TVROM: Difference between revisions
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Revision as of 14:42, 12 June 2009
TVROM (NES-TVROM) is one of the less common boards within the TxROM set. Like other TxROM boards, TVROM uses the Nintendo MMC3 ASIC. It should be noted that most probably, only american NES-TVROM boards have ever been produced, so this board has likely no 60-pin "HVC-TVROM" counterpart.
Overview
- PRG ROM size: 64 KB (DIP-28 Nintendo pinout)
- PRG ROM bank size: 8 KB
- PRG RAM: None
- CHR capacity: 64 KB ROM (DIP-28 standard pinout)
- CHR bank size: 1 KB and 2 KB
- Nametable mirroring: Hardwired 4 screen mirroring
- Subject to bus conflicts: No
Hardware
For it's 4-screen mirroring, this boards uses a 8 KB SRAM chip, but only 4 KB is actually used, and the 2 KB VRAM inside of the console is always disabled.
