2021年6月23日 · Try looking at an FPGA NES project, it would have an implementation of the MMC3 as part of supporting mappers. Also make sure the author is okay with you using their Verilog code, check the software license, etc...

2025年3月8日 · 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.

2023年6月1日 · 要做 mapper 功能的 FPGA开发，需要明白mapper，board type，mmc的基本概念和功能。 mapper就是memory map。 为什么要memory map？ 因为红白机是8位机，16bit地址总线，CPU的最大访问空间是64K，CPU内存空间的一半0-0x7FFF作为寄存器等其他功能使用。 从0x8000-0xFFFF就是PRG-ROM空间了。 ROM大小是32KB。 一开始游戏比较小，这些空间够用，后来越来越大，怎么使用呢？ 任天堂就开发了 mmc 芯片（内存管理 控制）。 把ROM分成 …

2025年3月7日 · Note the orientation of the text: "MMC3" when viewed upright specifies pin 1 is bottom face, leftmost. As with several other ASIC mappers, parts of the pinout are often repurposed: Mappers 37 and 47 connect pins 42 and 30 to a 74161. In mapper 37, Pins 36, 38 (CPU D1, CPU D2) are additionally 74'161 D1, D2.

2005年1月3日 · MMC3 is really annoying to implement, because of the unclean PPU A12 that PowerPak provides. It's literally up to luck whether a certain revision of the mappers will work well or not, depending on how the logic is laid out. I'd suggest doing what the original MMC3 boards did, and add a 220 pf capacitor from ground to PPU A12 on the PowerPak.

2024年6月2日 · fpganes 是一个独特而有趣的开源项目，它将经典的任天堂娱乐系统（NES）移植到现场可编程门阵列（FPGA）上。 这个项目特别针对Xilinx的Nexys4开发板进行优化，旨在为玩家提供一种全新的复古游戏体验方式。 该项目的核心是利用Xilinx ISE工具链来实现FPGA设计。 FPGA是一种高度灵活的硬件，能够根据用户的配置重排其内部结构以执行特定功能。 在这个项目中，FPGA被用来复现NES的硬件逻辑，使得我们可以在现代的开发板上运行那些80年代的经 …

2024年11月4日 · With increased popularity of programmable logic devices (CPLD/FPGA), almost any mapper implementation can be done in just one chip with some additional components for: logic level translating (5 V from cart connector signal to 3.3 V), recovering !RESET signal from M2, protecting PRG-RAM against data corruption due to PRG-!CE and M2 delay,

2012年1月22日 · Generally, you'd want to avoid having two signals trigger a procedural block. Clocking a flip flop with a signal that is generated by logic in the FPGA instead of directly from an external clock or by the FPGA's PLL can also be wonky.

2017年9月12日 · mmc3最常见的是tlrom，但并不适合改造，因为mmc3的游戏很多是需要存档的。 而TKROM是带有电池记忆的，这样就可以通吃TLROM的游戏，反之则不行。 TKROM很好找，搜索 NESCartDB ，发现SD高达战记3和4就是符合条件的，并且价格也很便宜。

2021年5月30日 · Another option would be a FPGA style setup an Altera chip that basically clones the memory footprint and capabilities of the MMC5. I have a custom famicom cart here that had a full potential use MMC5 insane hack of Super Mario Bros 3 which turned it into Mario Allstars+mario bros arcade too.