $E000 
              +-------------------------------+
  PRG Mode 0:  |           <$8000>            |
              +-------------------------------+
  PRG Mode 1|     $8000    |     $8000    |
              +---------------+---------------+

Latest revision as of 20:56, 23 June 2023

iNES Mapper 61, when using CHR ROM, denotes the NTDEC 0324 PCB, used for two HQ 高品質合卡 15-in-1 multicarts. A compatible PCB with ID GS-2017 mounts 8 KiB of unbanked CHR RAM instead, used for the 方塊外傳 9合1 - Tetris Family 9-in-1 and RCM 20-in-1 multicarts.

Address Latch ($8000-$FFFF, write)

A~[1... CCCC M.pN PPPP]
        |||| | || ++++- PRG A18..A15
        |||| | |+------ 0: PRG A14=CPU A14 (NROM-256)
        |||| | |        1: PRG A14=p (NROM-128)
        |||| | +------- PRG A14 if M=1
        |||| +--------- Mirroring, 0=Vertical, 1=Horizontal
        ++++----------- CHR A16..A13 (when using CHR ROM)