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The 6502 used in the NES was a second source version by Ricoh, a partial system on a chip, that lacked the binary-coded decimal mode but added 22 memory-mapped registers and on-die hardware for sound generation, joypad reading, and sprite list DMA.
PAL versions of the NES (sold in Europe, Asia, and Australia) use the Ricoh 2A07 or RP2A07 processor, which is a 2A03 with modifications to better suit the 50 Hz vertical refresh rate used in the PAL television standard. However, most developers lacked the resources to properly adjust their games' music from NTSC to PAL, leading to many PAL ...
They all use a custom "NES-on-a-chip" (NOAC) that is an implementation of the NES's hardware (Custom 6502, PPU, PAPU, etc.). The consoles came with 76 built-in games, although marketing frequently claims to have 1,000+ ways of playing them.
The methods by which the MPU state is preserved and restored within an ISR will vary with the different versions of the 65xx family. For NMOS processors (e.g., 6502, 6510, 8502, etc.), there can be only one method by which the accumulator and index registers are preserved, as only the accumulator can be pushed to and pulled from the stack. [5]
The Nintendo Entertainment System contained a modified 6502 but its cartridges sometimes contained a megabit or more of ROM, addressed via bank switching called a Multi-Memory Controller. Game Boy cartridges used a chip called MBC (Memory Bank Controller), which not only offered ROM bank switching, but also cartridge SRAM bank switching, and ...
The system resembles a Nintendo 64 controller and attaches to a TV set. NTSC, PAL and SECAM versions are available. They all use a custom "NES-on-a-chip" (NOAC) that is an implementation of the NES's hardware such as its custom 6502, PPU, and PAPU.
cc65 is a cross development package for 6502 and 65C02 targets, including a macro assembler, a C cross compiler, linker, librarian and several other tools. Overview [ edit ]
The NES uses a 72-pin design, as compared with 60 pins on the Famicom. To reduce costs and inventory, some early games released in North America are simply Famicom cartridges attached to an adapter to fit inside the NES hardware. [153] Early NES cartridges are held together with five small slotted screws. Games released after 1987 were ...