TNROM

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TNROM (HVC-TNROM) is one of the less common boards within the TxROM set. Like other TxROM boards, TNROM uses the Nintendo MMC3 ASIC. It should be noted that only Japanese HVC-TNROM boards have ever been produced, so this board has no 72-pin "NES-TNROM" counterpart.

Overview

  • PRG ROM size: 128, 256 or 512 KB (DIP-28/32 Nintendo pinout)
  • PRG ROM bank size: 8 KB
  • PRG RAM: 8 KB plus optionnal battery
  • CHR capacity: 8 KB RAM
  • CHR bank size: 1 KB and 2 KB
  • Nametable mirroring: Controlled by mapper
  • Subject to bus conflicts: No

Solder pad config

  • PRG RAM retaining data : 'SL' disconnected, Battery, D1, D2, R1 R2 and R3 present.
  • PRG RAM not retaining data : 'SL' connected, leave slots for Battery, D1, D2, R1, R2 and R3 free.

See also

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