5 天之前 · The Nintendo MMC3 is a mapper ASIC used in Nintendo's TxROM Game Pak boards. Most common TxROM boards, along with the NES-HKROM board (which uses the Nintendo MMC6), are assigned to iNES Mapper 004. Some less common MMC3 boards required alternative iNES mapper implementations: This chip first appeared in the fourth quarter of 1988.

The MMC3 chip, soldered onto a PCB containing Super Mario Bros. 3 and others. Manufacturer: Nintendo; Games: Mega Man 3, 4, 5, 6, Super Mario Bros. 2 NA/EU, Super Mario Bros. 3, Kirby's Adventure, and more. The MMC3 was introduced in 1988.

2013年9月7日 · MMC3 can be used for 16K MMC1-style bankswitching, since it has two 8k pages that can be switched. It cannot do 32K bankswitching at all. MMC3 does let you use CHR-RAM, but you have to initialize the pages to map 0-7 over the 8K range.

2023年1月18日 · MMC1, MMC3: These mappers provide finely grained bank switching and features such as scanline counters. Their design involves an ASIC, which makes them more complicated and expensive than other mappers.

2019年11月11日 · At the bottom of MMC3_128_128.cfg, it defines some symbols, NES_MAPPER=4. And size of each ROM chip (NES_PRG_BANKS=8). MMC3 can be expanded to 512k PRG and 256k CHR, if you need.

2025年3月7日 · Those chips are fully compatible MMC3 clones that can be found in bootleg games (there might be minor differences like the PPU A12 edge on which the scanline counter is clocked). The connections to edge connector for single games are the same in both pirate and original version, although some pirate multicarts use those chips in non-standard ...

2021年5月7日 · The MMC3 is the most advanced of the most commonly used mappers, but it's really just a mapper that allows you to use larger PRG- and CHR-ROMs. Notably it has a scanline counter which allows you to do screen splits (raster effects) much easier than without it.

2021年1月27日 · The board can use an original MMC3 chip harvested from an NES game, and is also capable of using the SMD133 clone chip to imitate the MMC3 mapper (but its function hasn’t been thoroughly tested – your results will likely vary). Here is a table of the various TxROM boards and their required hardware.

MMC3. Nintendo's most popular mapper chip. It comes in MMC3A, B, and C revisions. The difference is probably something minor like process size. The MMC3 contains 8 registers. The chip uses A0, A13, A14, and A15 for decoding. Each register is …

MMC3 可谓是最开始几个Mapper中相当占分量的Mapper. MMC3是少数可以触发 IRQ 的Mapper之一. MMC6也是用同一个mapper编号, 内部逻辑大致相同. 目前实现到第一个测试的测试12: "RTI RTI不允许执行主线代码" ... 我™... 这些测试ROM就是搞事. four 1 KB banks at $1000-$1FFF; 1: two 2 KB banks at $1000-$1FFF, four 1 KB banks at $0000-$0FFF) MMC6 的M位是指是否使用PRG-RAM. +- Nametable mirroring (0: vertical; 1: horizontal) IRQ闩锁, 用于指定一个重载值.